etainage in Construction: How to Manage the Cash Flow Gap
Retainage is the share of each progress payment an owner holds back until the job is finished, commonly 5 to 10 percent depending on the state and the contract. The work is done, the invoice is approved, and a slice of the money stays with the owner anyway. On a long project that slice sits in someone else's account for months. On jobs with a contested punch list it can sit there for a year or more.
For most contractors this is the largest block of earned money they cannot touch, and it comes straight out of the part of the balance sheet that pays for payroll and materials. It is also awkward to borrow against. In the US, specialty business funders underwrite against monthly deposits rather than against the project itself, which matters here because retainage is usually carved out of invoice-based facilities. Money that is withheld and still contingent on final approval is difficult to lend against directly, so the gap generally gets covered by general working capital rather than by anything secured on the retained amount.
What retainage actually costs
The percentage sounds small. Run it across a full book of work and it stops sounding small.
Consider a hypothetical subcontractor turning over $2 million a year across four or five jobs, with 5 percent held on each. That is roughly $100,000 of earned revenue permanently in transit, because as one project releases its retainage another project starts withholding. The balance never really returns to zero. It behaves less like a receivable and more like a standing reduction in working capital, funded out of the contractor's own pocket for as long as they keep operating at that volume.
Set that against the margins the trade actually runs on. A contractor working at a 4 percent net margin with 5 percent withheld has handed back more than the entire profit on the job and gets it returned only after final approval. Everything they earned is sitting in the owner's account while they pay their crew from somewhere else.
New York changed the rules twice
New York has moved on this recently, and the second move is easy to miss.
In November 2023 the state amended its Prompt Payment Act to cap retainage at 5 percent on private construction contracts of $150,000 or more, replacing the old standard that allowed owners to hold a vaguely defined reasonable amount. The same amendment let contractors submit a final invoice on reaching substantial completion rather than waiting for every last obligation to be discharged.
That reform had a gap. Because the cap was not listed among the contract terms the statute declares void, owners and general contractors could still write higher retainage into an agreement and rely on the general principle that contract terms supersede the Act. In December 2025 the legislature closed it. Under Section 757 of the General Business Law, a contract provision requiring retainage above 5 percent of the contract sum is now void and unenforceable outright.
Two related points are worth knowing. Retainage must be released no later than 30 days after final approval of the work, and an owner who fails to release it on time is subject to interest at 1 percent per month from the date it was due. The rules apply to private projects at or above the $150,000 threshold. Public work sits under a separate regime, and some residential work falls outside the article entirely, so check which set applies before relying on any of it.
Why retainage is harder to finance than an ordinary invoice
An approved invoice is a fairly clean asset. Someone owes you a defined sum on a defined date, and there is a well-developed market for advancing against it.
Retainage is different in kind. It is contingent on final approval, it can be reduced by backcharges and punch list disputes, and its release date frequently moves. Most invoice-based facilities exclude it for exactly those reasons, which surprises contractors who assume their factoring arrangement covers the whole contract value. Read the eligibility criteria on any facility you already have and find out whether retained amounts are in or out before you plan around them.
The practical result is that retainage tends to be financed the same way as any other structural gap between money out and money in, through working capital that is underwritten on the business rather than on the specific receivable.
Five ways to manage the gap
Track it as its own line. Most contractors can state their receivables total instantly and have to go digging for their retainage total. Put it on the dashboard, broken out by job and by expected release date. You cannot plan around a number you have to reconstruct.
Price it in. If you are going to fund 5 percent of the contract for eight months, that has a cost, and it belongs in the bid the same way material and insurance do. Contractors absorb it out of habit and then wonder why the big jobs returned less than the small ones.
Negotiate the rate and the trigger. Both are negotiable more often than people assume. Common asks include stepping retainage down to half once the job passes 50 percent completion, tying release to substantial completion rather than final completion, and agreeing a defined punch list process with a deadline attached.
Invoice for it the day you are entitled. Interest and release clocks generally start from a triggering event, not from the day someone gets round to raising the paperwork. Delay on your side is free money for whoever is holding the balance.
Arrange capital before the crunch, not during it. Terms are better while the numbers look calm, and a contractor with a facility already in place can bid on work that a competitor has to turn down. Be honest about the cost of the money and make sure the repayment rhythm matches how you actually get paid rather than how you hope to.
What to check in the contract
Look for the retainage percentage, whether it reduces at a defined milestone, what event triggers release, how long the owner has after that event, whether interest accrues on late release, and whether the same terms flow down to your subcontractors or leave you holding a mismatch. That last one catches people out. Holding 5 percent from your subs while an owner holds 10 percent from you means you are financing the difference across every job you run.
Have a construction attorney read the payment provisions before signing anything substantial. Retainage clauses are short, they are easy to skim, and they determine how much of your own money you are lending to the project.
FAQ
What is retainage in construction? It is a percentage of each progress payment withheld by the owner until the project reaches completion, held as security that the work will be finished and any defects corrected. It is standard practice on commercial construction across the US.
How much retainage can be withheld? It varies by state and by whether the project is public or private. Five to ten percent is the common range. New York now caps it at 5 percent on private contracts of $150,000 or more, and a clause purporting to require more than that is void.
When does retainage have to be released? That depends on the contract and the governing statute. Under New York's Prompt Payment Act, release is due no later than 30 days after final approval of the work.
Can I charge interest if retainage is released late? In many states, yes, where a prompt payment statute applies. New York provides for interest at 1 percent per month from the date the retained amount was due. Whether pursuing it is worth the relationship cost is a separate judgment.
Can I borrow against retainage? Rarely on a direct basis. Because the amount is contingent and the release date is uncertain, most invoice-based facilities exclude retained sums. Contractors usually cover the gap with general working capital instead, underwritten on the business rather than on the retained balance.
Should retainage be built into a bid? It should at least be considered. Funding a percentage of the contract sum for the length of the job carries a real cost, and treating that cost as a normal line item rather than an afterthought is what separates contractors who grow profitably from those whose best year is also their tightest.