The Economic Recovery Tax Act of 1981 (ERTA), or Kemp–Roth Tax Cut, was an Act that introduced a major tax cut, which was designed to encourage economic growth. The Act was enacted by the 97th US Congress and signed into law by US President Ronald Reagan. The Accelerated Cost Recovery System (ACRS) was a major component of the Act and was amended in 1986 to become the Modified Accelerated Cost Recovery System (MACRS).

The 97th United States Congress was a meeting of the legislative branch of the United States federal government, composed of the United States Senate and the United States House of Representatives. It met in Washington, D.C., from January 3, 1981, to January 3, 1983, during the final weeks of Jimmy Carter's presidency and the first two years of Ronald Reagan's presidency. The apportionment of seats in the House of Representatives was based on the 1970 United States census.