U.S. Dollar Exchange Rate
Flagship chart, explicitly requested by project owner: official vs parallel/black-market rate plus computed premium %.
Event_Log
··1932Rial replaces qran as national currencyCorrelationExpected causation
Under the Unitary Currency Law of 1930-31, Bank Melli Iran assumes the monopoly on banknote issuance from the British-owned Imperial Bank of Persia (for a payment of £200,000), and the rial -- subdivided into 100 new dinars -- replaces the qran at par as Persia's official currency; Bank Melli's first banknotes (5, 10, 20, 100 and 500 rials) are issued starting April 1932.
Why this link: The 1930-31 Unitary Currency Law and Bank Melli's assumption of the note-issuing monopoly established the rial as Iran's sole legal-tender currency, the foundation of the exchange-rate regime this chart tracks from 1937 onward.
Caveat: Chart series begins five years after this event; the 1932-37 exchange history predates available data.
Lag: ~5 years to charted dataSource: Encyclopaedia Iranica -- Eskenas (Banknotes)··1944Bretton Woods Conference founds the IMF and World BankCorrelationExpected causation
Forty-four Allied nations agree to a new international monetary order: fixed-but-adjustable exchange rates pegged to a gold-backed dollar, and two new institutions, the IMF (balance-of-payments lending) and the World Bank (reconstruction and development finance), that become the primary external creditors and policy advisers for nearly every country in this database over the following eight decades.
Why this link: Bretton Woods established the fixed-but-adjustable, gold-backed-dollar exchange-rate system that Iran's rial operated within (as an original IMF member from December 1945) until the system's collapse in 1971, the institutional backdrop for this chart's earliest decades.
Caveat: This chart begins in 1937, before Bretton Woods, and Iran's own exchange controls and multiple-rate practices in this period were driven more by domestic fiscal needs than by the Bretton Woods rules themselves.
Lag: Institutional effect spans decades (1945-1971).Source: Federal Reserve History··1960Central Bank of Iran establishedCorrelationExpected causation
The Monetary and Banking Act of 7 Khordad 1339 (28 May 1960) creates Bank Markazi-e Iran, transferring central-banking functions -- currency issue, bank supervision, monetary policy -- from Bank Melli Iran to a dedicated central bank with initial capital of 3.6 billion rials.
Why this link: The Central Bank assumed exchange-rate management from Bank Melli, becoming the institution responsible for the official rate this chart tracks.
Caveat: Exchange-rate outcomes reflect many later policy choices, not the institutional handover alone.
··1960First IMF stand-by arrangement and stabilization programCorrelationExpected causation
Facing a balance-of-payments crisis after falling oil prices leave reserves covering barely one to two weeks of imports, Iran draws on a 35m-SDR IMF stand-by arrangement and adopts an austerity program that sharply curbs bank credit expansion and government spending through 1962.
Why this link: The balance-of-payments crisis and IMF-backed stabilization directly concerned defending the exchange rate this chart tracks.
Caveat: Exchange-rate behavior in this early period reflects many other factors beyond the single arrangement.
011971Nixon Shock — end of dollar-gold convertibilityCorrelationExpected causation
US suspends gold convertibility of the dollar, ending the Bretton Woods fixed exchange-rate system and ushering in the modern floating-rate era that every country in this database had to adapt to.
Why this link: The Nixon Shock ended dollar-gold convertibility and dissolved the Bretton Woods fixed-rate system, forcing Iran and every other country onto floating or adjustable exchange arrangements, the global regime shift that frames this chart's exchange-rate history from 1971 onward.
Caveat: Iran's own exchange-rate story, especially the official-versus-parallel gap after 1979, is driven far more by sanctions and domestic monetary policy than by the 1971 global regime change itself; Nixon Shock set the framework, not the specific gap dynamics.
Lag: Framework effect from 1971 onward.Source: Encyclopaedia Britannica··1973Yom Kippur War and 1973 oil embargoCorrelationExpected causation
Arab OPEC members embargo the US and allies; oil prices roughly quadruple, reshaping the fiscal trajectories of Iran, Saudi Arabia, and Venezuela alike (all oil exporters) and triggering stagflation in importer economies.
Why this link: The oil-boom-driven import surge and subsequent inflation of the mid-1970s built pressures on Iran's exchange-rate management that are part of the longer background to this chart's official-versus-parallel-rate history.
Caveat: The chart's most dramatic swings come from the 1979 revolution and post-1979 sanctions, decades later, so the 1973 shock is background context rather than a direct driver of the visible gap.
Lag: Indirect, background effect over several years.Source: Encyclopaedia Britannica021979US freezes Iranian assetsCorrelationExpected causation
Executive Order 12170 freezes roughly $12 billion in Iranian assets in the US following the embassy hostage crisis (Nov 4, 1979 – Jan 20, 1981).
Why this link: The freeze cut Iran off from roughly $12bn in foreign assets and heightened uncertainty around access to hard currency, feeding pressure on the exchange rate.
Caveat: A formal parallel/official rate gap only becomes clearly visible later; the immediate 1979-80 effect is hard to isolate from the broader hostage-crisis shock.
Lag: ImmediateSource: USIP Iran Primer — Timeline of U.S. Sanctions031979Second oil shockCorrelationExpected causation
Iranian Revolution disrupts oil supply; global prices roughly double 1979-1980, compounding stagflation in oil-importing economies and windfall revenue in exporters.
Why this link: The revolution and the oil-market turmoil around it triggered capital flight and the emergence of a large official-versus-parallel exchange-rate gap that marks the start of this chart's most volatile era.
Caveat: The exchange-rate gap widens further and more dramatically after the November 1979 hostage crisis and subsequent sanctions, so 1979 marks the start of a process rather than its full cause.
Lag: Onset in 1979, widening further over following years.Source: US Energy Information Administration··1980US trade embargoCorrelationExpected causation
United States severs diplomatic relations and imposes a full trade embargo on Iran.
Why this link: Severing diplomatic and trade ties with a major trading partner added to the currency pressures Iran faced in this period.
Caveat: This embargo occurred amid the hostage crisis and asset freeze, making its distinct currency effect hard to isolate.
Lag: ImmediateSource: USIP Iran Primer — Timeline of U.S. Sanctions041980Iran-Iraq War beginsCorrelationExpected causation
Eight-year war (1980-1988) imposes massive fiscal costs, disrupts oil exports, and entrenches a rationing/coupon system for basic goods.
Why this link: Wartime import needs, capital flight, and disrupted oil revenue widened the gap between the official and parallel-market exchange rate through the 1980s.
Caveat: Multiple exchange-rate regimes and price controls in this period make the parallel-market gap difficult to attribute to the war alone.
Lag: Immediate, 8-year spanSource: Encyclopaedia Britannica··1981Algiers Accords partially unfreeze Iranian assetsCorrelationExpected causation
The Algiers Accords end the 444-day hostage crisis: the US agrees to unblock roughly $7.9-8bn of the approximately $12bn in Iranian assets frozen in November 1979, transfers 50 tonnes of gold held at the New York Federal Reserve, and creates the Iran-US Claims Tribunal at The Hague, with Iran depositing $1bn+ in escrow to settle outstanding claims -- a major but only partial unwinding of the 1979 asset freeze.
