What government agency is responsible for collecting federal taxes in the US?

The essential government body tasked with collecting federal taxes in the United States plays a crucial role in funding nearly all federal operations, from national defense to infrastructure and social programs. This agency, part of the Department of the Treasury, is responsible for administering the Internal Revenue Code, which is the main body of federal tax law. Without the consistent collection of these revenues, the vast array of services and functions provided by the federal government would simply not be possible.

The origins of this vital agency stretch back to the American Civil War. In 1862, President Abraham Lincoln established the Office (Review) of Commissioner of Internal Revenue to implement the nation's first income tax, a temporary measure designed to help finance the Union's war efforts. This early iteration was responsible for assessing and collecting these crucial wartime funds, which covered over a fifth of the Union's expenses. While the income tax was repealed a decade later, the need for a permanent system became clear with the ratification of the Sixteenth Amendment in 1913, which granted Congress the authority to levy taxes on income. This led to the creation of the Bureau of Internal Revenue, later renamed the Internal Revenue Service in 1953.

Today, this agency does more than just collect taxes; it also provides extensive assistance to taxpayers, helps them understand their responsibilities, and works to resolve erroneous or fraudulent filings. Its mission is to ensure the fair and impartial enforcement of tax laws, thereby maintaining the integrity of the tax system. Annually, it processes hundreds of millions of tax returns and collects trillions of dollars, representing approximately 96 percent of the operational funding for the federal government. This makes its work fundamental to the functioning of the entire U.S. government.