SIN 541211 contractors: audit services for agencies
SIN 541211 covers financial statement and performance audits, recovery audits, transportation audits and contract audits under Generally Accepted Government Auditing Standards (the GAO Yellow Book) or other standards. Inspectors general use it to contract out statement audits, and agencies use it for improper payment and recovery audit work.
The holders in numbers
On 29 October 2026 the GSA eLibrary entry for SIN 541211 listed 195 contracts (190 distinct company names). Small businesses hold 150 (77%); the other 45 are flagged other than small. Counting the programme flags shown on each record gives 28 8(a), 29 SDVOSB, 41 WOSB and 14 HUBZone holders.
The home addresses cover 30 states and territories. The largest groups are in Virginia (53), Maryland (43) and the District of Columbia (15), and the Washington area (VA, MD, DC) accounts for 57%. Looking at the rest of each contract, the commonest companions are 541611 management and financial consulting (162), 541219 Budget and Financial Management Services (141), 54151S IT professional services (63); the average contract carries 6.8 SINs. 4 contracts are marked closed for new awards.
How it differs from related buying routes
Recovery audits look for overpayments and duplicate payments, often paid partly on contingency. Because a firm cannot audit statements it helped prepare, agencies keep audit (541211) and accounting support (541219) apart, even though 141 contracts hold both SINs; holders are concentrated around Washington.
Federal spending in the matching industry code
USAspending.gov reports $1.0 billion in federal contract obligations in fiscal year 2025 (October 2024 to September 2025) coded to NAICS 541211, offices of certified public accountants. The largest awarding agencies were Department of Defense ($542 million), Department of Health and Human Services ($113 million), Department of the Treasury ($82 million). This counts every contract with that industry code, not only orders under this SIN, so it shows the size of the federal market rather than sales through the schedule (retrieved 29 October 2026).
Set-aside status should be confirmed in SAM.gov before relying on the flags. The sample rows below were each checked against the contractor's own eLibrary record.