Why this link: Partial unfreezing of assets and the resolution of the hostage crisis reduced some of the acute financial uncertainty pressing on the currency.
Caveat: The war, now four months old, remained the dominant pressure on the currency, overshadowing the accords' effect.
··1988Iran-Iraq War ends — ceasefire takes effectCorrelationExpected causation
Iran notifies the UN Secretary-General on 17-18 July 1988 that it accepts Security Council Resolution 598, after a deteriorating war economy and a string of Iraqi battlefield gains; the ceasefire takes effect at 3am on 20 August 1988 under UNIIMOG monitoring, ending eight years of war and opening the way for the Rafsanjani government's 1989 First Post-War Five-Year reconstruction plan.
Why this link: Reduced wartime uncertainty and the prospect of reconstruction-driven trade normalization eased some currency pressure after the ceasefire.
Caveat: Multiple exchange-rate regimes persisted into the 1990s, and the parallel-market gap remained wide for years after the ceasefire.
Lag: 1-3 yearsSource: Encyclopaedia Britannica051993External debt crisis forces payment moratoriumCorrelationExpected causation
After the postwar reconstruction boom's heavy short-term borrowing (foreign debt reaching roughly $28bn) collides with weaker oil prices, the Central Bank effectively halts most external debt-service payments and new borrowing dries up; imports are cut nearly in half in 1994 and external debt peaks at 36.2% of GDP in March 1994, ending the postwar boom.
Why this link: The debt crisis forced a sharp rial devaluation and widened the gap between the official and free-market exchange rates within the same year.
Caveat: The failed March 1993 unification attempt itself is a more direct and proximate cause of this specific currency movement.
061993Exchange-rate unification attemptCorrelationExpected causation
Rafsanjani government attempts to unify Iran's multiple-tier exchange rate system; the effort partially unwinds after reserve pressure.
Why this link: This policy attempted to merge the official and parallel exchange rates directly; its collapse within months, amid the debt crisis, is a direct documented event on this exact series.
Caveat: The attempt failed quickly enough that the resulting series movement blends the unification policy with the debt crisis that undid it.
Lag: Same yearSource: IMF Iran country page (Article IV history)··1995US bans Iranian petroleum-development dealsCorrelationExpected causation
Executive Order 12957 declares a national emergency with respect to Iran and prohibits US persons from financing, managing or supervising the development of Iranian petroleum resources, a narrower precursor to the comprehensive US trade and investment ban imposed two months later (Executive Order 12959, 6 May 1995).
Why this link: The ban added to the broader climate of sanctions-related uncertainty pressing on the currency in the mid-1990s.
Caveat: The far broader comprehensive trade ban imposed two months later dominates the currency effect of this narrower petroleum-specific order.
··1995US comprehensive trade and investment banCorrelationExpected causation
Executive Order 12959 bars virtually all US trade and investment with Iran.
Why this link: The comprehensive ban deepened Iran's international economic isolation, adding to pressure on the currency's parallel-market value.
Caveat: Domestic monetary and fiscal policy remained the dominant drivers of the exchange-rate gap through the 1990s.
Lag: 1-2 yearsSource: OFAC — Iran Sanctions Program Information072002Official/market exchange-rate unificationCorrelationExpected causation
Iran unifies its official and market exchange rates at the start of the 1381 fiscal year, a rare successful unification episode.
Why this link: This successful reform directly merged the official and free-market exchange rates, closing the gap this exact series tracks, unlike the failed 1993 attempt.
Caveat: A managed float with periodic Central Bank intervention persisted afterward, so the unified rate did not mean a fully free float.
Lag: Same yearSource: IMF Iran country page (Article IV history)0820032000s commodity super-cycleCorrelationExpected causation
China's post-2001 WTO-driven infrastructure boom, alongside strong global growth, drives the IMF commodity price index up roughly fourfold between January 2000 and mid-2008; crude oil rises from about $30/barrel in 2003 to a record $147/barrel on 11 July 2008, delivering a sustained fiscal windfall to every oil exporter in this database (Iran, Saudi Arabia, Venezuela, Russia) before the Global Financial Crisis abruptly ends the cycle.
Why this link: The oil-price boom produced Iran's largest current-account surpluses of the post-revolutionary era, since oil exports dominate the trade balance.
Caveat: Import demand also surged alongside oil revenue, partially offsetting the surplus in some years.
Lag: Same year.Source: US Energy Information Administration··2006UNSC Resolution 1696 demands enrichment suspensionCorrelationExpected causation
The Security Council adopts Resolution 1696 (14-1, Qatar opposed), invoking Chapter VII Article 40 to demand Iran suspend all uranium-enrichment-related and reprocessing activities by 31 August 2006 or face the prospect of economic and diplomatic sanctions under Article 41; Iran does not comply, and the Council follows through with its first actual sanctions resolution (1737) that December.
Why this link: The resolution marked the start of an escalating UN sanctions track that fed into growing currency-market uncertainty over the following years.
Caveat: The immediate 2006 currency effect of this specific resolution alone is modest compared to later, more severe sanctions rounds.
Lag: Multi-year, cumulativeSource: United Nations -- Security Council Press Release SC/8792 (Resolution 1696)··2006First UN Security Council sanctionsCorrelationExpected causation
UNSC Resolution 1737 imposes the first multilateral sanctions over Iran's nuclear program, targeting proliferation-sensitive trade and assets.
Why this link: The first binding UN sanctions marked an escalation that added to risk premia pressing on the rial's parallel-market value.
Caveat: Domestic monetary policy and rapidly growing oil revenue in this period were larger drivers of currency dynamics than this initial sanctions round.
Lag: Multi-year, cumulativeSource: Wikipedia — International sanctions against Iran (cross-check chronology skeleton)··2007UNSC Resolution 1747 expands arms embargoCorrelationExpected causation
Resolution 1747 bans Iran from exporting any arms or related materiel, calls on states and international financial institutions not to enter new grants, financial assistance or concessional loans with the Iranian government except for humanitarian or developmental purposes, and freezes the assets of 28 additional individuals and entities linked to Iran's nuclear and missile programs.
Why this link: The continuing escalation of UN sanctions resolutions, including this one, added incrementally to risk perceptions affecting the currency.
Caveat: This specific resolution's marginal, standalone effect on the exchange-rate gap is very difficult to isolate from the broader multi-year sanctions trajectory.
Lag: Multi-year, cumulativeSource: United Nations -- Security Council Press Release SC/8980 (Resolution 1747)··2008UNSC Resolution 1803 tightens bank and cargo vigilanceCorrelationExpected causation
Resolution 1803 (14-0, Indonesia abstaining) calls on states to inspect, where reasonable grounds exist, the cargo of aircraft and vessels owned or operated by Iran Air Cargo and the Islamic Republic of Iran Shipping Line, and to exercise vigilance over transactions with all Iranian banks -- naming Bank Melli and Bank Saderat specifically -- to prevent financial flows linked to proliferation-sensitive nuclear activities.
Why this link: One of a lengthening sequence of UN sanctions resolutions that raised the risk premium on Iranian bank transactions, nudging the parallel-market dollar rate up even before the harsher 2010-2012 measures.
