Most small businesses enter their first federal contract focused on winning the award. The contract type — how the government will actually pay you — often gets less attention than it deserves. That's a mistake. The payment structure determines who absorbs cost overruns, how much accounting overhead you'll carry, and whether a contract that looks profitable on day one bleeds cash by month six.
There are four contract types you'll encounter most often: Firm-Fixed-Price (FFP), Time-and-Materials (T&M), Cost-Plus-Fixed-Fee (CPFF), and Indefinite Delivery/Indefinite Quantity (IDIQ). Each has a different risk profile. None is inherently better than the others — they're tools, and the wrong tool for a given job is expensive.
Firm-Fixed-Price (FFP): You quoted it, you own it
FFP is the simplest structure. The government agrees to pay a set dollar amount for a defined deliverable, regardless of what it costs you to produce it. If you finish early under budget, you keep the difference. If scope creep or bad estimating runs you over, you absorb the loss.
The federal government prefers FFP whenever the work is well-defined enough to price accurately, and for good reason: it shifts all financial risk onto the contractor. For the contracting officer, it simplifies administration — no audits, no cost justifications, no monthly burning of budget against actuals.
For you, FFP is both the most accessible and the most dangerous contract type. Accessible because the threshold to compete is low — you don't need a DCAA-approved accounting system. Dangerous because a weak statement of work can turn a profitable-looking contract into a loss within the first quarter.
What to watch: The Statement of Work (SOW) is everything on an FFP contract. Before you price, ask whether the scope is specific enough that both you and the contracting officer would describe the finished product the same way. If the answer is no, price in contingency or push back before award. Contract modifications (mods) can recover some overruns, but negotiating mods mid-performance is slow and never guaranteed. Also watch the period of performance against the fixed price — if the contract runs 18 months and inflation is moving, you're absorbing that too.
Time-and-Materials (T&M): The government pays the clock
T&M contracts pay you a fixed hourly rate for labor plus reimbursement of actual material costs. You're not on the hook for overruns in the same way as FFP — if the task takes longer than estimated, the government pays more hours. But that dynamic cuts both ways: the government is taking on cost risk, which is why the FAR (Part 16.601) restricts T&M use and requires a determination that no other type is suitable.
T&M sounds contractor-friendly, but it isn't as protective as it looks. The contract ceiling — the not-to-exceed (NTE) dollar amount — is real. Once you hit the ceiling, you stop getting paid unless a mod is issued. Many small businesses have delivered work beyond the ceiling in good faith, expecting a mod, and been stuck with unallowable costs. That's on you, not the government.
Your labor categories and fixed hourly rates matter too. The rates you propose at award are the rates you'll bill for the life of the contract, unless the contract includes escalation clauses. A T&M contract awarded in 2024 at 2024 rates may be hurting you in 2027 if you haven't built in escalation.
What to watch: Understand your ceiling and track burn rate weekly, not monthly. Build escalation into your proposed rates if the period of performance runs more than 12 months. Get any scope change in writing before performing the work — verbal approval from a COR (Contracting Officer's Representative) is not authorization to exceed ceiling.
Cost-Plus-Fixed-Fee (CPFF): The government pays your costs plus a fee
On a CPFF contract, the government reimburses your allowable direct costs — labor, materials, subcontractors — plus a fixed fee that's negotiated at award. The fee is set as a dollar amount, not a percentage, so it doesn't grow if costs grow. FAR 15.404-4 caps the fixed fee on most research and development contracts at 15% of estimated cost, and 10% on other cost-type contracts.
CPFF is common in R&D, early-stage technology development, and complex services where the government accepts that the final cost is genuinely unknowable upfront. Agencies including DARPA, NIH, and DOE use cost-type contracts regularly when the work involves significant technical uncertainty.
The catch is accounting. To bill on a CPFF contract, your accounting system must be DCAA (Defense Contract Audit Agency) compliant. That means direct and indirect costs are segregated, timekeeping is documented and auditable, and your indirect rates — overhead, G&A, fringe — are tracked and applied consistently. A DCAA audit can happen at any time. If your books don't hold up, the government can disallow costs you've already incurred and billed.
Setting up a DCAA-compliant system before your first cost-type award is significantly easier than retrofitting one mid-contract. Tools like Deltek Costpoint and GCS Premier are built for this purpose. QuickBooks with manual workarounds is possible but risky and labor-intensive.
What to watch: Understand which costs are "allowable" under FAR Part 31 before you start charging. Entertainment, alcohol, most lobbying, and certain marketing expenses are expressly unallowable. Charging unallowable costs to a government contract — even accidentally — creates false claims exposure. Get your indirect rate structure locked down before award and hold to it.
IDIQ: A vehicle, not a guarantee
An Indefinite Delivery/Indefinite Quantity contract is a vehicle, not a commitment. The government awards you a contract that says it will order some unspecified quantity of services or supplies over a defined period, subject only to a minimum guarantee. That minimum is often small — sometimes as low as $1,500 or a single task order.
GSA Schedules, GWACs like OASIS and Alliant, and most agency-specific MACs (Multiple Award Contracts) are IDIQ vehicles. Winning an IDIQ award is not a revenue event. It's a hunting license.
Task orders are where the money is. Each task order is a separate competition (or direct award, depending on the vehicle) against other IDIQ holders. Some large IDIQ vehicles have hundreds of awardees, which means your win rate on individual task orders determines whether the vehicle pays off or just consumes your BD bandwidth.
IDIQs do have a ceiling — a maximum dollar value that can be ordered against the contract. That ceiling is not a forecast of actual spend. The government may order against a $50M IDIQ vehicle and issue $3M worth of task orders over its life.
What to watch: Before pursuing an IDIQ vehicle, look at the historical task order data. USASpending.gov shows award history by contract vehicle. If a vehicle has $200M in ceiling but $12M in actual task orders across 40 awardees, your realistic share is narrow. Also evaluate whether the agency has a preference for large business teaming partners on task orders, which can effectively shut out small business primes even on a small-business-set-aside IDIQ.
The practical takeaway
Contract type selection is typically the government's call, but you can influence it at the pre-solicitation stage by submitting comments during RFI or draft RFP periods. If you're preparing for a competition, three steps are worth doing now:
- If you want to compete on cost-type contracts, audit your accounting system first. A DCAA pre-award survey can be requested voluntarily. Passing it before you need it avoids delays at award.
- For every FFP opportunity, read the SOW against the deliverables and ask what happens if the government changes its mind. If the answer is "nothing is specified," request a change clause or price the contingency in.
- Before pursuing an IDIQ vehicle, pull the task order history on USASpending.gov. Look at awarded task orders, not ceiling values. The ceiling tells you almost nothing about what you'll actually earn.
The contract type you sign is a financial structure you'll live with for years. Read it like one.
