The Internal Revenue Service (IRS) is the federal agency responsible for administering and enforcing the U.S. tax code. It is a part of the Department of the Treasury and is charged with collecting taxes, processing tax returns, and enforcing tax laws. The IRS is headquartered in Washington D.C. and has regional offices and field offices throughout the country. It employs over 70,000 people who work to ensure that taxpayers comply with the law and pay the correct amount of taxes.