The document provides an overview of the Foreign Account Tax Compliance Act (FATCA), which was enacted to combat the underreporting of U.S. persons' income held in offshore accounts, potentially costing the IRS up to $100 billion a year. FATCA establishes compliance requirements for foreign financial institutions (FFIs), which can choose to participate with the IRS, face a 30% withholding tax, or comply with inter-governmental agreements. It also compares FATCA with the Foreign Bank and Financial Accounts Report (FBAR) by highlighting their differing reporting limits, deadlines, and penalties.