Every other industry factors invoices. Construction factors a moving target. Between progress billing, retainage, change orders, lien rights, and a general contractor who pays when the owner pays, a construction receivable is the hardest asset in commercial finance to advance against — which is exactly why most factoring companies quietly decline it. Here's how the ones that don't actually underwrite the file, and what the math really looks like on your next pay application. For the wider front-end picture, start with funding mobilization costs.
Start with the mechanics you already know
The core idea doesn't change by industry: you sell an unpaid receivable to a factor, they advance most of it now, they collect from your payer, and you get the remainder minus a fee. If that's new, read factoring explained on a napkin first — this guide assumes it and goes straight at what construction does to it.
What changes is that in trucking, the invoice is finished the moment the load delivers. In construction, your "invoice" is a claim about how much of a job you completed this month, and at least three other parties get a say in whether that claim is true.
The retainage haircut nobody models
This is the number that surprises contractors more than any other. Retainage — commonly 5% or 10% withheld from every payment until closeout — is contingent money. It depends on final completion, punch list, and sometimes a warranty period. Factors generally will not advance against it at all.
So the advance is calculated on the net-of-retainage amount, not your invoice total. Work it through on a $100,000 pay application with 10% retainage:
| Step | What happens | Cash to you |
|---|---|---|
| Pay app submitted | $100,000 billed, 10% retainage withheld | — |
| Approved amount | $90,000 is the factorable receivable | — |
| Advance | Factor advances 80% of $90,000 | $72,000 |
| GC pays (day ~55) | $18,000 reserve released, less a 2.5% fee ($2,250) | $15,750 |
| Still outstanding | $10,000 retainage, held until closeout | $0 for now |
| Total on that pay app | $87,750 of the $90,000 payable | $87,750 |
A factor funds approved pay applications, not submitted ones
Submitting a pay application is not the same as having a receivable. Most construction factors want the owner's or GC's sign-off — a signed AIA G702/G703 or the project's equivalent — before they advance. That approval window is often two to three weeks on its own, which means factoring compresses the back half of your cycle, not the front.
Practically: factoring doesn't fund day-one mobilization. There's nothing to factor before you've performed work. It fixes the contractor whose problem is that jobs two and three are being funded out of job one's receipts.
Pay-when-paid vs. pay-if-paid — read the subcontract
These two clauses look nearly identical and mean very different things.
Pay-when-paid is generally read as a timing provision: the GC pays you after the owner pays, but within a reasonable time regardless. The owner's delay is your delay; the owner's default is still the GC's problem.
Pay-if-paid attempts to make the owner's payment a condition precedent — if the owner never pays, the GC never owes you. That moves the entire risk of owner insolvency onto the subcontractor.
Enforceability varies a lot by state; some states won't enforce pay-if-paid on public policy grounds, others enforce it when the language is explicit. It matters here because a factor reads that clause before deciding whether your receivable is worth advancing against — and prices it. Have an attorney licensed in the project's state read it before you sign the subcontract, not after the GC goes quiet.
The assignment clause that quietly kills the deal
Factoring requires assigning the receivable to the factor and sending a notice of assignment telling the payer to remit to them. Plenty of subcontracts prohibit assignment without written consent, and some public contracts have their own procedure entirely.
Two things follow. First, check the assignment language on every contract you intend to factor — before award if you can. Second, expect your GC to be told. Some GCs deal with factors constantly and think nothing of it; others treat it as a distress signal. Raising it yourself, early, in a "we use a facility to smooth cash between draws" framing lands far better than a notice of assignment arriving cold in their AP inbox.
Offsets and backcharges: the factor's real fear
The reason construction prices above trucking isn't slow payment. It's that a construction receivable can shrink after it's been advanced. A GC can backcharge you for cleanup, a delay, damage to another trade's work, or a warranty callback. A disputed change order can hang $40,000 of an approved pay app in limbo for months.
That's dispute risk, and factors handle it three ways: lower advance rates, recourse (you buy back an invoice that goes unpaid or disputed), and reserve accounts held longer. Expect construction advance rates to land meaningfully below the 90–95% you see quoted for freight, and expect recourse to be the default.
Lien rights are collateral — don't sign them away for free
Your mechanics lien rights are part of what makes the receivable worth advancing against. Preliminary notices and lien deadlines are strict and state-specific, and missing one can wipe out the security behind the money.
Watch the waivers. A conditional waiver is fine — it's contingent on the payment actually clearing. Signing an unconditional waiver before funds are in hand gives up the claim while you're still unpaid. Factors care about this because it's their collateral too, and a good one will flag it. Don't rely on that; make it your own AP discipline.
When it fits — and when it doesn't
| Your situation | Is factoring the tool? |
|---|---|
| Approved pay apps, creditworthy GC, slow payer | Yes — this is the fit |
| Growing backlog, receivables funding new starts | Yes, alongside a line of credit |
| Day-one mobilization, nothing billed yet | No — nothing exists to factor |
| Residential remodels billed to homeowners | Rarely — consumer payers, weak credit file |
| T&M work with no signed approvals | No — unverifiable receivable |
| Chronic negative margin on every job | No — factoring buys time, not margin |
That last row is the honest one. Factoring is a timing tool. If jobs are losing money, faster access to a shrinking number makes the ending arrive sooner, not later. Fix job costing first.
Six questions to ask before you sign a factoring agreement
- Do you fund construction progress billings specifically? A generic factor saying "sure, we do invoices" is a warning, not an answer.
- What's the advance rate, and is it calculated before or after retainage? Get it in writing with a sample.
- Recourse or non-recourse — and what counts as a dispute? In construction, the dispute definition matters more than the recourse label.
- What's the all-in cost? Fee plus wire fees, lien searches, notice of assignment fees, monthly minimums, and any facility fee.
- What's the term and the exit? Long lock-ins with volume minimums punish you in a slow quarter.
- How do you interact with my GC? Verification calls and notices reach your customer. Know the tone before it happens.
What to have ready
The file that gets underwritten fastest is boring and complete: the signed subcontract or purchase order, the current schedule of values, recent approved pay applications, an accounts receivable aging, a work-in-progress schedule, three to six months of bank statements, and your lien-notice status by job. Same document set that answers what lenders actually check — assembled once, it works for every product you'll ever apply for.
Common questions
Can construction companies use invoice factoring?
Yes, but not with a generic factor. Progress billing, retainage, lien rights, and offset risk are outside what most general factoring companies underwrite. You want a factor that specifically handles construction, and the receivable normally needs to be an approved pay application from a commercial or public payer.
Can you factor retainage?
Almost never in a normal advance. Retainage is contingent on closeout, so factors typically carve it out and calculate the advance on the net-of-retainage amount. Some construction specialists look at it separately near completion at a much lower rate. Plan your cash as if it isn't available.
What's the difference between pay-when-paid and pay-if-paid?
Pay-when-paid is generally a timing clause — the GC pays after the owner does, but within a reasonable time either way. Pay-if-paid tries to make owner payment a condition of your getting paid at all. Enforceability varies by state; have an attorney in the project's state read it before signing.
How much does construction factoring cost?
It's quoted per deal on the payer's credit, their payment history, invoice size, and your volume — and it generally prices above trucking or staffing because of dispute and lien complexity. Compare all-in costs including wire, lien search, notice, and minimum-volume fees, not headline rates.