Cost-Reimbursement Contracts Explained: What Small Contractors Need to Know

What a Cost-Reimbursement Contract Actually Means

Under a cost-reimbursement contract, the government agrees to reimburse a contractor for costs that are allowable under FAR Part 31, allocable to the specific contract, and reasonable in amount. Unlike a firm-fixed-price contract where the contractor absorbs cost overruns, a cost-reimbursement contract shifts most financial risk to the government. The contractor is still obligated to complete the defined work within the estimated cost and period of performance, but if legitimate costs exceed the original estimate, the contractor can request additional funding rather than absorbing the loss.

The key authority for these contract types is FAR Subpart 16.3, which governs cost-reimbursement contracts and defines several variants. The government must determine that cost-reimbursement is appropriate before awarding one, which generally requires a finding that the procurement involves substantial uncertainty in scope, technical risk, or both. Agencies also need to confirm that the contractor has an accounting system capable of tracking costs by contract, a requirement that catches many small businesses off guard during pre-award surveys.

• Allowable costs: defined by FAR Part 31 (e.g., direct labor, fringe benefits, overhead, G&A)
• Unallowable costs: entertainment, certain lobbying, fines, and others explicitly excluded by FAR 31.205
• Estimated cost ceiling: the contractor must notify the contracting officer before exceeding it
• Accounting system requirement: DCAA may audit your system before or after award

The Main Variants: CPFF, CPAF, CPIF, and More

Cost-reimbursement is not a single contract type but a family. The most common variant for small contractors is the Cost-Plus-Fixed-Fee (CPFF), where the fee is negotiated at award and does not change regardless of how efficiently or inefficiently work is performed. The fixed fee is expressed as a percentage of estimated cost, with FAR 15.404-4 setting statutory limits: generally 10 percent of estimated cost for experimental or developmental work and 6 percent for architect-engineer services.

Cost-Plus-Award-Fee (CPAF) contracts add a subjective, performance-based layer. An award fee board evaluates contractor performance periodically and grants additional fee above a base amount. This structure is common on longer research, operations, and support contracts where the government wants to motivate quality over time. Cost-Plus-Incentive-Fee (CPIF) contracts tie fee adjustments to measurable outcomes such as cost savings or schedule adherence, using a formula negotiated at award. For small businesses, CPFF is the most straightforward starting point because the fee calculation is predictable and the administrative burden is lower than CPAF.

When Agencies Choose Cost-Reimbursement Over Fixed-Price

Contracting officers are required by FAR 16.301-2 to use cost-reimbursement contracts only when uncertainties in performance do not permit costs to be estimated with enough confidence to support a fixed-price arrangement without risk of contractor loss or excessive contingency pricing. In practice this means you will see cost-reimbursement most often in basic and applied research, early-stage development, complex information technology modernization, and certain professional services contracts where the level of effort is genuinely unknown at the time of solicitation.

Defense agencies such as DoD, DARPA, and the service research labs are heavy users, as are civilian science agencies like NIH, NSF, and DOE. If you are searching SAM.gov and see solicitations referencing CPFF, CPAF, or a cost-reimbursement IDIQ vehicle such as certain CIO-SP3 task orders, those signals indicate the agency has already determined that fixed-price is not appropriate for that work.

The Accounting System Requirement: A Make-or-Break Hurdle

One of the most important practical requirements for winning a cost-reimbursement award is having an accounting system that can segregate direct and indirect costs by contract. FAR 16.301-3 explicitly states that before awarding a cost-reimbursement contract, the contracting officer must determine that the prospective contractor has an adequate accounting system. The Defense Contract Audit Agency (DCAA) conducts pre-award accounting system audits for many cost-reimbursement procurements, particularly for DoD contracts above the simplified acquisition threshold.

