what is the irs
Internal Revenue Service. The Internal Revenue Service (IRS) is responsible for the determination, assessment, and collection of internal revenue in the United States. This revenue consists of personal and corporate income taxes, excise, estate, and gift taxes, as well as employment taxes for the nations Social Security system. The Bureau of Internal Revenue was established July 1, 1862, to collect the new income tax, which was used to pay for the Civil War.