FOREIGN INVESTMENT IN REAL PROPERTY TAX ACT (FIRPTA) What is FIRPTA? It's the Foreign Investment in Real Property Tax Act of 1980. It is a tax law that applies to foreign persons who are disposing of U.S. property. Who does FIRPTA affect? FIRPTA affects all non-resident aliens and foreign companies not considered to be American corporations. From a taxation (tax return) standpoint, when a person who doesn't live in the United States or when a foreign corporation sells a pr