What Is a Not to Exceed Price in Contracts?

A not-to-exceed price in contracts is a hard dollar ceiling on what a contractor can bill, paired with billing based on actual hours worked and materials purchased. The contractor invoices real costs as they accumulate, and the client pays those costs up to the cap. Crossing the cap requires a written modification. If the work finishes under the ceiling, the client pays only what was spent and keeps the rest.

This structure shows up constantly in federal contracting and increasingly in private construction and consulting work, where the scope is clear enough to set a budget but uncertain enough that a flat fee would force one side to gamble.

How the Billing Actually Works

Under a not-to-exceed arrangement, the contractor tracks labor hours and material expenses and bills them at pre-agreed rates. The client pays those actual costs up to the ceiling price written into the contract. Federal Acquisition Regulation 16.601 sets out the underlying time-and-materials structure and requires that every such contract “include a ceiling price that the contractor exceeds at its own risk.”¹ That single sentence captures the risk allocation. The client is protected from overruns. The contractor absorbs any costs above the cap.

When a project finishes under budget, the client keeps the difference. FAR 52.232-7 says the government “will not be obligated to pay the Contractor any amount in excess of the ceiling price,” and the contractor is “not obligated to continue performance if to do so would exceed the ceiling price.”² Both sides get a clear stopping point. The contractor doesn’t work for free, and the client doesn’t pay for hours that weren’t worked.

How It Differs From Fixed-Price and GMP Contracts

Not-to-exceed pricing is often confused with firm-fixed-price contracts and guaranteed maximum price (GMP) contracts. The differences determine who keeps savings and who absorbs risk.

A firm-fixed-price contract locks the price before work begins. If the contractor finishes for less, they pocket the savings. If costs balloon, the contractor eats the loss. The client pays the agreed price either way.

A not-to-exceed contract pays actual costs up to the ceiling. Savings stay with the client by default. The contractor bears the risk of overruns but has no upside if the project comes in cheap.

A guaranteed maximum price contract also sets a ceiling, but in construction it commonly includes a shared-savings clause that splits the difference between actual cost and the cap. That gives the contractor a financial reason to finish under budget.

So if you want all savings below the cap to stay with you, a not-to-exceed structure does that automatically. If you want the contractor actively driving costs down, consider a GMP with shared savings, or add a shared-savings clause to the not-to-exceed deal.

What a Workable Not-to-Exceed Agreement Needs

A dollar cap alone is not enough. Vague scope language is where most disputes start, because anything not clearly included can be argued as out-of-scope, and anything not clearly excluded can be argued as in-scope. At a minimum, the agreement should pin down:

A detailed scope of work. Specific tasks, deliverables, and performance standards covered by the ceiling price. The more concrete, the fewer arguments later about what counts.
A rate schedule. Fixed hourly rates for each labor category. Under FAR 52.232-7, hourly rates include wages, indirect costs, general and administrative expenses, and profit, and fractional hours are prorated.²
Reimbursable expense definitions. Which direct costs (travel, specialized equipment, subcontractor fees) are billable on top of labor, and which are folded into the hourly rate.
A change order process. The exact steps required to raise the ceiling. Federal modifications typically go through Standard Form 30. Private contracts should spell out who can authorize changes and whether verbal approvals count, which they usually don’t.³
A cost notification threshold. The point at which the contractor must warn the client that the ceiling is approaching. Federal cost-reimbursement contracts require written notice when expected costs will exceed 75 percent of the estimate within the next 60 days.⁴
Audit rights. Because the bill depends on actual costs, the client needs the ability to verify them. FAR 52.215-2 requires federal contractors to keep records available for examination until three years after final payment, with the clock resetting after an early termination and staying open for active disputes. Private contracts should include a similar clause; without one, the client’s ability to challenge questionable charges drops significantly.⁵

What Happens When Costs Hit the Ceiling

This is where not-to-exceed contracts get uncomfortable. As accumulated charges approach the cap, the contractor has three options: stop work, absorb additional costs out of pocket, or negotiate a ceiling increase. There is no fourth option where the contractor keeps working and bills past the cap.

Under FAR 52.232-7, the contractor is not obligated to continue performance beyond the ceiling price, and the government has no obligation to pay above it.² The only way to keep work going is a written modification from the contracting officer raising the ceiling. Courts interpret the cap strictly. A contractor who blows past it without written authorization is absorbing those costs. Verbal assurances from a project manager don’t count. In commercial contracts, the modification generally must come from whoever the agreement designates as having authority to approve changes.

