On January 17, Treasury and the IRS issued comprehensive final regulations implementing the information reporting and withholding tax provisions commonly known as the Foreign Account Tax Compliance Act (FATCA).  These regulations finalize the step-by-step process for U.S. account identification, information reporting, and withholding requirements for foreign financial institutions (FFIs), other foreign entities, and U.S. withholding agents.  Treasury Release.  FATCA Information.