Caveat: Effect is small and hard to separate from ordinary market noise; the resolution mainly signaled vigilance rather than blocking transactions outright.
092008Global Financial Crisis — Lehman Brothers collapseCorrelationExpected causation
Triggers a synchronized global recession; oil prices crash from ~$147 to ~$40/barrel within months, hitting every oil exporter in this database simultaneously, while credit-driven European economies (Spain, Portugal, Greece) enter prolonged crises.
Why this link: The current-account surplus, dominated by oil exports, contracted sharply as export revenue collapsed with the oil price.
Caveat: Import compression in response to the shock also affected the balance, partly offsetting the export-side drop.
Lag: Same to next year.Source: Federal Reserve History··2010UNSC Resolution 1929CorrelationExpected causation
Expanded UN sanctions targeting Iran's financial sector, arms trade, and Revolutionary Guard-linked entities.
Why this link: Expanded UN sanctions on Iran's financial sector and arms trade widened the wedge between the official and parallel-market dollar rate as banks grew more cautious about Iran-linked transactions.
Caveat: Effect is layered on top of prior and subsequent resolutions, making the incremental contribution of this specific resolution hard to isolate.
Lag: Weeks to monthsSource: USIP Iran Primer — Timeline of U.S. Sanctions··2010CISADA expands US sanctions on fuel and financial sectorsCorrelationExpected causation
President Obama signs the Comprehensive Iran Sanctions, Accountability, and Divestment Act (passed 408-8 House, 99-0 Senate), which targets firms supplying Iran with gasoline or refined petroleum products or supporting its domestic refining capacity -- aimed at Iran's reliance on imported gasoline despite being a crude exporter -- and mandates sanctions on foreign banks that knowingly facilitate significant transactions with the IRGC or its affiliates.
Why this link: CISADA's threat of secondary sanctions on foreign financial institutions dealing with Iran raised counterparty risk and widened the parallel-market FX premium ahead of the sharper 2011-2012 currency crisis.
Caveat: The rial had not yet entered its acute crisis phase in 2010, so the FX effect here is a moderate build-up rather than a sharp break.
102011NDAA Section 1245 targets Central Bank of IranCorrelationExpected causation
Section 1245 of the FY2012 National Defense Authorization Act requires blocking the US-jurisdiction property of Iranian financial institutions including the Central Bank of Iran (CBI), and threatens foreign banks that knowingly conduct significant CBI transactions with loss of direct access to the US financial system -- a major escalation targeting Iran's oil-revenue payment channels that helps trigger the rial's collapse the following year.
Why this link: Threatening foreign banks with loss of US market access for significant CBI transactions struck directly at the channel Iran used to repatriate oil revenue, triggering the rial's slide toward its 2012 collapse.
Caveat: This measure combined with the EU oil embargo and SWIFT disconnection weeks later, so its standalone contribution to the rial's fall cannot be fully isolated.
112012EU decides Iranian oil embargoCorrelationExpected causation
EU Council Decision 2012/35/CFSP bans imports of Iranian crude oil and petroleum products and freezes Central Bank of Iran assets, with a transition period allowing existing contracts to wind down through 1 July 2012.
Why this link: Loss of oil-export dollar inflows from the EU embargo was a direct driver of the FX shortage that produced the 2012 rial collapse in the following months.
Caveat: Combined with CBI sanctions and SWIFT disconnection, so the rial's fall cannot be attributed to the oil embargo alone.
122012SWIFT disconnection and oil-export sanctionsCorrelationExpected causation
Major Iranian banks cut off from SWIFT messaging; US NDAA sanctions target foreign purchasers of Iranian oil, triggering a sharp rial depreciation through 2012-13.
Why this link: Cutting sanctioned Iranian banks off from the SWIFT messaging system severed the main channel for settling foreign trade, a direct and well-documented trigger of the acute FX shortage that year.
Caveat: Occurred in the same window as the EU oil embargo and CBI sanctions, making the individual contribution of the SWIFT cut hard to isolate from the combined package.
132012SWIFT disconnects sanctioned Iranian banksCorrelationExpected causation
Following the EU Council decision, SWIFT announces it will terminate financial-messaging services to roughly 30 EU-sanctioned Iranian banks effective 17 March 2012, cutting them off from the primary channel for international interbank payments.
Why this link: This is the specific SWIFT disconnection event most directly credited by analysts with triggering the acute dollar shortage behind the 2012 rial crisis.
Caveat: Occurred essentially simultaneously with the EU embargo taking hold, so the two are difficult to disentangle empirically.
Lag: WeeksSource: SWIFT -- Press Release142012Rial collapses amid sanctions squeezeCorrelationExpected causation
Under the combined weight of NDAA Central Bank sanctions, the EU oil embargo and the SWIFT disconnection, Iran's free-market rial loses roughly a quarter to 40% of its value against the US dollar within a single week, falling to about 35,000-40,000 rials/dollar versus roughly 10,000/dollar two years earlier; Tehran's Grand Bazaar merchants strike in protest on 3 October 2012.
Why this link: This is the event itself: the rial lost roughly two-thirds of its parallel-market value within days, the single sharpest break in Iran's exchange-rate history and exactly what this chart records.
Caveat: None; this is a direct, first-order description of the chart's own subject.
··20142014-2016 oil price collapseCorrelationExpected causation
Oil prices fall from ~$115 to below $30/barrel amid US shale supply growth and OPEC's decision not to cut output; a major driver of Venezuela's and Russia's subsequent crises, and a fiscal shock for Saudi Arabia and Iran.
Why this link: Falling oil revenue tightened the central bank's hard-currency supply, adding pressure to the parallel-market rial premium through this period.
Caveat: Domestic monetary policy and sanctions-related banking restrictions are larger, more direct drivers of the exchange-rate gap than the oil price alone.
Lag: 6-12 months.Source: US Energy Information Administration··2015JCPOA signedCorrelationExpected causation
Iran and the P5+1 sign the Joint Comprehensive Plan of Action, exchanging nuclear program limits for sanctions relief.
Why this link: Signature of the nuclear deal, ahead of actual sanctions relief, improved market expectations and narrowed the official-parallel FX gap in anticipation of Implementation Day.
Caveat: This is an anticipation effect on expectations, not the actual sanctions relief, which only arrived with Implementation Day six months later.
Lag: Weeks to monthsSource: Arms Control Association — JCPOA at a Glance152015Iran nuclear deal (JCPOA) signedCorrelationExpected causation
Iran and the P5+1 finalize the Joint Comprehensive Plan of Action in Vienna, exchanging nuclear-program limits for the lifting of UN, EU and US nuclear-related sanctions; roughly $100bn in frozen Iranian assets are released after IAEA-verified implementation begins in January 2016.
Why this link: Sanctions relief and renewed access to foreign-exchange reserves narrowed the official-parallel rial gap through 2016-17, before it widened again as the deal came under strain.
Caveat: Domestic inflation and money-supply growth continued to pressure the rial even during this relief window, limiting how much the gap could close.
