Types of Government Contracts: Fixed-Price, Cost-Plus, T&M, and IDIQ Explained

These are not just bureaucratic labels. The contract type determines who carries the financial risk, you or the government. Pick wrong (or misunderstand what you are signing), and a profitable-looking contract can turn into a money pit.

The rules governing contract types live in FAR Part 16, which outlines when each type should be used and how risk is shared between the government and the contractor. This guide walks through every major contract type, explains when each one shows up, and helps you understand the real-world implications for your business.

The Two Fundamental Categories

Every government contract falls somewhere on a spectrum between two extremes:

• Fixed-price contracts: The contractor bears most of the cost risk. You agree to deliver a defined scope for a set price, and if it costs more than expected, that comes out of your pocket.
• Cost-reimbursement contracts: The government bears most of the cost risk. You get reimbursed for allowable costs, plus a fee. If costs run higher than estimated, the government generally covers it (within limits).

Everything else is a variation or hybrid of these two approaches.

Contract Type Comparison Table

Fixed-Price Contracts

Firm Fixed-Price (FFP)

This is the most common contract type in federal procurement. Under an FFP contract, you agree to deliver a specific product or service for a specific price. Period.

How it works:

• The government defines the requirements
• You submit a price to deliver those requirements
• If your actual costs are lower than your price, you keep the profit
• If your actual costs exceed your price, you absorb the loss

When the government uses FFP:

• Requirements are well-defined and stable
• The work has been done before (low technical risk)
• Adequate competition exists to ensure fair pricing
• Commercial or near-commercial items

The contractor's perspective: FFP contracts reward efficiency. If you can deliver faster or cheaper than your estimate, the margin is yours. But scope creep on an FFP contract is deadly. Every change you absorb without a contract modification cuts directly into your profit.

Pro tip: On FFP contracts, your assumptions section in the proposal is critical. Document every assumption about scope, government-furnished equipment, timelines, and access. When things change, those documented assumptions become the basis for equitable adjustments under FAR 52.243.

Fixed-Price Incentive Firm (FPIF)

FPIF contracts add a profit incentive to the basic fixed-price structure. The government and contractor agree on a target cost, target profit, ceiling price, and a share ratio.

How it works:

• If final costs are below the target, you split the savings with the government
• If final costs exceed the target, you split the overrun, but your total price cannot exceed the ceiling
• Above the ceiling price, the contractor absorbs 100% of the overrun

Example: Target cost of $10M, target profit of $1M, ceiling price of $12M, share ratio of 70/30 (government/contractor). If actual costs come in at $9M, the $1M savings is split: government saves $700K, contractor earns an extra $300K on top of the target profit.

When it is used: Major defense acquisitions, production contracts, and situations where the government wants to motivate cost control but recognizes some uncertainty.

Fixed-Price with Economic Price Adjustment (FP-EPA)

These contracts include provisions for adjusting the price based on specific economic conditions, usually tied to published indices like the Bureau of Labor Statistics Employment Cost Index or commodity price indices.

When it is used: Long-term contracts (3+ years) for services or supplies where labor costs or material costs are expected to change significantly. Common in facilities maintenance, food services, and fuel supply contracts.

Cost-Reimbursement Contracts

Cost-reimbursement contracts require the contractor to have an approved accounting system that complies with Cost Accounting Standards (CAS). This is a significant barrier to entry for many small businesses.

Cost-Plus-Fixed-Fee (CPFF)

Under CPFF, the government reimburses your allowable costs and pays a fixed fee (profit) that does not change regardless of actual costs.

How it works:

• You incur costs performing the work
• The government reimburses allowable, allocable, and reasonable costs
• You receive a pre-negotiated fixed fee on top of costs
• The fee does not increase if costs go up, and does not decrease if costs go down

When the government uses CPFF:

• Research and development work
• Study and analysis efforts
• Situations where the scope is too uncertain for fixed-price
• FAR 16.306 limits the fee to 10% of estimated cost for R&D and 15% for other work

The contractor's perspective: CPFF contracts protect you from cost overruns but limit your upside. The real risk is fee erosion: if costs grow substantially, your fixed fee represents a smaller percentage of total effort. Also, the government's definition of "allowable" costs under FAR Part 31 is strict. Unallowable costs come out of your pocket.

Cost-Plus-Incentive-Fee (CPIF)

CPIF contracts add a performance incentive to the cost-reimbursement structure. The fee varies based on how well you control costs relative to a target.

How it works:

• Government and contractor agree on target cost, target fee, minimum fee, maximum fee, and share ratio
• If actual costs come in below target, the contractor's fee increases (up to the maximum)
• If actual costs exceed target, the contractor's fee decreases (down to the minimum)

When it is used: Complex development or production programs where the government wants to motivate cost control but the scope is too uncertain for fixed-price. Common in defense systems development.

Cost-Plus-Award-Fee (CPAF)

CPAF contracts include a base fee (usually small) plus an award fee determined by the government's subjective evaluation of contractor performance.

How it works:

• The contractor receives a small base fee (often 0-3%)
• An Award Fee Board evaluates performance at set intervals
• The board rates performance (e.g., Excellent, Very Good, Satisfactory, Unsatisfactory)
• The contractor earns a portion of the available award fee based on the rating

When it is used: Service contracts where quality is critical and hard to measure objectively. IT services, logistics support, and facilities management frequently use CPAF structures.

The contractor's perspective: CPAF contracts require constant attention to customer satisfaction. The award fee evaluation is inherently subjective, so maintaining strong communication with your government counterpart is essential.

Time and Materials / Labor Hour Contracts

Time and Materials (T&M)

T&M contracts pay the contractor based on fixed hourly labor rates plus actual material costs. They are considered a last resort under FAR 16.601 because the government assumes significant cost risk.

