Progress Billing in Construction, Explained

Progress billing means invoicing for a project in installments as the work advances, instead of one bill at the end. Each period — almost always monthly — the contractor submits a pay application claiming the value of work completed and materials stored so far, the payer (a GC, an owner, or a customer) reviews and certifies it, and payment follows for that slice. On a job of any size this isn't a convenience, it's survival: nobody can carry six months of labor and material cost and collect only at handover.

The mechanics are simple once you see that every application is cumulative. You are never really billing this month in isolation — you are restating the value of everything done to date, and the amount due is whatever hasn't been paid yet.

Progress billing vs. invoicing the whole job

A regular invoice says: here is a thing I delivered, pay this price. A pay application says: the project is now this complete, here is the math on what that's worth, minus retainage, minus everything you've already paid — pay the difference. Three practical consequences follow:

• The document is bigger. A pay application carries a summary page and a schedule of values behind it, because the payer certifies line-by-line progress, not a lump sum.
• The numbers are chained. Each application must pick up exactly where the last certified one ended — the previous-applications figure isn't yours to choose.
• Payment is for earned value, not effort or cost. You are paid the scheduled value of what is verifiably in place, whatever it actually cost you to put there.

The monthly cycle

1. Cutoff. The contract sets a billing date — commonly the 20th or 25th, or month-end. Your application covers work completed through that date, including a good-faith projection for the last few days if you bill slightly ahead of the cutoff.
2. Prepare and submit. Update the percent complete on each schedule of values line, attach whatever backup the contract requires (waivers from the prior period, stored-material documentation, change order approvals), and submit the way the contract says — many payers now require a portal, not email.
3. Review. The payer's reviewer walks the job or checks reports against your claimed percentages. Many GCs encourage a draft (a 'pencil copy') a few days before formal submission so disagreements get settled before anything is signed.
4. Certify. The payer certifies the application — ideally as submitted, sometimes for less if they disagree with a percentage. The certified amount, not the submitted one, is what carries forward.
5. Pay. Payment terms run from certification or from the payer's own receipt of funds, typically putting cash in hand 30 to 60 days after your cutoff.

Percent-complete billing against the schedule of values

The schedule of values — the line-item breakdown of your contract amount, agreed before the first application — is where the month's actual work happens. For each line you assess how complete that activity is, and the line earns that percentage of its scheduled value. The columns then roll forward mechanically: what you billed on previous applications, plus this period, plus materials presently stored, gives completed and stored to date; the line totals sum to the application's work completed & stored to date figure. If percent complete on each line is honest, everything downstream is arithmetic.

The chain rule worth tattooing somewhere: this month's previous-applications column must equal last month's completed-to-date column, line by line, as certified. Break the chain once and every subsequent application inherits the error.

Retainage, briefly

Most contracts let the payer withhold a percentage — typically 5% or 10% — of earned value from every payment until completion. It is computed on the cumulative total, subtracted before payment, and released when the contract's conditions are met. It's why the amount due this application is always a bit less than the month felt like it earned. The full mechanics, including step-downs and stored-material rates, are in our retainage guide; here it's enough to know the deduction happens on every application, including the example below.

A worked example: three periods on a $200,000 contract

Say you hold a $200,000 subcontract with 10% retainage, and the first three months go: $30,000 of work in period 1, $50,000 in period 2, $70,000 in period 3. Here is how the three applications stack:

Notice the chaining: each application's previous-applications figure is exactly the prior application's earned to date, less retainage. And the three amounts due — $27,000 + $45,000 + $63,000 — sum to $135,000, which is precisely the earned-less-retainage total after period 3. The system is self-checking if you let it roll forward properly. Application #2 in full-form layout:

The cash-flow reality for subs

Look at the timing in that example honestly. The $30,000 of period-1 work was paid for — labor weekly, materials on 30-day supplier terms — long before the $27,000 arrived, likely 45 to 60 days after the work started. Meanwhile retainage quietly accumulates: $15,000 held by the end of period 3, roughly a typical margin on the work, parked until closeout. Progress billing narrows the financing gap compared to billing at the end; it does not eliminate it. Which is why the discipline matters: bill every single period, never miss a cutoff, bill stored materials when the contract allows, and treat a skipped month as what it is — an interest-free loan you just extended.

Educational note on pay-when-paid: many subcontracts condition the GC's payment timing (and in some versions, the obligation itself) on the GC first being paid by the owner. Enforceability of the harsher versions varies significantly by jurisdiction. You can't ignore these clauses — but you can read them before signing, and price the float they create.

Frequently asked questions

How often do you bill on a construction project?

Monthly is the overwhelming default, on a cutoff date fixed by the contract. Some short jobs bill at milestones instead, and some owners run four-week cycles — but whatever the rhythm, bill every period you're entitled to. Skipping a month doesn't save effort; it doubles next month's reconciliation and delays cash.

What happens if the payer certifies less than I applied for?

The certified amount governs. Your next application must restate the previous-applications figure at the certified value and carry the disputed percentage honestly — then you re-bill the difference when the disagreement resolves. Keep a written record of what was cut and why; certified-versus-submitted gaps are exactly where roll-forward errors breed.

Can I bill for materials I've bought but not yet installed?

Often yes, through the stored-materials column, if the contract allows it — typically requiring the materials to be suitably stored, insured, and documented (invoices, photos, bills of sale). Once installed, their value moves into work completed. Stored-material billing is one of the best legal cash-flow levers a sub has; use it.

How is progress billing different from milestone billing?

Milestone billing pays fixed amounts when defined events complete — permit issued, rough-in inspected, substantial completion. Progress billing pays continuously on percent complete against a schedule of values, whether or not any milestone landed that month. Percent-complete tracks cash to work more smoothly, which is why commercial construction standardized on it.

What's a pencil copy and should I send one?

A draft application shared informally before formal submission, so the reviewer can flag disagreements while they're still cheap to fix. If your payer offers the practice, use it — a percentage argument settled over a pencil copy costs a phone call; the same argument after submission costs a rejection and a payment cycle.