For a small business, this is a serious preparation item. You do not need DCAA approval to pursue an opportunity, but you do need it before award is made. Common accounting systems used by small GovCon firms include Deltek Costpoint, Unanet, and QuickBooks configured with proper job costing, though the acceptability of any system depends on how it is configured, not the brand name. If your system has never been audited, consider requesting a pre-award survey early in the process so deficiencies can be corrected before they block an award.

1. Step 1: Assess your current accounting systemDetermine whether your system can track direct labor, fringe, overhead, G&A, and fee by individual contract. If not, you likely cannot receive a cost-reimbursement award.
2. Step 2: Review DCAA's pre-award audit checklistDCAA publishes guidance on its website (dcaa.mil) describing what auditors look for. Use it as a readiness checklist before submitting a proposal.
3. Step 3: Engage your contracting officer earlyNotify the CO that you are pursuing the opportunity and ask about their accounting system review timeline. This avoids surprises at the end of negotiations.
4. Step 4: Build indirect rate structuresEstablish fringe, overhead, and G&A rates based on your historical or projected costs. These rates are central to pricing your cost proposal and will be scrutinized during proposal evaluation.

How to Price a Cost-Reimbursement Proposal

Pricing under cost-reimbursement requires you to build a bottom-up cost estimate rather than a market-based price. You will typically submit a cost volume alongside your technical volume, detailing direct labor by labor category and hours, fringe benefits, overhead, materials, subcontractor costs, travel, other direct costs (ODCs), and G&A applied to the total. Your fee is added on top of estimated cost. The government evaluates cost proposals for realism, meaning they assess whether your estimate reflects what the work will actually cost, not just whether it is low.

A concrete example: if you are proposing 2,000 hours of a senior systems engineer at a direct labor rate of $75 per hour, fringe at 30 percent, overhead at 40 percent applied to direct labor plus fringe, and G&A at 12 percent applied to total cost, your loaded cost for that one labor category is roughly $75 x 2,000 = $150,000 direct labor, plus $45,000 fringe, plus $78,000 overhead, plus $32,760 G&A, totaling approximately $305,760 before fee. Adding a 10 percent CPFF of $30,576 yields a proposed cost-plus-fee of about $336,336. Every line must be traceable to actual rate agreements or supporting documentation.

Risks and Limitations Small Contractors Often Overlook

Cost-reimbursement contracts are not a blank check. The contractor cannot exceed the estimated cost ceiling without a formal modification, and if the government declines to increase funding, the contractor must stop work rather than continue and absorb costs. This limitation of government liability means cash flow planning and ongoing cost tracking are critical. You should set up internal cost-to-complete reviews at regular intervals so you can alert the contracting officer before hitting the ceiling, which is both a regulatory requirement and a practical protection for your firm.

Compliance burden is also higher than on fixed-price contracts. You may face DCAA incurred cost audits annually, requiring submission of the Incurred Cost Electronically (ICE) model within six months of fiscal year end. Unallowable costs inadvertently billed can trigger repayment demands and, in serious cases, False Claims Act exposure. Small businesses new to cost-reimbursement often underestimate the internal staff time required for compliant billing and reporting. Weigh these administrative costs against the revenue opportunity before committing to pursue a cost-reimbursement vehicle.

Finding Cost-Reimbursement Opportunities on SAM.gov

Cost-reimbursement solicitations are posted on SAM.gov like any other federal opportunity. When reading a solicitation, look for contract type language in Section B or the SF 1449/SF 26 block. Terms like CPFF, CPAF, cost-plus, or cost-reimbursement in the solicitation text are reliable indicators. You can also filter SAM.gov opportunity searches by NAICS code and then read solicitations in sectors where cost-reimbursement is common, such as R&D (NAICS 54171x) or IT professional services on certain vehicles.

Staying current on new solicitations in your target agency and NAICS codes is easier when you have a monitoring process in place rather than running ad hoc searches. The earlier you spot a cost-reimbursement opportunity, the more time you have to assess your accounting system readiness, identify teaming partners if needed, and develop a credible cost structure before the proposal deadline.