The Foreign Investment in Real Property Tax Act of 1980 (FIRPTA), enacted as Subtitle C of Title XI (the "Revenue Adjustments Act of 1980") of the Omnibus Reconciliation Act of 1980, Pub. L. No. 96-499, 94 Stat. 2599, 2682 (Dec. 5, 1980), is a United States tax law that imposes income tax on foreign persons disposing of United States real property interests..