31 U.S.C. § 712

1. (1)investigate all matters related to the receipt, disbursement, and use of public money;
2. (2)estimate the cost to the United States Government of complying with each restriction on expenditures of a specific appropriation in a general appropriation law and report each estimate to Congress with recommendations the Comptroller General considers desirable;
3. (3)analyze expenditures of each executive agency the Comptroller General believes will help Congress decide whether public money has been used and expended economically and efficiently;
4. (4)make an investigation and report ordered by either House of Congress or a committee of Congress having jurisdiction over revenue, appropriations, or expenditures; and
5. (5)give a committee of Congress having jurisdiction over revenue, appropriations, or expenditures the help and information the committee requests.