Paid for Work Not Yet Done: Progress Payments and the Billing Lines You Cannot Cross

Published 2026 | TIKC NewsWire

Cash flow is the quiet killer of growing contractors, so the ability to get paid along the way, rather than only at final delivery, is a lifeline. Progress payments, performance-based payments, and interim cost vouchers all let money come in while the work is still underway. That access comes with a condition that is easy to rationalize away under financial pressure: every interim bill must honestly reflect the costs you have incurred and the work you have actually done. The moment you bill ahead of reality, a cash-flow tool turns into a fraud exposure.

How interim payments work

There are a few common mechanisms. Progress payments on fixed-price work are typically based on costs incurred as the work proceeds, paid as a percentage. Performance-based payments are tied to the achievement of defined events or milestones. On cost-reimbursement and time-and-materials work, you submit interim vouchers for costs and hours as you go. All of them share a common logic: the government advances money against a representation that the underlying costs, progress, or milestones are real.

Where interim billing goes wrong

The danger is that the representation drifts from the truth. The classic problems include front-loading, billing a disproportionate share of costs early to pull cash forward, claiming milestones that have not actually been achieved, billing costs not yet incurred, and charging costs that are unallowable or belong to a different contract. Each of these inflates an interim claim, and because the government relies on that claim to release funds, each can be a false claim. Intent matters, but reckless indifference to whether the bill is accurate is enough under the False Claims Act.

The temptation is the trap

What makes this area dangerous is that the pressure feels legitimate. A milestone is almost done, payroll is due, and billing a week early seems harmless because the work will be finished soon. But almost done is not done, and soon is not now. The government did not agree to fund your optimism. When a milestone slips or a cost does not materialize as billed, you are left holding money you represented you had earned. That gap is precisely what auditors and relators look for, and good intentions do not erase a false certification.

Keep the billing honest and provable

The defense is a billing process tied tightly to reality. Bill only costs actually incurred and milestones actually achieved, supported by records you could hand an auditor without flinching. Keep contract costs segregated so you never bill one contract for another’s costs. Screen out unallowable costs before they hit an invoice. And if you discover you were overpaid on an interim basis, treat it as an obligation to return, not a windfall to keep, which also keeps you clear of reverse-false-claims and overpayment problems.

What to do now

• Bill only what is real. Interim claims must reflect costs incurred and milestones genuinely achieved.
• Do not front-load. Pulling cash forward by overstating early costs is a classic false-claim pattern.
• Segregate contract costs. Never let one contract’s costs be billed to another.
• Screen unallowables. Keep disallowed costs out of every interim voucher.
• Return overpayments. If an interim payment outran the work, give the excess back promptly and document it.

Getting paid as you go is a privilege that rests entirely on the honesty of each bill. Invoice the truth, keep the records, and your cash flow never becomes your liability. Brick by brick.

FAQ

What are progress payments?

Interim payments on fixed-price work, typically based on costs incurred as the work proceeds and paid as a percentage, so a contractor is not waiting until final delivery to be paid.

How do performance-based payments differ?

They are tied to the achievement of defined events or milestones rather than a percentage of costs. Claiming a milestone you have not met is a false representation.

What interim-billing practices create False Claims Act risk?

Front-loading costs, claiming unachieved milestones, billing costs not yet incurred, and charging unallowable or mischarged costs. Reckless indifference to accuracy is enough for liability.

What if I was overpaid on an interim bill?

Treat it as an obligation to return promptly, not a windfall. Keeping a known overpayment can create reverse-false-claims and overpayment exposure.

Sources

Federal Acquisition Regulation. (2026). Subpart 32.5, Progress Payments, and Subpart 32.10, Performance-Based Payments.

U.S. Department of Justice. (2026). False Claims Act enforcement involving progress and interim billing.

This article is general information, not legal advice.