Lag: Within 1 year.Source: European External Action Service162016JCPOA Implementation DayCorrelationExpected causation
IAEA certifies Iranian compliance; US, EU and UN lift nuclear-related sanctions on oil, banking, shipping and other sectors, unlocking roughly $56bn of previously frozen assets.
Why this link: Sanctions relief and the unfreezing of overseas assets directly eased the dollar shortage, narrowing the parallel-market premium in 2016.
Caveat: Domestic monetary conditions and continued residual sanctions on some sectors kept the gap from closing fully.
172018Rouhani unifies exchange rate, bans free-market tradingCorrelationExpected causation
Facing rial depreciation ahead of the expected US JCPOA withdrawal, the government sets a single official rate of 42,000 rials/dollar and Vice President Jahangiri declares unauthorized currency trading equivalent to smuggling, subject to judiciary and security-force enforcement; the unified rate proves unsustainable and the black-market rate reaches roughly 70,000/dollar within a month.
Why this link: This is a direct policy intervention in the exact variable the chart tracks: fixing a single official rate and outlawing free-market currency trading, which instead drove the black-market premium sharply wider.
Caveat: The policy's outcome was the opposite of its stated intent, so while attribution is high the direction reflects the unintended consequence of the ban, not a successful unification.
Lag: Immediate to monthsSource: Bourse & Bazaar Foundation182018NIMA secondary forex market launchedCorrelationExpected causation
The Central Bank launches the NIMA (Forex Management Integrated System) electronic platform, requiring exporters to sell foreign-currency earnings through registered exchange houses to importers of non-essential goods at a market-linked rate distinct from the official and open-market rates -- formalizing Iran's return to a multi-tier exchange-rate system just weeks after the failed April 2018 rate unification.
Why this link: NIMA created a formal secondary-market rate distinct from the fixed official rate, institutionalizing the multi-tier FX system whose widening gaps this chart tracks for the following years.
Caveat: NIMA operated alongside an unofficial free market that persisted despite the ban, so the observed FX gap reflects both the NIMA rate structure and continued informal trading.
Lag: Immediate to monthsSource: Atlantic Council -- Iran's Economy and the Burden of Multiple Exchange Rates192018US withdraws from JCPOACorrelationExpected causation
President Trump announces US withdrawal from the JCPOA and reimposition of sanctions after 90/180-day wind-down periods (effective Aug 7 and Nov 5, 2018).
Why this link: The US exit and announced return of sanctions was a direct and immediate shock to FX markets, sending the rial into a fresh, sustained slide through 2018.
Caveat: Domestic FX mismanagement (the failed April 2018 unification) was already destabilizing the rial before this announcement, so the two shocks compound.
Lag: Immediate to monthsSource: Wikipedia — US withdrawal from the JCPOA (cross-check against OFAC primary orders)202018First snapback sanctions take effectCorrelationExpected causation
Executive Order 13846 reimposes sanctions on Iran's automotive sector, precious-metals trade, and rial-denominated transactions.
Why this link: This first snapback tranche, covering autos, metals, and currency transactions, reinforced the rial's ongoing 2018 slide begun by the withdrawal announcement three months earlier.
Caveat: By this date the FX shock was already well underway from the May withdrawal announcement, so this tranche is a reinforcing rather than an originating cause.
Lag: Weeks to monthsSource: OFAC — May 2018 Guidance on Reimposing Sanctions212018Second snapback: oil and banking sanctionsCorrelationExpected causation
Remaining JCPOA-lifted sanctions on oil exports, shipping, and the Central Bank of Iran come back into full effect, driving a sharp rial crash through late 2018.
Why this link: Renewed oil and banking sanctions reduced dollar inflows and kept pressure on the rial's parallel-market rate through late 2018 and into 2019.
Caveat: By this point the rial had already depreciated sharply since May 2018, so this tranche mainly sustained rather than newly triggered the FX pressure.
Lag: Weeks to monthsSource: OFAC — Sanctions reimposition guidance··2019FATF blacklists IranCorrelationExpected causation
Financial Action Task Force places Iran on its blacklist over anti-money-laundering/counter-terror-financing standards, adding friction to remaining international banking channels.
Why this link: As one more institutional escalation reinforcing Iran's financial isolation, the blacklisting added modestly to sentiment pressuring the parallel-market rate in mid-2019.
Caveat: The rial's level in mid-2019 was already dominated by the oil-waiver removal two months earlier; FATF's own incremental effect is minor by comparison.
Lag: Weeks to monthsSource: Financial Action Task Force··2020Tehran Stock Exchange bubble peaks then burstsCorrelationExpected causation
Encouraged by the government to invest amid rial depreciation and sanctions, retail investors pour over $900m into the Tehran Stock Exchange; the main index peaks above 2 million points on 9 August 2020 before crashing roughly 40% over the following months, wiping out many small investors' savings and triggering public anger at perceived market manipulation.
Why this link: Retail investors were partly drawn into equities as a rial-depreciation hedge, linking the stock bubble loosely to parallel-market currency dynamics.
Caveat: The causal direction runs both ways and is heavily confounded with sanctions and monetary conditions; too diffuse to isolate on the FX series itself.
Lag: concurrentSource: Radio Farda (RFE/RL Persian Service)222020Rial breaches 300,000/dollar on free marketCorrelationExpected causation
Amid 'maximum pressure' sanctions, curtailed oil exports and pandemic-driven economic strain, Iran's open-market rial weakens past 300,000 rials/dollar for the first time -- roughly a 90% depreciation from pre-2018-sanctions levels -- deepening import-cost inflation.
Why this link: This event is itself the data point: the rial's open-market rate crossing 300,000/dollar for the first time, directly recorded on the exchange-rate series.
Caveat: None beyond normal exchange-rate data-source variance between reporting services.
Lag: immediateSource: Bloomberg··2021Iran-China 25-Year Cooperation Program signedCorrelationExpected causation
Foreign ministers Zarif and Wang Yi sign a strategic partnership framework committing China to invest in Iranian energy, transport, banking and telecoms infrastructure over 25 years -- reportedly up to $400bn, though independent analysts dispute the figure -- in exchange for steady, discounted Iranian oil supply, part of Tehran's 'Look East' hedge against Western sanctions.
Why this link: As a symbolic strategic-partnership signal offering Iran an alternative trade and investment relationship amid sanctions, the announcement briefly featured in rial sentiment coverage.
Caveat: Independent analysts dispute the headline $400bn figure and little concrete investment has been verified to have followed; the actual economic effect on any Iranian data series is unproven and likely minimal.
Lag: unclear/largely unrealizedSource: Axios232022Preferential "4,200 toman" import-currency rate eliminatedCorrelationExpected causation
Parliament approves ending the subsidized foreign-currency allocation for essential imports (flour, medicine), removing the ~$10-14bn/yr subsidy and roughly doubling bread prices for many bakeries.
Why this link: Eliminating the subsidized 4,200-toman rate for essential imports is a direct step toward exchange-rate unification, closing part of the gap between the preferential and market rates that this chart tracks.
Caveat: The reform removed only one of several preferential/multiple-rate mechanisms; the full official-parallel gap continued to be shaped by other allocations and sanctions pressure.
