Federal Contract Types Explained, Firm-Fixed-Price, Time-and-Materials, Cost-Reimbursement and IDIQ for Small Businesses
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What firm-fixed-price, time-and-materials, labor-hour, cost-reimbursement and IDIQ contracts mean for a small business, and how to spot the type before you bid.
Two federal solicitations can ask for almost the same work and still put very different risks on your business, because they use different contract types. On one, you promise a single price and keep whatever is left after your costs. On another, you bill hourly rates up to a ceiling. On a third, you are paid your allowable costs plus a fee, but only if your books can prove those costs. This article walks through the contract types a new small federal contractor is most likely to run into, what each one means for your cash and your risk, and where in a solicitation to look so you know which one you are bidding on.
Every rule cited here was read on the date of this post on acquisition.gov, which currently shows the Federal Acquisition Regulation (FAR) at FAC 2026-01 with an effective date of March 13, 2026. This is a plain-language overview, not legal advice, and the terms of each solicitation control.
The big picture from FAR Part 16
Contract types live in FAR Part 16. The opening section, FAR 16.101, explains that contract types vary by how much responsibility the contractor takes on for the costs of performance and by the kind of profit incentive it gets for hitting or beating goals. It groups them into two broad families, fixed-price and cost-reimbursement, and describes a range that runs from firm-fixed-price, where the contractor has full responsibility for costs and the resulting profit or loss, to cost-plus-fixed-fee, where the contractor has minimal responsibility for costs and its fee is fixed. Incentive contracts sit in between.
The government does not pick a type at random. FAR 16.103 says selecting a contract type is generally a matter for negotiation and should be considered together with price. It also says a firm-fixed-price contract shall be used when the risk involved is minimal or can be predicted with an acceptable degree of certainty, and that contracting officers should avoid protracted use of cost-reimbursement or time-and-materials contracts once experience gives a basis for firmer pricing. In other words, fixed price is the default the rules lean toward, and other types need a reason.
Firm-fixed-price, the type you will see most
Under FAR 16.202-1, a firm-fixed-price contract provides for a price that is not adjusted based on the contractor's cost experience in performing the contract. The same section says it places maximum risk and full responsibility for all costs and the resulting profit or loss on the contractor, gives the maximum incentive to control costs, and imposes a minimum administrative burden on both sides.
That last part is why firm-fixed-price work is often the friendliest place for a small business to start. You do not need a government-grade cost accounting system to bill it, and you are not reporting every hour back to the agency. You deliver what the contract describes and invoice the agreed price. The trade-off is that if your estimate is wrong, the loss is yours.
FAR 16.202-2 says firm-fixed-price contracts suit commercial products and commercial services, and other supplies or services with reasonably definite specifications, when the contracting officer can establish fair and reasonable prices at the outset, for example when there is adequate price competition. For commercial buys the rule is tighter still. FAR 12.207 says agencies shall use firm-fixed-price contracts or fixed-price contracts with economic price adjustment for commercial products or commercial services, with a narrow exception for time-and-materials and labor-hour contracts on certain commercial services.
Here is a hypothetical example. A small janitorial company bids a firm-fixed-price contract to clean a federal office building five nights a week for a year at a single monthly price. Halfway through the year its supply costs go up and one employee quits, so it pays overtime to cover. None of that changes the monthly price. The company's protection was in the bid itself, which is why our post on how to price a federal bid spends so much time on building an honest estimate before you commit.
Time-and-materials and labor-hour contracts
A time-and-materials contract, described in FAR 16.601, pays for direct labor hours at specified fixed hourly rates that include wages, overhead, general and administrative expenses and profit, plus the actual cost of materials. A labor-hour contract, under FAR 16.602, is the same thing except the contractor does not supply materials.
These contracts are meant for uncertain work. FAR 16.601 says one may be used only when it is not possible, at the time of placing the contract, to estimate accurately the extent or duration of the work or to anticipate costs with any reasonable degree of confidence. Because the rule itself notes that this type gives the contractor no positive profit incentive for cost control or labor efficiency, it requires appropriate government surveillance of performance. It also limits use to cases where the contracting officer signs a determination and findings that no other contract type is suitable, and it requires a ceiling price that the contractor exceeds at its own risk.
