Executive Order 12170 (1979)

Executive Order 12170 (1979) is the United States executive order issued by President Jimmy Carter on 14 November 1979 that blocked all property of the Government of Iran, including the Central Bank of Iran, within US jurisdiction or in the possession of US persons, in response to the seizure of the US embassy in Tehran ten days earlier. It was the first major use of the International Emergency Economic Powers Act and an important early model for later IEEPA blocking programmes.

Provisions and procedure

The order declared a national emergency with respect to Iran and blocked Iranian state property under the International Emergency Economic Powers Act (1977), the successor authority Congress had carved out of the Trading with the Enemy Act only two years earlier; IEEPA's first serious test came almost immediately. Implementation fell to the Treasury's Office of Foreign Assets Control (United States) through the Iranian Assets Control Regulations. Critically, the blocking reached Iranian deposits held at overseas branches of US banks, an extraterritorial extension that alarmed European depositors and central banks and opened the still-running argument about the dollar system's political reliability.

Employment history

Official estimates varied with date and asset category. A November 1979 Treasury memorandum put the market value then blocked substantially above USD 8 billion; later US government accounts describe more than USD 12 billion in Iranian property blocked during the 1979-1981 programme. The freeze became a central bargaining asset of the hostage crisis. Its unwinding was negotiated through Algeria and executed in January 1981 through the Algiers Accords: specified assets were transferred through an agreed structure, and disputed claims were routed to the Iran-United States Claims Tribunal at The Hague. In Dames & Moore v Regan (1981), the Supreme Court upheld the challenged suspension of claims and asset-transfer arrangements in their specific statutory and historical setting. The decision did not recognise an unlimited presidential power to dispose of blocked assets. The episode is treated in full at United States freeze of Iranian government assets during the hostage crisis (1979-1981).

Effects

EO 12170 established a durable IEEPA pattern: emergency declaration, comprehensive blocking of state property, negotiation over the blocked pool and a settlement implemented through licences and asset transfers. Contemporary US reporting recorded concern among allies and some reserve holders about the security of dollar assets, an early instance of the backlash dynamic treated at De-dollarisation as backlash dynamic. The order itself was never fully revoked; the Iran emergency declared in November 1979 has been renewed annually ever since. Later Iran sanctions programmes rest on additional statutes and executive orders and must not be described as consequences of EO 12170 alone. The episode nevertheless remains an important comparator for the Afghan reserve freeze and the Coalition immobilisation of Central Bank of Russia reserves (2022-present).

The legal position remained live on 30 July 2026. A notice signed on 5 November 2025 continued this distinct 1979 national emergency through 14 November 2026. It must not be merged with the separate Iran emergency declared in 1995. The Algiers settlement transferred specified assets and claims into a negotiated structure, but did not erase the distinction between the original freeze, later asset transfers and subsequent Iran sanctions programmes.

See also

United States freeze of Iranian government assets during the hostage crisis (1979-1981) · International Emergency Economic Powers Act (1977) · Asset freeze · Central-bank reserve immobilisation · Central Bank of Iran · Coalition immobilisation of Central Bank of Russia reserves (2022-present) · Sovereign immunity of central bank assets · Financial warfare · Economic statecraft

Sources

• Executive Order 12170, accessed 30 July 2026.
• 2025 continuation of the 1979 Iran emergency, accessed 30 July 2026.
• Iran-United States Claims Tribunal, founding documents, accessed 30 July 2026.
• *Dames & Moore v Regan*, US Reports, accessed 30 July 2026.
• Office of the Historian, Treasury memorandum on the freeze, 22 November 1979, accessed 30 July 2026.
• US Government Accountability Office, *Foreign Regimes' Assets*, accessed 30 July 2026.