Lag: immediate on policy dateSource: Bourse & Bazaar Foundation242022Mahsa Amini protestsCorrelationExpected causation
Death of Mahsa Amini in morality-police custody triggers months of nationwide unrest, disrupting business activity and accelerating rial depreciation.
Why this link: Business disruption and political-risk premia during the unrest accelerated rial depreciation on the free market, as widely reported at the time.
Caveat: This period overlaps with ongoing sanctions pressure and pre-existing depreciation trends, so the protest-specific increment in the rial's decline cannot be precisely isolated.
Lag: days to weeksSource: Encyclopaedia Britannica··2022Fastest Federal Reserve tightening cycle since the 1980sCorrelationExpected causation
The Fed raises its policy rate by 5.25 percentage points between March 2022 and July 2023 to fight post-pandemic inflation, its most aggressive tightening since the early 1980s; the resulting dollar strength and capital outflows push several emerging-market currencies in this database down more than 15% in 2022 alone, including the Turkish lira and Argentine peso.
Why this link: Dollar strength from the Fed's aggressive tightening added a modest layer of pressure on the rial's parallel-market rate during 2022-23, on top of the dominant sanctions- and liquidity-driven depreciation already underway.
Caveat: Sanctions and domestic monetary expansion are overwhelmingly the larger drivers of rial depreciation in this period; the Fed's role is a secondary, global-dollar-strength channel that is hard to isolate.
Lag: Months.Source: Federal Reserve Bank of Dallas··2024Iran formally joins BRICSCorrelationExpected causation
Iran's membership in the BRICS economic bloc (alongside Egypt, Ethiopia, and the UAE) takes effect 1 January 2024 after being invited in August 2023; Tehran frames membership as a hedge against Western economic isolation.
Why this link: Formal BRICS membership is a national-scale institutional realignment explicitly framed by Tehran as a hedge against Western economic isolation, relevant context for any account of Iran's exchange-rate and trade trajectory.
Caveat: No concrete, measurable channel (local-currency trade settlement, new investment flows) had materialized by the data available; the effect on the exchange rate is speculative at this stage.
Lag: unclear, likely multi-year if anySource: Tehran Times (state-media-attributed; accession date cross-checked against Atlantic Council and Stimson Center coverage)··2024President Raisi dies in helicopter crashCorrelationExpected causation
President Ebrahim Raisi's death triggers a snap presidential election; markets and the rial reacted to the political uncertainty.
Why this link: The sudden death of a sitting president and resulting political uncertainty triggered a documented reaction in rial trading on the free market.
Caveat: The market move was short-lived and layered on pre-existing depreciation pressure from sanctions, making the event's specific increment hard to isolate precisely.
Lag: daysSource: Encyclopaedia Britannica··2024Pezeshkian elected presidentCorrelationExpected causation
Reformist-aligned Masoud Pezeshkian wins the presidential runoff on a platform including negotiating sanctions relief.
Why this link: A reformist-aligned president elected on a platform including sanctions-relief negotiations shifted market expectations, with a documented rial reaction around the runoff.
Caveat: Any sanctions-relief negotiation outcome remained highly uncertain at the time of election, so the rial's reaction reflects expectations rather than a realized policy change, and later diverged as talks stalled.
Lag: days around electionSource: Encyclopaedia Britannica252025Israel-Iran Twelve-Day WarCorrelationExpected causation
Israel launches Operation Rising Lion, striking Iranian nuclear and military sites from 13 to 24 June 2025; Iran's oil exports fall to roughly 102,000 bbl/day mid-war, a refinery near Tehran and part of the South Pars gas field are damaged, and the rial depreciates sharply through the following weeks.
Why this link: The war directly and sharply depreciated the rial on the free market through the strike period and following week, as documented in real time.
Caveat: The rial had already been on a depreciating trend from sanctions pressure; the war's specific incremental depreciation, while large, sits on top of that baseline trend.
Lag: immediateSource: Al Jazeera262025UN snapback sanctions reimposedCorrelationExpected causation
After the E3 (France, Germany, UK) trigger the JCPOA's snapback mechanism on 28 August 2025 citing Iranian non-compliance, the 30-day countdown lapses and UN Security Council sanctions under Resolutions 1696-1929 (arms embargo and proliferation-related financial and trade restrictions) are reinstated on 27-28 September 2025.
Why this link: Reinstatement of UN Security Council financial and trade restrictions raises transaction and counterparty risk for anyone dealing in rials, a channel that typically widens the parallel-market gap.
Caveat: UN snapback sanctions add to, rather than replace, an already extensive US sanctions regime already priced into the rial, so the marginal effect of this specific reimposition is hard to isolate.
Lag: days to weeksSource: U.S. Department of State272025Currency redenomination law passedCorrelationExpected causation
Parliament approves a law removing four zeros from the rial (10,000 old rials = 1 new rial) and introducing a subunit called the qeran; the Central Bank has two years to set implementation procedures, followed by a three-year dual-circulation transition, amid roughly 40% inflation and a rial that has lost over 90% of its value since 2018 sanctions reimposition.
Why this link: Removing four zeros from the rial is a direct, national-scale legislative response to the currency's collapse; any reader of the exchange-rate chart needs this law to understand the redenomination context for later data.
Caveat: Implementation is scheduled over a multi-year transition (up to two years for procedures, then three years of dual circulation), so the law itself does not move the exchange-rate series; it only relabels it eventually. It responds to inflation and depreciation rather than causing further movement.
Lag: multi-year implementation aheadSource: Iran International
Related_Laws
Laws related to this measure. Correlation = how closely this law tracks this measure's story. Expected causation = how strongly we would expect it to have moved the line. Neither is a claim of proof.
0CorrelationExpected causationCircular of the Trade Promotion Organization of Iran on Changes to the Exchange Rate Used as the Basis for Calculating Import Duties
Issued in 2025, this circular updates the exchange rate that customs uses as the base for calculating import duties on goods entering Iran, following a related cabinet resolution.
Why this link: The circular references and applies an official exchange rate for customs purposes, illustrating how Iran's multi-tier FX regime feeds into trade administration even though it does not itself set the market rate.
Caveat: This is a downstream administrative application of an exchange rate set elsewhere by the Central Bank, not a driver of the rate itself.
Lag: Immediate.1944CorrelationExpected causationBylaw Concerning Coupons and Rationing Booklets
Regulates the use of coupons and rationing booklets for distributing rationed goods.
Why this link: The 1944 rationing bylaw (coupons and ration booklets) was a direct wartime price/quantity-control instrument on staple goods; the scarcity and controls it codified are part of the same wartime economy that produced a wide official/parallel exchange-rate gap in this period.
Caveat: Wartime shortage, Allied occupation logistics, and grain requisitioning were the primary drivers of the FX and price distortions of the 1940s; this specific rationing bylaw is one codified piece of a much larger wartime control regime.
Lag: Effect concurrent with wartime implementation, 1944 onward.1950CorrelationExpected causationAmendment of Certain Provisions of the Foreign Exchange Bylaw
Why this link: A 1950 amendment to the foreign-exchange implementing bylaw, part of the postwar FX-allocation control regime that shaped how the rial traded against foreign currencies.
