The site navigation utilizes arrow, enter, escape, and space bar key commands. Left and right arrows move across top level links and expand / close menus in sub levels. Up and Down arrows will open main level menus and toggle through sub tier links. Enter and space open menus and escape closes them as well. Tab will move on to the next part of the site rather than go through menu items.
The Office of the Commissioner of Internal Revenue was established by act of July 1, 1862 (26 U.S.C. 7802). The Internal Revenue Service (IRS) is responsible for administering and enforcing the internal revenue laws and related statutes, except those relating to alcohol, tobacco, firearms, and explosives. Its mission is to collect the proper amount of tax revenue, at the least cost to the public, by efficiently applying the tax law with integrity and fairness.