Definition
A Cost-Plus-Fixed-Fee (CPFF) contract is a type of cost reimbursement contract where the government pays the contractor back for all allowable costs incurred during the work, plus a fee that is negotiated and fixed at the start of the contract, and does not change regardless of how much the project actually costs.
In simple terms, the government covers your costs, and your profit is locked in from day one, whether the project comes in under budget or over budget.
The Simple Explanation
Imagine a biotech firm is hired by the National Institutes of Health (NIH) to research a new treatment for a rare disease. Nobody knows exactly how many lab hours, how much equipment, or how many research iterations will be needed. A fixed price contract would be impossible, as the scope is too uncertain.
So the NIH awards a CPFF contract. The estimated cost is $5 million, and the fixed fee, the contractor's profit, is set at $400,000. If the research ends up costing $6 million, the government reimburses $6 million. If it costs $4 million, the government reimburses $4 million. Either way, the contractor earns exactly $400,000 as their fee, no more, no less.
The cost risk sits with the government. The contractor's profit is predictable from day one.
Key Characteristics of a CPFF Contract
- All allowable costs are reimbursed: Labor, materials, overhead, subcontractor costs, travel, any cost that meets FAR allowability standards gets paid back.
- Fee is fixed at contract award: The fee is negotiated upfront and does not change based on actual cost performance.
- Government bears the cost risk: If costs exceed the estimate, the government typically funds the overrun, up to any ceiling established in the contract.
- Minimum incentive for cost control: Because the fee does not increase with efficiency, the contractor has less motivation to cut costs compared to CPIF or fixed price contracts.
- Fee limits apply: Under FAR 15.404-4, the fixed fee for research and development contracts is generally capped at 15% of estimated cost, and at 10% for other cost contracts.
- Governed by FAR 16.306: The Federal Acquisition Regulation sets the rules for when and how CPFF contracts can be used.
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Two Forms of CPFF Contracts
CPFF contracts come in two distinct structures:
1. Completion Form The contractor is required to deliver a specific, defined end product, such as a final research report or a working prototype, within the estimated cost. If costs exceed the estimate, the government can require more work without increasing the fee, provided it increases the funded ceiling. This is the preferred form when deliverables can be clearly defined.
2. Term Form The contractor agrees to devote a specified level of effort over a set time period. The fee is paid when the contractor certifies that the agreed level of effort has been expended, regardless of what was accomplished. This form is used when the nature of the work makes it impractical to define a specific end product upfront.
Real-Life Government Contract Example
In a published contract award, NASA selected Stinger Ghaffarian Technologies, LLC (a KBRwyle business unit) for a Cost-Plus-Fixed-Fee hybrid contract for intelligent systems research and development support services at NASA's Ames Research Center in Moffett Field, California. The contract covered scientific research, technology development, and advanced information systems support across NASA missions. It included a two-year base period and three two-year options, with a maximum value of $400 million.
This is a textbook use case for CPFF, highly technical R&D work with uncertain scope, requiring flexibility in costs while providing the contractor a predictable, stable fee. (Source: NASA.gov)
When Is a CPFF Contract the Right Choice?
CPFF contracts are appropriate when:
- The scope of work is uncertain and cannot be accurately priced upfront
- The project involves research, development, or exploration, where outcomes are hard to predict
- Technical risk is high, and it would be unreasonable to expect a contractor to accept a fixed price
- The government wants to encourage contractor participation in work that might otherwise be too risky to bid on
They are generally not appropriate when:
- The scope is well-defined (use a fixed price instead)
- The government wants the contractor to have a strong financial incentive to control costs (use CPIF instead)
- The work has moved past early-stage R&D into full-scale development with established requirements
Pros and Cons: A Vendor's Perspective
Pros
- Predictable profit: Your fee is locked in from day one; no matter what happens during performance, you know exactly what you will earn.
- Low financial risk: Allowable costs are reimbursed, so cost overruns do not come out of your pocket.
- Access to complex, high-value work: CPFF contracts are often used for large, sophisticated programs, giving vendors access to significant long-term engagements.
- Easier to bid: Because you are not absorbing cost risk, you do not need to build in large contingency buffers in your proposal.
Cons
- No upside for efficiency: Unlike CPIF, there is no financial reward for bringing the project in under budget. Your fee stays the same whether you are efficient or not.
- Heavy administrative burden: Meticulous cost tracking, documentation, and compliance with FAR cost principles are required throughout performance.
- DCAA audit exposure: The government has the right to audit your costs at any time. Unallowable costs must be returned.
- Fee is capped: The government limits how much fee you can earn as a percentage of the estimated cost, so your profit ceiling is constrained.
- Requires an approved accounting system: Vendors must have a DCAA-compliant accounting system in place to be eligible for CPFF contracts.
Is a CPFF Contract the Same as CPIF or CPPC?
These three contract types are often confused because they all involve cost reimbursement. Here is how they differ:
- CPFF: Fee is fixed; it never changes, regardless of cost performance. No incentive to control costs beyond avoiding audit findings.
- CPIF: Fee is variable; it goes up if you come in under target cost, and down if you go over. Directly rewards cost efficiency.
- CPPC: Fee is a percentage of actual costs; the more you spend, the more you earn. Illegal in federal contracting under FAR 16.102(c).
CPFF sits in the middle, safer than CPIF for the contractor, but offering the government less cost discipline than CPIF provides.
Key Statistics
- The fixed fee on CPFF contracts for R&D work is capped at 15% of estimated cost, and at 10% for other work under FAR 15.404-4. (Source: acquisition.gov)
- CPFF is one of the most commonly used contract types for federally funded research, used extensively by NASA, NIH, the Department of Energy, and the Department of Defense for early-stage development work.
- The National Science Foundation (NSF) lists CPFF as one of its primary contract types for research and development acquisitions. (Source: NSF.gov)
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Common Terms Associated with CPFF Contracts
CPFF Contracts in the SLED Market: What Vendors Should Know
CPFF contracts are not common in the standard SLED procurement environment; most state and local agencies prefer simpler structures like fixed price or T&M. However, CPFF-style arrangements do appear in the SLED market in specific contexts:
- Federally funded research programs: Public universities and state research institutions that receive federal R&D funding often operate under CPFF contracts, either directly with a federal agency or as subcontractors under a federal prime.
- Federal pass-through grants: When a state agency receives federal funds and sub-awards work to a vendor, the cost reimbursement structure, including something similar to CPFF, may flow down to the vendor level, governed by 2 CFR Part 200 (Uniform Guidance).
- State-funded R&D initiatives: Some states fund their own research programs through universities or private firms using cost reimbursement structures that closely mirror CPFF.
For SLED vendors working with universities, public health agencies, or state-level research programs, understanding CPFF and the accounting and documentation requirements that come with it is valuable preparation for these engagements.
Quick Summary
A CPFF contract reimburses all allowable costs and pays a fixed, pre-negotiated fee that does not change regardless of actual spending. It is the go-to structure for R&D, scientific research, and complex exploratory work where costs cannot be predicted upfront. For vendors, it offers predictable profit and low financial risk, but demands strong accounting systems, audit readiness, and meticulous cost tracking. In the SLED market, CPFF structures appear most often in federally funded university research and grant pass-through programs.
