The commissioner's duties include administering, managing, conducting, directing, and supervising "the execution and application of the internal revenue laws or related statutes and tax conventions to which the United States is a party" and advising the president on the appointment and removal of a chief counsel of the IRS. Treasury Order 150-10 states in relevant part: "The Commissioner of Internal Revenue shall be responsible for the administration and enforcement of the Internal Revenue laws." The commissioner reports to the secretary of the treasury through the
deputy secretary of the treasury. One of the commissioner's most important responsibilities with respect to the internal revenue laws is setting the Treasury Regulations administered by the IRS. The U.S. Treasury Regulations provide (in part): ::(a) Issuance. --The Commissioner, with the approval of the
United States Secretary of the Treasury, or his delegate, shall prescribe all needful rules and all rules and regulations as may be necessary by reason of any alteration of law in relation to internal revenue. However, the general counsel of the Department of the Treasury has "the authority to approve all regulations pertaining to the internal revenue laws, including the authority to ratify and approve, where necessary, any such regulations previously issued." ==List of commissioners==