Retainage, explained: the 10% that's probably your profit
Every month you bill for the work you put in place, and every month the owner pays you a little less than you earned — on purpose, per the contract, with a name for it: retainage. It's the most normal thing in construction and one of the least understood by the people it squeezes. On a typical job, the money held back by the end roughly equals a contractor's entire profit margin — which means the job isn't actually profitable until retainage comes home, and retainage doesn't come home by itself.
What retainage is, and why owners hold it
Retainage (also called retention) is a percentage of each progress payment — commonly 5% or 10%, set by your contract — that the owner withholds until the work is complete. The logic is leverage: a contractor who's been paid 100% for 90% of the work has little financial reason to hurry back for the last punch-list items, the closeout documents, and the callbacks. The held money is the owner's insurance that the job actually gets finished, not just mostly built. Fair or not — and subcontractors, who often carry the same retainage passed down from the GC while having finished their trade months before project completion, have opinions — it's the standard mechanism on commercial work and much public work. The percentage, any reduction, and the release conditions are all creatures of your contract (and, on public jobs, of state statute), so the numbers below are the common pattern, not a rule.
The math, on one job
Take a $500,000 contract with 10% retainage. In a month where you complete $60,000 of work per your schedule of values:
| This month's application | Amount |
|---|---|
| Work completed this period | $60,000 |
| Retainage withheld (10%) | −$6,000 |
| Payment due this month | $54,000 |
No single month hurts much. The accumulation is the story: bill the full contract at 10% and by the end the owner is holding $50,000 of money you've earned. Now put that next to your margin — if you priced the job at, say, 8% profit, that's $40,000, meaning everything you'll ever make on this job plus some of your overhead recovery is sitting in the owner's account, waiting on paperwork. That's the sentence every estimator and every project manager should keep taped to the monitor: on a typical retainage job, profit is a closeout event, not a monthly one. Cash-flow planning has to treat it that way too — the money that funds your payroll during the job is your cost reimbursement, not your margin.
The wrinkles worth knowing
- Retainage on stored materials. When you bill for materials delivered but not yet installed, retainage typically applies to those too — the withholding follows the billing, not the installation.
- Reduction at the midpoint. Many contracts (and some statutes) reduce or stop retainage once the job passes 50% complete and is on schedule — e.g. 10% held on the first half, 0% on the second, netting 5% overall. It's often negotiable before signing and rarely after. If your contract allows a reduction, calendar it; owners don't volunteer it.
- Subcontractor flow-down. GCs usually hold the same retainage on subs that the owner holds on them — sometimes longer, since sub retainage often waits for project completion, not trade completion. If you're a sub, the release trigger in your subcontract is worth reading twice.
- Release is usually staged. A common pattern: a large share released at substantial completion (with an amount held against the punch list), the remainder at final completion — after the punch list is cleared and closeout documents are delivered. Warranties, O&M manuals, as-builts, lien waivers: the boring paperwork is literally what your $50,000 is waiting on.
Track it like the asset it is
Because retainage accrues a little every month, it hides. The fix is the same one that works everywhere else in the office: it's a running column, not a memory. Every payment application should show work completed, retainage withheld this period, retainage held to date, and the balance to finish — so the "money of yours they're holding" number is always current and always visible, and so your application always foots (owners' reviewers reject pay apps for arithmetic before anything else). That's precisely what a schedule-of-values-driven payment application does: the SOV carries the line items, each month's application computes work-in-place, stored materials, retainage, and payment due, and the retainage-held-to-date total stops being a surprise at closeout — it's been on page one all along.
The pay app that does the retainage math for you
The Construction Payment Application + Schedule of Values is an AIA-style progress-billing workbook: build your SOV once, then each month's application computes work completed, stored materials, retainage withheld and held-to-date, and payment due — with every total footing against the contract sum, and approved change orders flowing through. Pure formulas, no macros, Excel.
Last honesty note: retainage terms — the percentage, reductions, deadlines for release, and interest on late release — are set by your contract and, especially on public work, by state law, and both vary widely. This article is the working concept, not legal advice; the specifics live in your agreement, and a construction attorney is the right reader for the ones that matter. What doesn't vary: the held money is yours, it's probably your profit, and the paperwork that frees it deserves the same urgency as the work that earned it.