An Iranian company holds no account in the United States and operates entirely under Iranian law; yet once one of its counterparties lands on a US sanctions list, European and Asian banks often step away from it too. That gap is what separates a "secondary sanction" from an ordinary domestic law, and it is what turns OFAC and the FATF into two institutions whose every decision and every meeting is a traceable event on the currency market's calendar.
What you will learn in this lesson
In this lesson you will learn how secondary sanctions differ from primary sanctions, how OFAC and its SDN List work, what a general license and a wind-down period mean, what the FATF is and why its "increased monitoring" list is not the same as its "call for action" list, and how to track these decisions the way you would track calendar events. This lesson is about institutional mechanics, not about the merits of any policy.
Definitions
- Primary sanction: a law that binds only US persons and companies, requiring them to refrain from dealing with a sanctioned target.
- Secondary sanction: a tool that does not directly bind a non-US person or firm, but exposes them to the risk of losing access to the US banking and dollar system if they conduct a significant transaction with a sanctioned entity.
- OFAC (Office of Foreign Assets Control): the branch of the US Treasury that compiles, updates and enforces sanctions lists.
- SDN List (Specially Designated Nationals and Blocked Persons List): the list OFAC publishes; being added to it means the person's assets under US jurisdiction are frozen.
- General license: a pre-defined exemption for a specific category of transactions, usable without applying case by case.
- Wind-down period: a specific window, sometimes issued alongside a new sanction or the revocation of a license, during which parties can unwind existing contracts without violating the law.
- FATF (Financial Action Task Force): an intergovernmental body headquartered in Paris and founded in 1989, which sets anti-money-laundering and counter-terrorism-financing standards and assesses countries' compliance with them; it is not itself a legislature or a court and does not directly impose sanctions.
- Increased-monitoring list: countries with deficiencies in their anti-money-laundering regimes that have committed to fixing them; commonly called the "grey list."
- High-risk jurisdictions subject to a call for action: a more serious tier, commonly called the "blacklist"; the FATF calls on members to apply countermeasures against these jurisdictions.
The mechanism: why these are calendar events
Both OFAC and the FATF work on an observable rhythm, not a sudden, unprecedented shock:
- An SDN List addition: every time OFAC designates a person or entity, it publishes an official, precisely dated notice. Some entries carry the phrase "Subject to Secondary Sanctions" next to the name: the exact label that warns non-US parties that dealing with that name carries secondary-sanctions risk.
- A general license alongside an action: when the scope of a sanction changes, OFAC sometimes issues a general license at the same time, keeping a narrow category of activity (personal communications, humanitarian aid) outside the sanction's reach.
- A wind-down period: if a license is revoked or an entity is newly sanctioned, a window of days to months is often announced for winding down existing deals; as that deadline approaches, counterparties' behavior changes.
- An FATF plenary meeting: the FATF holds plenary sessions during the year, and at the end of each one it reviews the increased-monitoring list and the call-for-action list; a country can enter either list, remain on it, or exit it.
The key point is that OFAC and the FATF are entirely separate institutions. OFAC sits inside the US Treasury and draws its authority from US law; the FATF is an intergovernmental body with no binding treaty and no court rulings of its own. But because banks worldwide factor its assessments into their own risk decisions, a country's staying on the call-for-action list keeps its wire-transfer costs and settlement times elevated, regardless of any separate US sanctions.
A worked example
In the SDN List update dated 28 August 2026, an individual linked to an Iranian bank was added to the list, carrying exactly this phrase: "Additional Sanctions Information - Subject to Secondary Sanctions." That single line is, on its own, an official warning to any non-US bank or exchange considering a transaction with that name. (Source: OFAC, US Department of the Treasury)
At the FATF level, at the plenary meeting of 17 to 19 June 2026, the list of high-risk jurisdictions subject to a call for action was reviewed; Iraq and Bosnia and Herzegovina were added to the increased-monitoring list, but Iran's status on the call-for-action list did not change. Iran has remained at that tier since February 2020, because most of the action plan it committed to in 2016, which expired in January 2018, still has not been fully implemented. (Source: Khabar Online, citing the FATF's latest public assessment, 19 August 2026)
Now a hypothetical example to see how a deadline works: suppose OFAC designates a crypto exchange on the SDN List on a Monday and simultaneously issues a forty-five-day general license to wind down existing transactions. In the days near the end of that window, the exchange's Iranian counterparties typically raise their demand for final settlement and conversion into cash dollars; that concentrated demand can put several days of temporary pressure on the free-market rate. Once the deadline passes, that urgent demand usually fades, because there is no legal transaction left to unwind. (This example is hypothetical, written to illustrate the mechanism, not to predict an actual date or rate.)
The transmission channel into Iran's market
Iran's currency traders follow this calendar not to guess at policy, but to estimate the timing of supply and demand pressure. An SDN List update can be published on any business day; FATF plenary meetings, by contrast, are announced in advance on the body's own calendar, and analysts assess the odds of a change in Iran's status ahead of each one. Because foreign banks factor a country's FATF risk into their fees and settlement terms, Iran's staying on or coming off the call-for-action list indirectly affects the cost of moving currency and the gap between the free-market dollar rate and official rates, an effect slower and quieter than a sanctions announcement, but more persistent.
Common mistakes
- Conflating the FATF list with US sanctions: these are two separate institutions with two separate logics; the FATF speaks to anti-money-laundering standards, OFAC to US legal jurisdiction.
- Assuming that passing a domestic law by itself means exiting the call-for-action list: the FATF distinguishes between "passing a law" and "effectively implementing it"; until it sees the standard actually enforced, a country's status does not change.
- Assuming a secondary sanction is a direct legal obligation on a non-US firm: a secondary sanction is economic leverage, not a court order binding that firm; the pressure travels through the risk of losing access to the dollar system.
- Assuming a general license means the sanction is lifted: a general license is a narrow, revocable exemption for one category of transactions, not a removal of the underlying sanction.
Summary
A primary sanction binds US persons; a secondary sanction threatens the rest of the world with losing access to the dollar system. OFAC's SDN List and its general licenses, and the FATF's increased-monitoring and call-for-action lists, each run on a trackable calendar rather than a random shock. Understanding that calendar is a tool for reading the timing of currency volatility, not for predicting the direction of policy.
The previous lesson in this series was "Why Did the Global Ounce Fall While the Coin Got More Expensive?". If you want to review the general mechanics of sanctions and their effect on the cost of moving currency from the ground up, "Sanctions Mechanics and Moving Money" is a good starting point. For the live dollar rate, see the dollar price page.
