When must a United States (U.

 A U.S. bank must block or reject an international funds transfer when there is an OFAC designated party to the transaction, regardless of the beneficiary or the correspondent bank. This is because the U.S. bank is prohibited from dealing with any person or entity that is on the Specially Designated Nationals and Blocked Persons List (SDN List) or subject to any other OFAC sanctions program1. The SDN List includes individuals, groups, and entities, such as terrorists and narcotics traffickers, that are designated under programs that are not country-specific2. The U.S. bank must also report any blocked or rejected transactions to OFAC within 10 business days3.

 1: FFIEC BSA/AML Office of Foreign Assets Control - Office of Foreign … 2: Specially Designated Nationals And Blocked Persons List (SDN) Human … 3: [Reporting Blocked Transactions | Office of Foreign Assets Control]