How it works:

• Labor rates are negotiated and fixed for each labor category
• You bill actual hours worked at those fixed rates
• Materials are reimbursed at actual cost (or with a negotiated handling rate)
• The contract includes a ceiling price that cannot be exceeded without modification

When the government uses T&M:

• The scope of work cannot be defined enough for fixed-price
• It is not practical to estimate costs accurately
• Common for engineering support, IT services, and maintenance/repair

Important: The contracting officer must justify in writing why no other contract type is suitable. T&M contracts also require government surveillance to monitor hours billed.

Labor Hour (LH)

Labor Hour contracts are identical to T&M except there are no materials, only labor. The contractor bills fixed hourly rates for hours worked.

When it is used: Staff augmentation, help desk support, and other labor-only services where the government needs flexible staffing.

Indefinite Delivery Contracts

Indefinite Delivery/Indefinite Quantity (IDIQ)

IDIQ contracts are among the most important vehicles in federal contracting. They establish a framework under which the government can issue task orders (for services) or delivery orders (for products) over a period of years.

How it works:

• The government awards an IDIQ contract with a minimum and maximum value
• The minimum can be as low as one order
• Individual task orders are competed among IDIQ holders (or sole-sourced in single-award IDIQs)
• Each task order can be FFP, T&M, CPFF, or any other appropriate type
• Contract periods often run 5-10 years including option periods

Why IDIQ matters:

• The largest government contracts are IDIQs: Alliant 2, OASIS+, CIO-SP4, which are multi-billion dollar vehicles
• Winning a spot on an IDIQ is step one; winning task orders is step two
• Position on an IDIQ vehicle provides past performance and credibility

The contractor's perspective: IDIQs require a two-stage investment. First, you invest in winning the base contract (which generates zero revenue by itself). Then you compete for individual task orders. Having a strategy for both stages is critical.

Blanket Purchase Agreements (BPA)

BPAs simplify recurring purchases by establishing pre-negotiated terms with one or more vendors. They are not technically contracts but agreements that streamline ordering.

How it works:

• Usually established against GSA Schedule contracts
• The government sets up a BPA with one or more vendors
• Individual orders are placed as needs arise
• BPAs for single vendors can have a maximum value; multi-vendor BPAs may require competition for orders above certain thresholds

When it is used: Office supplies, IT hardware, temporary staffing, and other recurring purchases where the government wants to avoid processing individual contracts each time.

How Contract Types Affect Your Proposal Strategy

The contract type should directly influence how you write your proposal and structure your pricing:

For FFP contracts:

• Build realistic cost estimates with appropriate contingency
• Document every assumption
• Price for the risk you are taking
• Focus your technical approach on efficient execution

For cost-reimbursement contracts:

• Ensure your accounting system meets government standards
• Demonstrate cost control processes
• Emphasize transparency and reporting capabilities
• Build your wrap rates (indirect rates) to recover overhead

For T&M contracts:

• Negotiate competitive but sustainable labor rates
• Show how you will provide qualified personnel
• Demonstrate time-tracking and reporting systems
• The labor rate is your only lever, so make sure it covers all costs plus profit

For IDIQ task orders:

• Treat each task order as a mini-competition
• Build a library of reusable proposal content
• Maintain a bench of available staff
• Track task order opportunities across your IDIQ portfolio using tools like Bidovate that monitor new task order solicitations

How to Research Which Contract Types Agencies Prefer

Different agencies and program offices favor different contract types. Before investing in a pursuit, research the agency's contracting patterns:

• FPDS.gov: Search Federal Procurement Data System to see what contract types an agency has used historically for similar work
• USAspending.gov: Drill into award data to see contract types, values, and periods of performance
• SAM.gov: Review active solicitations in your NAICS codes to see current trends
• Bidovate: Use Bidovate's competitive intelligence features to quickly analyze contract type patterns without manually searching multiple databases

Understanding the agency's preference helps you prepare the right accounting infrastructure and proposal approach before the solicitation drops.

FAQ

What is the most common type of government contract?

Firm Fixed-Price (FFP) is by far the most common type, accounting for the majority of federal contract actions. The government prefers FFP because it places cost risk on the contractor and simplifies contract administration. If you are new to government contracting, expect most of the opportunities you encounter to be FFP.

Can a small business handle cost-reimbursement contracts?

Yes, but it requires an accounting system that meets government standards, specifically the Cost Accounting Standards (CAS) and FAR Part 31 cost principles. Many small businesses start with FFP and T&M contracts before investing in the accounting infrastructure needed for cost-reimbursement work. The Defense Contract Audit Agency (DCAA) will audit your system.

What does "best value" mean in the context of contract types?

Best value refers to the evaluation approach, not the contract type. Under a best-value evaluation, the government considers factors beyond just price: technical approach, past performance, management capability, and staffing. Best-value evaluations can apply to any contract type. The alternative is Lowest Price Technically Acceptable (LPTA), where the cheapest proposal that meets minimum standards wins.

How do I know which contract type a solicitation will use?

The contract type is stated in Section B (Supplies or Services and Prices/Costs) and Section L (Instructions to Offerors) of the solicitation. It is also listed in pre-solicitation notices and Sources Sought on SAM.gov. If you are tracking opportunities early, agency procurement forecasts often indicate the anticipated contract type.

What is the difference between an IDIQ and a GWA C?

A GWAC (Government-Wide Acquisition Contract) is a specific type of IDIQ that is available for use by any federal agency, not just the awarding agency. GWACs like Alliant 2 and CIO-SP4 are managed by designated agencies (GSA and NIH, respectively) but can be used government-wide. A standard IDIQ may be limited to a single agency or component.