The Foreign Account Tax Compliance Act (FATCA) is a U.S. federal law enacted in 2010 aimed at combating tax evasion by U.S. persons holding accounts and other financial assets outside the United States. It requires foreign financial institutions (FFIs) to report information about financial accounts held by U.S. taxpayers to the Internal Revenue Service (IRS), thus facilitating the enforcement of U.S. tax laws. By promoting transparency and collaboration between countries, FATCA has significant implications for international portfolio investment, as it affects how foreign investments are managed and reported by American investors.