How prevailing wages, health & welfare fringe, and wage determinations work on federal service contracts — and how to stay out of trouble with the Department of Labor.
Last reviewed on May 12, 2026 by the Government.biz editorial team against 41 U.S.C. 6701–6707 and 29 CFR Part 4.
The McNamara-O'Hara Service Contract Act of 1965 (SCA), codified at 41 U.S.C. 6701–6707 and implemented by 29 CFR Part 4, requires contractors and subcontractors performing services on covered federal contracts to pay their service employees no less than the prevailing wages and fringe benefits in the locality. The Department of Labor (DOL) determines those rates; the contractor is responsible for applying them correctly to every covered worker.
The SCA is one of the three core federal labor standards a contractor encounters, alongside the Davis-Bacon Act (which covers construction) and the Fair Labor Standards Act. Knowing which applies — and never accidentally applying two at once — is the foundation of labor compliance on a services contract.
The SCA applies when all of the following are true: the contract is with the federal government or the District of Columbia; its principal purpose is to furnish services; the work is performed in the United States; and it uses "service employees." Coverage attaches above $2,500. Below that figure, the FLSA minimum wage governs instead.
A wage determination (WD) is the document — issued by the DOL and incorporated into your contract — that lists the minimum hourly wage and fringe benefits for each labor classification in the contract's geographic area. There are two kinds:
You can look up wage determinations through SAM.gov (which absorbed the former WDOL system). The WD assigned to your contract — not a generic one — is the controlling document. Read the classifications carefully: paying the right rate to the wrong classification is still a violation.
SCA fringe benefits come in two parts:
| Minimum H&W rate | Set by DOL; read it from your wage determination (adjusted periodically) |
| How it can be provided | Bona fide benefits, cash equivalent, or a combination |
| Qualifying benefits | Health insurance, retirement, life/disability insurance, certain leave |
| Separate obligations | Vacation and holiday pay are in addition to H&W |
If your contract requires a labor classification that does not appear on the wage determination, you cannot simply guess a rate. You must request a conformance: after award, the contractor and the affected employees (or their representative) propose a wage and fringe rate, and the contracting officer forwards the request to the DOL on Standard Form 1444. The proposed rate must bear a "reasonable relationship" to the rates already on the WD. Once approved, the conformed rate applies retroactively to the date the employee first performed the work — so document the start date carefully.
When you win a follow-on services contract that the incumbent performed with a unionized workforce, Section 4(c) generally requires you to pay at least the wages and benefits in the predecessor's CBA — even though you were not party to it. The catch is timing: the CBA only binds you if it was provided to the contracting agency in time. Always ask the agency for any incumbent CBA during the proposal phase and price to it. A surprise CBA discovered after award can erase the margin on a re-compete.
On multi-year and option contracts, the wage determination is typically updated at each option exercise. FAR clauses 52.222-43 (fixed-price) and 52.222-44 provide for an equitable price adjustment so the contractor is made whole for increases in DOL-required wages and benefits — but only for the increases the WD compels, not for general wage growth you chose to give. Track the delta between the old and new WD precisely; the adjustment is limited to actual increased costs of compliance.
Federal and D.C. service contracts over $2,500 performed in the U.S. with service employees. Below $2,500 the FLSA minimum wage applies. Construction, supply contracts, and bona fide professional/executive/administrative employees are outside the SCA.
The DOL sets and periodically adjusts the H&W rate, so the controlling figure is the one printed on the wage determination attached to your specific contract. Don't rely on a number from another source — read it off your WD.
File a conformance on Standard Form 1444 through the contracting officer. You propose a rate reasonably related to the existing WD classifications; once DOL approves, it applies retroactively to when the work began.
Under Section 4(c), a successor generally must pay at least the predecessor CBA's wages and benefits, provided the CBA was timely furnished to the agency. Always request any incumbent CBA before you bid and price to it.
The SCA covers service contracts; the Davis-Bacon Act covers construction. Both set prevailing wages, but they use different wage determinations and apply to different work. A contract can occasionally involve both, but a given task is governed by one or the other.
Authoritative sources: DOL Wage and Hour Division — Service Contract Act, 29 CFR Part 4, and SAM.gov wage determinations. This page is general information, not legal advice.