Caveat: A narrow bylaw amendment within a much larger, frequently-revised FX control apparatus; its isolated effect on the rate cannot be separated from the wider regime.
Lag: Immediate administrative effect, price effects diffuse and unmeasurable at this granularity.1958CorrelationExpected causationAct on the Transfer of Foreign Exchange Transactions to Bank Melli Iran
Passed in 1958, this law places all purchase, sale, and transfer of foreign currency under the supervision of Bank Melli Iran, requiring exporters to surrender their export foreign-exchange proceeds to authorized banks and giving Bank Melli authority to license authorized banks and issue foreign-exchange regulations.
Why this link: This 1958 law transferred all foreign-exchange transactions to Bank Melli Iran, establishing the foundational state-controlled exchange-rate regime under which Iran's official FX rate was set for decades.
Caveat: The official-versus-parallel exchange-rate gap the chart tracks reflects many later policy layers (multiple exchange rates, sanctions, subsidized rates) built on top of this 1958 foundation, so the law's own standalone effect on the modern gap is indirect and cannot be isolated.
Lag: Structural, multi-decade effect; not a short-run channel.1960CorrelationExpected causationSupreme Court Unified Procedure Ruling No. 3067 ... on Any Action Taken to Export Gold from the Country
This Supreme Court ruling addresses the treatment of any action taken to export gold from the country.
Why this link: A 1960 Supreme Court unified ruling on penalties for gold export, part of the era's capital-control apparatus that also governed FX outflows.
Caveat: A judicial enforcement ruling, not a rate-setting instrument; its effect on the exchange-rate series cannot be isolated from the broader capital-control regime.
Lag: Immediate legal effect; economic effect diffuse.1985CorrelationExpected causationForeign Exchange Budget Act for 1985-86 (1364)
Passed in 1985, this law authorizes the government to allocate up to 15 billion dollars of the country's foreign currency earnings for that year, setting up a Currency Allocation Committee to prioritize hard-currency spending across sectors including basic goods, electricity, gas injection and private-sector raw material imports.
Why this link: This is a dedicated foreign-exchange budget law from the Iran-Iraq war economy, allocating scarce hard currency across multiple official exchange rates for different categories of imports; it is a direct instrument shaping the gap between official and parallel-market dollar rates in this period.
Caveat: The parallel-market premium in this era was also driven heavily by wartime import scarcity and capital flight expectations beyond the formal multiple-rate allocation.
Lag: Contemporaneous.1989CorrelationExpected causationBylaw on Opening Documentary Letters of Credit under Article 62 of the Public Accounts Act
This bylaw governs the opening of documentary letters of credit as provided in article 62 of the Public Accounts Act.
Why this link: 1989 bylaw on opening documentary letters of credit under Article 62 of the Public Accounting Law, a procedural rule for how state-sector purchases are financed and settled abroad; touches import execution and the demand for allocated foreign exchange for government imports.
Caveat: Only a small share of total imports and FX demand flows through this specific state-procurement channel; it cannot be isolated from the much larger private-sector trade and multi-tier exchange-rate regime.
Lag: Short lag; LC opening rules affect the timing of import settlement within months.1993CorrelationExpected causationNational Budget Act for 1372
Passed in 1993 (1372 SH), this law enacts Iran's national budget, setting the government's revenue and expenditure appropriations for that fiscal year.
Why this link: The 1372 budget law was passed alongside the government's March 1993 unification of the official exchange rate (a single rate replacing the multi-tier system), a policy that briefly narrowed and then, after the rate proved unsustainable later that year, widened again the official-versus-parallel exchange-rate gap this chart tracks.
Caveat: The exchange-rate unification was a separate central-bank/government decision, not a clause of the budget law itself, though the two were closely coordinated as part of the same 1372 fiscal-year policy package.
Lag: Same fiscal year1994CorrelationExpected causationRules for Determining the Foreign Currency Needed by Officials Dispatched Abroad
These rules set out how to determine the foreign currency allowance for officials sent abroad on missions.
Why this link: 1994 rules fixing the foreign-currency allocation for Iranian government officials traveling abroad, one small piece of the multi-tier FX-rationing regime that produced large gaps between official and parallel exchange rates in the 1990s.
Caveat: This allocation covers a trivial share of total FX demand and does not itself move the exchange rate; it is included as an illustration of the rationing regime's mechanics, not as a driver of the rate gap.
Lag: Immediate administrative effect, negligible macro lag.1996CorrelationExpected causationRegulation on the Use of Foreign Exchange Earned from Goods Exports by Exporters
Issued in 1996 by the market-regulation task force, this decision allowed exporters to use a specified 30 or 50 percent portion of their export foreign-exchange earnings to directly import goods under a Commerce Ministry permit, with the Commerce Ministry setting the eligible import list.
Why this link: This 1996 decision let exporters use 30-50% of their retained foreign-exchange earnings to directly import goods under Trade Ministry authorization, a real incentive mechanism that tied export performance to import access during a period of foreign-exchange scarcity and multiple exchange rates.
Caveat: The scheme is one of many FX-retention and multiple-rate mechanisms Iran used across the 1990s; isolating its specific contribution to export volumes or the exchange-rate gap from the broader FX regime is not possible.
Lag: Applied immediately to new export proceeds after mid-1996.1998CorrelationExpected causationDirective on the Settlement of Foreign-Currency Debts of Executive Agencies
Sets out procedures for government executive agencies to settle their foreign-currency debts.
Why this link: This 1998 directive settling the foreign-exchange debts of government executive agencies is a direct instrument acting on Iran's external debt stock and, through demand for hard currency to clear those debts, on the exchange-rate gap.
Caveat: This settles a specific stock of legacy debt from executive agencies; it is one of many FX-liability actions in the late-1990s post-war debt-rescheduling period and cannot be isolated from broader FX policy.
Lag: Effect on debt stock near-immediate; FX-market effect within the same fiscal year.2000CorrelationExpected causationExecutive Bylaw of the Act on Government Discretionary Punishments for Goods and Currency Smuggling
Issued in 2000, this bylaw implements the 1995 Government Discretionary Punishments (Ta'zirat) Act for smuggling, defining agencies such as the "discovering agency" and setting procedures for revenue bodies like customs and the central bank to pursue and penalize smugglers, including confidential rewards for informants.
Why this link: 2000 executive regulation implementing the law on government sanctions for smuggling of goods and currency, setting up the enforcement mechanism against the black-market movement of foreign exchange, a direct channel affecting the gap between official and parallel exchange rates.
Caveat: Enforcement intensity varied greatly over the decades this regulation remained in force, and the official/parallel exchange-rate gap is driven mainly by sanctions, monetary policy and expectations, so the regulation's own marginal effect cannot be isolated.
2001CorrelationExpected causationInterpretive Act Regarding Articles 1 and 13 of the Export and Import Regulations Act Adopted in 1372 (1993/94)
This law provides an authoritative interpretation of Articles 1 and 13 of the Export and Import Regulations Act adopted in 1372 (1993/94).
Why this link: This 2001 interpretive law clarifies that non-oil exporters' foreign-exchange repatriation commitments made before the 1993 Export/Import Regulations Act remain governed by the rules in force when pledged, resolving legal uncertainty over FX-surrender obligations that shaped exporters' incentives during the 1990s multiple-exchange-rate era.
