The provisions commonly known as the Foreign Account Tax Compliance Act (FATCA) became law in March 2010.
FATCA targets tax non-compliance by U.S. taxpayers with foreign accounts
FATCA focuses on reporting:
By U.S. taxpayers about certain foreign financial accounts and offshore assets.
By foreign financial institutions about financial accounts held by U.S. taxpayers or foreign entities in which U.S. taxpayers hold a substantial ownership interest.
The objective of FATCA is the reporting of foreign financial assets; withholding is the cost of not reporting.