That ceiling is the part to underline. Your profit is built into each hourly rate, so every hour you bill earns some margin, but if the work runs past the ceiling and the government has not raised it, the extra hours are on you. Before the contracting officer can raise a ceiling, FAR 16.601 requires an analysis of pricing and other factors and documentation of the decision, so do not assume an increase will be quick or automatic. As a hypothetical, a two-person IT firm that wins a labor-hour order for help desk support should track billed hours against the ceiling every week and warn the contracting officer well before it gets close, rather than discovering the problem on the last invoice.
Cost-reimbursement contracts
Cost-reimbursement contracts pay allowable incurred costs to the extent the contract prescribes, usually with a fee on top. One common version is cost-plus-fixed-fee. FAR 16.306 describes it as paying a negotiated fee that is fixed when the contract starts and does not vary with actual cost, though it may be adjusted for changes in the work. The same section says this type permits contracting for efforts that might otherwise be too risky for contractors, such as research or preliminary exploration where the level of effort is unknown, but gives only a minimum incentive to control costs.
For a new small business the key rule is in FAR 16.301-3. It says a cost-reimbursement contract may be used only when, among other conditions, the contractor's accounting system is adequate for determining the costs applicable to the contract or order. The same section flatly prohibits cost-reimbursement contracts for commercial products and commercial services. So if your bookkeeping is a single checking account and a spreadsheet, cost-type work is probably not where you start. If you want to grow toward research, engineering or large services programs, it is worth talking early with an accountant who knows federal work about what an adequate system would take for your company.
IDIQ contracts and task orders
Indefinite-delivery, indefinite-quantity contracts, usually called IDIQs, are less a pricing type than a way of buying. FAR 16.501-2 explains that indefinite-quantity and requirements contracts are also known as task-order or delivery-order contracts, and that indefinite-delivery contracts can use any appropriate pricing arrangement under Part 16. That means the individual orders under an IDIQ can themselves be firm-fixed-price, time-and-materials or something else, so you have to read both the base contract and each order.
FAR 16.504 sets the basics. The contract must require the government to order, and the contractor to furnish, at least a stated minimum quantity, and that minimum must be more than a nominal quantity. Above the minimum, the government places orders as needs arise, up to a stated maximum. The rule also says contracting officers must, to the maximum extent practicable, give preference to making multiple awards of indefinite-quantity contracts for the same or similar work.
This is the part that surprises first-time winners. Getting a spot on a multiple-award IDIQ usually guarantees only the minimum. The real money comes from competing for task orders among the other awardees, which is a second round of bidding. A hypothetical small engineering firm that lands one of six awards on an agency IDIQ should budget as if only the guaranteed minimum will arrive, and treat each later task order request as its own proposal. Our guide to eBuy, OASIS+ and IDIQs covers how those order competitions tend to reach vendors.
How to tell which type you are bidding on
You usually do not have to guess. On a uniform contract format solicitation, the schedule of supplies or services in Section B normally shows how each line item is priced, and Section H or Section I lists the clauses that go with the type, such as a ceiling price clause on time-and-materials work. Commercial solicitations often state the contract type in the instructions or the schedule. If you are new to reading these documents, our post on reading Sections L and M and the walkthrough on reading a SAM.gov contract notice show where to look. If the type still is not clear, ask the contracting officer through the question process the solicitation sets, before the question deadline.
A useful habit is to write the contract type at the top of your bid and no-bid notes for every opportunity you review. Then ask three questions. Can we estimate this work well enough to commit to a fixed price? If it is hourly, can we live within the ceiling? If it is cost-type, can our accounting system support it? Small, simplified buys are a good training ground, and our post on micro-purchases and simplified acquisitions explains where many of them come from.
When you are ready to look at real notices, browse our total small business set-aside listings or the full set-aside listings, and check each one against the questions above. Every notice links back to the original on SAM.gov, where the attachments carry the contract terms. For outside help, SBA's page on how to win contracts points to its federal marketplace resources, and the SBA local assistance finder lists free counseling near you. If you are weighing a GSA schedule, GSA's Multiple Award Schedule page explains that program in its own words.
Helpful reading. For more on this topic, see government contract basics books (Affiliate link) and government contracting for small business books (Affiliate link). As an Amazon Associate I earn from qualifying purchases.
The Set-Aside Desk is published by SetAside Signal, an independent publication, not a government agency. This article isn't legal advice; rules change, so confirm details with the official sources: SBA (sba.gov), SAM.gov and the FAR at acquisition.gov. Published Nov 2, 2026.