Caveat: This is a narrow legal clarification about which of two overlapping rule sets applies to older FX pledges, not a change in policy; its effect on exchange-rate dynamics or export values is not separable from the far larger multiple-exchange-rate and sanctions regime of the period.
Lag: immediate legal effect, economic effect diffuse2002CorrelationExpected causationAct Amending the 1381 (2002) Foreign Exchange Ceiling in Table 2 of the Third Economic, Social and Cultural Development Plan Act
Passed on 14 Bahman 1380 (2002), this act revises the 1381 hard-currency spending ceiling under the Third Development Plan to 14.9 billion dollars (12.8 billion from oil revenue and 2.1 billion from the Oil Stabilization Fund), and lets the government draw further on the Fund to offset losses arising from exchange-rate unification.
Why this link: Amends the foreign-exchange ceiling table set under the Third Development Plan budget, a direct instrument governing how much FX the state allocates at official versus market-linked rates.
Caveat: The official/parallel exchange-rate gap over this period is dominated by the broader 2002 FX-unification reform; this specific ceiling-table amendment is one implementing detail within it.
Lag: Short-term; ceiling-table changes affect the official/allocated exchange rate within the same budget year.2002CorrelationExpected causationRuling No. 208 of the General Board of the Administrative Court of Justice, Dated 1377/09/06, National Iranian Oil Products Distribution Company
This ruling by the Administrative Justice Court's General Board concerns a directive dated 1377/09/06 issued by the National Iranian Oil Products Distribution Company.
Why this link: This ruling annulled National Iranian Oil Products Distribution Company circulars that required aviation fuel sold to Iranian airlines be billed in US dollars, on the ground that under the Monetary and Banking Act debts must be settled in rial unless FX regulations provide otherwise, directly engaging Iran's rial-versus-dollar dual-pricing question.
Caveat: A narrow sectoral pricing dispute limited to aviation fuel; it did not alter Iran's exchange-rate policy or the official-parallel gap, and its effect cannot be seen in the aggregate FX series.
Lag: immediate (administrative), no measurable FX effect2002CorrelationExpected causationBylaw on Facilities for, and the Manner of, Converting Non-Governmental Electricity Producers' Revenue into Foreign Currency
Passed by the cabinet on 10 Shahrivar 1381 (2002), this bylaw allows the Ministry of Energy to sign power-purchase agreements with private and cooperative generators, and requires the Central Bank to convert part of these producers' rial revenue into foreign currency at the market exchange rate to help them service their foreign-currency obligations.
Why this link: As an FX-allocation mechanism specific to one sector, it forms part of the broader patchwork of preferential and multiple exchange-rate arrangements reflected in the gap between official and parallel-market rates.
Caveat: This is one narrow sectoral facility among many multiple-exchange-rate mechanisms and cannot be isolated as a driver of the official-parallel gap itself.
Lag: Contemporaneous with shifts in FX policy.2003CorrelationExpected causationDecree No. 36113/T27538H Dated 30 ... on Government Discretionary Punishments (Ta'zirat) Concerning the Smuggling of Goods and Currency
A cabinet decree concerning government discretionary punishments (ta'zirat) for the smuggling of goods and currency; the source title and date are truncated in the original record.
Why this link: Sets discretionary punishments (Ta'zirat) for goods and currency smuggling, a direct enforcement instrument against black-market currency and trade flows that feed the parallel exchange-rate gap and official trade statistics.
Caveat: Enforcement decrees have historically had limited, hard-to-measure deterrent effect relative to the scale of sanctions-driven smuggling; the gap and trade totals are dominated by larger macro forces.
Lag: Short-term.2003CorrelationExpected causationAct Amending the 1382 (2003) Foreign Exchange Ceiling in the Third Economic, Social and Cultural Development Plan Act of the Islamic Republic of Iran
Passed on 18 Dey 1381 (2003), this act sets the 1382 hard-currency spending ceiling under the Third Development Plan at 15.438 billion dollars and authorizes the government to draw up to 2.5 billion dollars from the Oil Stabilization Fund to cover losses from exchange-rate unification and repay maturing foreign-currency loans.
Why this link: This 2003 amendment raises the Third Plan's 1382 (2003/04) foreign-exchange ceiling to $15.438bn and authorizes drawing on the Oil Reserve Account to cover the government's FX-unification-related debt to the Central Bank, tying the budget-year FX envelope to Iran's exchange-rate management during the 2002-03 unification period.
Caveat: This sets a budget-year ceiling and reserve-account drawdown rule, not the exchange rate itself; the rial's actual official/parallel path is driven far more by oil revenue, sanctions and Central Bank policy than by this single annual ceiling law.
Lag: within the 1382 (2003/04) budget year2004CorrelationExpected causationAmendment to Articles 30 and 31 of the Executive Bylaw ... on Discretionary Punishments Concerning the Smuggling of Goods and Currency
This decree amends Articles 30 and 31 of the executive bylaw on government discretionary punishments for smuggling goods and currency.
Why this link: Amends procedural articles of the bylaw implementing discretionary punishments for smuggling of goods and currency, part of the enforcement apparatus against unofficial trade and capital flight.
Caveat: A narrow procedural amendment to two articles; smuggling volumes are driven far more by the exchange-rate gap and sanctions than by this enforcement tweak, so its own effect on recorded trade or FX series cannot be isolated.
Lag: Enforcement effects, if any, would show within the same fiscal year.2008CorrelationExpected causationAddition of Text as a Note to Item 4(b) [...] Rules Governing the Granting of Foreign Currency Facilities and Agency Contracts
This act adds a note to item 4(b) of the rules governing the granting of foreign currency facilities and agency contracts.
Why this link: A narrow 2008 addendum to the rules on granting foreign-currency credit facilities and bank agency contracts tweaks how FX-denominated loans are administered, part of the broader regulatory plumbing around the FX market.
Caveat: This is a technical clause addition, not a change to the exchange-rate regime itself; its effect on the rate or the official-parallel gap cannot be isolated.
Lag: Immediate on bank practice; no measurable lag on the exchange rate itself.2013CorrelationExpected causationAnti-Smuggling of Goods and Currency Act
Passed in 2013, this law is Iran's principal anti-smuggling statute, defining goods and currency smuggling, establishing specialized courts and enforcement task forces, and setting penalties such as confiscation and fines, with a share of recovered funds paid as rewards to whistleblowers and enforcement agencies.
Why this link: The Law to Combat Smuggling of Goods and Currency (2013) is Iran's principal legal instrument against informal-market currency trading and unlicensed goods movement, both of which are driven by, and feed back into, the gap between the official and parallel-market exchange rates.
Caveat: The FX gap is driven overwhelmingly by macro fundamentals (sanctions, inflation differentials, multiple official rates); enforcement under this law can at most narrow the gap at the margin and its effect is hard to isolate from these larger forces.