One nuance is worth knowing. If the ceiling is raised after the contractor has already exceeded it, FAR 52.212-4 (Alternate I) provides that hours and material costs incurred above the old ceiling before the increase are “allowable to the same extent as if they had been incurred after the increase.”⁶ A retroactive ceiling increase can cover costs already incurred. The contractor still takes real risk by continuing work before that written increase arrives.

Shared Savings as an Optional Variant

A standard not-to-exceed arrangement returns all savings to the client. Some contracts, particularly in construction, add a shared-savings incentive that splits the under-run between the parties. For federal Construction-Manager-as-Constructor contracts, the contractor’s share of savings runs from 30 to 50 percent, depending on project complexity and the risk the contractor shouldered.⁷ Higher risk justifies a bigger slice.

Adding this clause changes the contractor’s incentives. Without one, the contractor has no particular reason to find efficiencies; they get paid for actual hours either way, just not above the cap. With one, finishing under budget puts money in their pocket.

Invoicing and Getting Paid

Invoicing under a not-to-exceed contract demands more documentation than a standard flat-fee bill, because every charge must tie back to a verifiable cost. FAR 52.232-7 lays out the substantiation requirements for federal time-and-materials contracts, and those requirements work as a practical template for commercial work too.²

Each invoice should include the contract and order number, the billing period, labor hours broken out by the categories in the rate schedule, timekeeping records for those hours (or evidence that employees meet the qualifications for their billed category), actual material costs supported by receipts or supplier invoices, subcontractor charges with the same timekeeping substantiation, and a cumulative total showing that charges to date remain below the ceiling.

Federal time-and-materials vouchers can be submitted no more than once every two weeks, though small businesses may receive more frequent payments.²

After submission, the client reviews the invoice against project logs, progress reports, and the rate schedule. If the contract doesn’t specify a payment date, the default under the Prompt Payment Act is 30 days after receipt of a proper invoice. Construction progress payments carry a tighter window: interest accrues if an approved payment sits unpaid for more than 14 days. If the reviewer finds discrepancies, payment stalls until the contractor provides corrected documentation. Improper invoices must be returned within seven days with a written explanation, and those return days reduce the government’s available payment window.⁸

When the government misses a payment deadline on a federal contract, interest accrues automatically. For the first half of 2026, the Prompt Payment Act rate is 4.125 percent per year.⁹ Interest runs from the day after the required payment date through the day payment is made. The rate resets every six months based on Treasury bill auction results, so it can shift on contracts spanning multiple periods.

Revenue Recognition and Tax Treatment

Because the final contract value isn’t known until the work is done, the revenue a contractor can book at any given point depends on both the accounting framework and the tax method in use.

For financial reporting, not-to-exceed contracts fall under the variable consideration rules of ASC 606. The ceiling creates uncertainty about the total transaction price, so the contractor estimates the amount they expect to earn and can only recognize revenue to the extent that a significant reversal is unlikely when the uncertainty resolves. As the project progresses and the final cost becomes clearer, the contractor updates that estimate each reporting period. Projects with high external uncertainty, such as volatile material prices or heavy third-party dependencies, face a tighter constraint on how much revenue can be booked early.

For tax purposes, the IRS has no rules specific to not-to-exceed contracts. Income recognition follows the contractor’s overall accounting method. Cash-method taxpayers report income when payment is received. Accrual-method taxpayers report it when all events have occurred that fix the right to receive income and the amount can be determined with reasonable accuracy.¹⁰ For most accrual-method contractors, that means income gets recognized as invoices are approved, not when the contract closes. Advance payments for services are generally taxable in the year received, though accrual-method taxpayers can defer them to the following tax year under certain conditions.

1
Acquisition.GOV. FAR 16.601 Time-and-Materials Contracts
2
Acquisition.GOV. FAR 52.232-7 Payments Under Time-and-Materials and Labor-Hour Contracts
3
Acquisition.GOV. FAR 43.201 General
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Acquisition.GOV. FAR 52.232-20 Limitation of Cost
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Acquisition.GOV. FAR 52.215-2 Audit and Records – Negotiation
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Acquisition.GOV. FAR 52.212-4 Contract Terms and Conditions – Commercial Products and Commercial Services
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eCFR. 48 CFR 536.7105-5 Shared Savings Incentive
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Office of the Law Revision Counsel. 31 USC 3903 – Prompt Payment
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Federal Register. Prompt Payment Interest Rate; Contract Disputes Act
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Internal Revenue Service. Publication 538, Accounting Periods and Methods