2016CorrelationExpected causationExecutive Bylaw of Articles 5 and 6 of the Anti-Smuggling of Goods and Currency Act
Approved in 1395 (2016) to implement Articles 5 and 6 of the Anti-Smuggling of Goods and Currency Act, this bylaw creates a network of integrated electronic systems, including a comprehensive trade system, a customs single window, a currency-tracking system, and transport and warehouse databases, to detect and prevent smuggling of goods and foreign currency.
Why this link: This bylaw implements Articles 5 and 6 of the Anti-Smuggling of Goods and Currency Law, targeting illicit currency trafficking that is a direct driver of the gap between official and parallel-market exchange rates.
Caveat: The official-parallel exchange rate gap is driven mainly by macro instability, sanctions, and inflation expectations; enforcement effects of a single anti-smuggling bylaw cannot be isolated from these dominant drivers.
Lag: Any enforcement effect would be short-lived and localized around enforcement campaigns.2016CorrelationExpected causationExecutive Bylaw of Article 27 of the Anti-Smuggling of Goods and Currency Act
This bylaw implements Article 27 of the law combating the smuggling of goods and currency.
Why this link: Implementing bylaw for Article 27 of the Anti-Smuggling of Goods and Currency Law, targeting currency and goods smuggling that thrives on the gap between official and parallel exchange rates and distorts recorded trade flows.
Caveat: Enforcement effectiveness against smuggling is hard to observe directly; the FX gap and trade-flow data are driven far more by sanctions intensity and official exchange-rate policy than by this specific enforcement bylaw.
Lag: Medium term2017CorrelationExpected causationAmendment to Article 4 of the Executive Bylaw of the Note to Article 77 of the Act on Combating the Smuggling of Goods and Currency
Amends article 4 of the executive bylaw implementing the note to article 77 of the Act on Combating the Smuggling of Goods and Currency.
Why this link: Amends the executive bylaw for combating currency and goods smuggling under Note to Article 77 of the Anti-Smuggling Law, a direct enforcement lever against the black-market currency trade that drives the gap between official and parallel exchange rates.
Caveat: The parallel-market gap is driven mainly by sanctions, monetary policy, and expectations; enforcement bylaws have historically had only a modest, temporary dampening effect on smuggling volumes.
Lag: Short-term, months.2017CorrelationExpected causationAmendment to Article 5 of the Executive Bylaw of Articles 5 and 6 of the Anti-Smuggling of Goods and Currency Act
This decree amends Article 5 of the bylaw implementing Articles 5 and 6 of the law combating the smuggling of goods and currency.
Why this link: This 2017 amendment orders the Central Bank, together with the Ministry of Industry and customs, to build and operate a currency-tracking system under the 2015 Anti-Smuggling of Goods and Currency Law, part of the state's effort to formalize FX flows and narrow the gap between official and informal exchange rates.
Caveat: The official-parallel FX gap is driven overwhelmingly by sanctions, monetary policy and expectations; a single tracking-system amendment cannot be credited with moving it.
Lag: System build-out took years after the underlying 2015 law.2019CorrelationExpected causationRuling No. 2620 of the General Board of the Court of Administrative Justice, on the Central Bank Circular of 1397/5/20 (Dated 1397/5/27)
Issued on 1398/9/5 (late 2019) by the General Board of the Court of Administrative Justice, it annulled a 2018 Central Bank circular that retroactively required importers to settle the outstanding balance of already-opened letters of credit at the secondary-market (NIMA) exchange rate instead of the originally agreed preferential rate, ruling the retroactive application unlawful.
Why this link: A 2019 ruling on a Central Bank circular governing which exchange rate (subsidized 42,000-rial rate vs. NIMA secondary-market rate) importers must use to settle the remaining balance on documentary-credit-financed imports, a direct channel through which the multi-tier FX regime raised effective import costs during the post-2018 sanctions currency crisis.
Caveat: This is one adjudicated dispute over one circular clause; the broader FX-gap and import series are driven mainly by sanctions, oil-revenue shocks, and overall monetary policy, not this single ruling.
2019CorrelationExpected causationRuling No. 67 of the General Board of the Administrative Court of Justice Annulling the Tax Administration's Circular on Withholding Tax on Interest and Fees Paid to Foreign Investors and Banks for Loans and Financial Facilities
Issued in 2019, this ruling annulled a tax circular that had required Iranian companies to withhold tax on interest and fees paid to foreign banks with no branch or agency in Iran for loans and credit facilities, holding that only income earned in Iran through a permanent presence is taxable under the Direct Taxes Act.
Why this link: A 2019 ruling on foreign-currency charges applied to extended credit facilities/loans, another instance of multi-tier FX-rate costs being passed through to borrowers, the phenomenon the official-vs-parallel FX gap series tracks.
Caveat: This narrow adjudicated case cannot be isolated as a driver of the aggregate FX-gap series, which is dominated by sanctions and macro/monetary policy.
2019CorrelationExpected causationRuling No. 2895 of the General Board of the Administrative Justice Court on the Application of Article 91 of the Administrative Justice Court Act (1392) to Ruling No. 432 (1396/05/10) and the Non-Annulment of Tax Affairs Organization Circular No. 9253 (1390/07/09)
Issued in 1398 (2019), this ruling of the Administrative Justice Court's General Board overturns its own earlier decision and holds that health insurance and supplementary health insurance services are not covered by the Value Added Tax Act's exemption for medical services, so insurers must charge VAT on these premiums.
Why this link: A 2019 ruling on foreign-exchange rate differentials applied to financial facilities/loans, an instance of the multi-tier exchange-rate system's cost effects on credit that the official-vs-parallel FX gap series records.
Caveat: A single adjudicated loan-facility dispute cannot be isolated as a driver of the aggregate official-parallel FX gap, which is dominated by sanctions and macro policy.
2025CorrelationExpected causationNational Budget Act for Year 1404 (Part One): Ceiling of General Government Resources and Resource/Expenditure Assumptions
Approved 1403/11/08 (early 2025) by the Islamic Consultative Assembly, this first part of the 1404 annual budget act sets the overall ceiling on the government's general resources and expenditures and lays out the revenue and spending assumptions (tax revenue, oil revenue, borrowing, and public-sector spending targets) that frame the rest of the annual budget act.
Why this link: Iranian budget laws typically set or reference an official exchange rate for government transactions and oil-revenue conversion, one of the administrative anchors behind the gap between the official and parallel-market dollar rates.
Caveat: The parallel-market gap is driven mainly by sanctions, monetary expansion and expectations; the budget's official rate is only one administrative input among several.
Lag: Contemporaneous.2025CorrelationExpected causationCircular of Iran's Trade Development Organization Regarding ... Changes to the Exchange Rate Basis for Calculating Import Duties
Issued in 2025, this circular forwards Cabinet Resolution No. 6609/T63777H to Iran's customs offices, updating the 2025 tariff schedule and the commercial-profit tax brackets to match a revised exchange rate used to calculate import duties.
Why this link: This 2025 decree sets which exchange rate (official, NIMA, or another benchmark) is used to value imported goods for customs-duty assessment, a direct link to the exchange-rate regime this chart tracks.
Caveat: This decree changes how the exchange rate is applied to customs valuation; it does not itself set or move the market exchange-rate gap, which is driven by sanctions, monetary policy and expectations.
Lag: Immediate on customs valuation.