What Is a Construction Holdback? Retainage, Release, and Tax Rules

A construction holdback is a slice of each progress payment that the property owner keeps back from the contractor until the project is finished, the punch list is cleared, and no one down the chain has an unpaid claim against the property. In the United States the same practice is usually called retainage, and the withheld share typically runs between 5% and 10% of the value of work completed in each billing cycle.¹ The point is leverage: construction gets paid before anyone can fully judge the work, and the holdback gives the owner something to draw on if the contractor walks away, delivers defective work, or fails to pay subcontractors and suppliers who could otherwise lien the property.

How the Percentage Works

The holdback rate is set in the construction contract before any work begins, and it applies to every approved progress billing. If a contractor submits a $200,000 payment application and the contract calls for 10% retainage, the owner pays $180,000 and keeps $20,000. The next billing works the same way, and the retained amounts stack up in a fund that the owner holds for the duration of the job.¹

Many contracts reduce the rate partway through the job. A common structure cuts the withholding rate in half once the project reaches 50% completion, or stops new withholding at substantial completion while leaving the accumulated balance in reserve.¹ The reasoning is practical. Past a certain point the owner already holds enough to cover realistic risks, and continuing to withhold just drains the contractor’s working capital.

Caps vary by jurisdiction and project type. Most states now limit retainage on public work to 5%, and a growing number apply the same ceiling to private commercial projects. Private-project caps generally sit between 5% and 10%, with the lower end becoming more common in recent legislation. Federal construction contracts cap retainage at 10% under FAR 32.103, and the contracting officer is expected to withhold nothing when progress is satisfactory.²

How the Holdback Flows Down to Subcontractors

Retainage doesn’t stop at the top of the chain. The owner holds back from the general contractor, and the general contractor in turn holds back the same percentage from every subcontractor and major supplier. The concrete sub, the electrician, the plumber, the steel fabricator — each one has a share of their earned pay sitting in someone else’s account.

That creates a stacking problem. A subcontractor usually can’t collect their retainage until the general contractor collects from the owner, and the general contractor can’t collect until the project clears its completion milestones. A sub who finishes their scope in month three of a two-year job may wait another 20 months to see the balance. For a smaller firm running five concurrent projects, each holding $50,000, that’s a quarter-million in earned-but-inaccessible cash — money that can’t cover payroll, materials, or equipment.

Many state statutes treat holdback funds as trust money held for the benefit of the subs and suppliers on that specific project. Where that rule applies, the party holding the retainage can’t commingle it with operating funds or spend it on another job. Some states go further and require the money to sit in an interest-bearing escrow account, with the interest running to the contractor.

When the Money Gets Released

The key milestone is substantial completion: the point at which the project is finished enough that the owner can occupy it or use it for its intended purpose, even though minor items remain. A Certificate of Substantial Completion formally documents that moment and shifts responsibilities like insurance and utilities to the owner.

Substantial completion is not final completion, and the holdback usually doesn’t get released until final completion. Final completion means every contract item is done, every deficiency has been corrected, every punch list item is closed, and all conditions for final payment have been satisfied.³ Between those two points the contractor and the owner’s architect walk the job, document every remaining defect — a scuffed wall, a crooked switch plate, a door that won’t latch — and the contractor fixes each one.

In many states the owner then files a Notice of Completion with the county records office. That filing starts a statutory countdown during which any unpaid subcontractor or supplier must file a mechanic’s lien or lose the right. The retainage can’t safely be released until that window closes with no claims pending, so the general contractor collects final lien waivers from every major sub and supplier confirming they’ve been paid or will be paid from the final disbursement.

State prompt payment acts then set a deadline for the actual release, typically between 10 and 60 days from the triggering event. Miss the deadline and the owner or GC faces interest penalties that commonly run between 10% and 24% per year on the unreleased amount, and many of these statutes also award attorney’s fees to a contractor who has to sue to collect. On federal jobs the prime contractor must pass each subcontractor’s share along within seven days of receiving payment from the government, and late payment triggers interest at the Treasury’s published rate.⁴

One boundary worth knowing: you can’t file a mechanic’s lien against federal property. On federal jobs the Miller Act instead requires performance and payment bonds on any contract over $100,000, and unpaid subs make claims against the payment bond rather than the land itself.⁵

When an Owner Can Keep Withholding Past the Deadline

Owners and general contractors can hold retainage past the normal release point, but only for specific, documented reasons. The usual bases are unfinished or defective work the contractor hasn’t corrected after being given the chance to fix it, and a valid mechanic’s lien filed by an unpaid sub or supplier — in that case the owner needs the reserve to resolve the claim.

Notice rules are strict. On federal projects, 31 U.S.C. § 3905 requires written notice to the affected party and a copy to the contracting officer when any amount is being withheld.⁴ State prompt payment acts generally demand the same thing: written notice stating the exact dollar amount held and the reason. Skip the notice and the right to withhold can evaporate, with penalty interest attaching to the full amount.

This is where disputes most often go sideways. An owner holds back $150,000 claiming the HVAC system is out of spec; the contractor says the system is fine and the owner is slow-paying. Without clear written notice tying the money to a specific defect and dollar amount, the owner’s position weakens fast. Most construction contracts route these fights through mediation first, then binding arbitration, which is usually faster and cheaper than litigation.

Alternatives That Keep the Cash Moving

Contractors who don’t want their money sitting in someone else’s account have a few options, though not every owner will accept them.

A retainage bond, in which a surety company issues a bond that stands in for the withheld cash. If the contractor fails to perform, the owner claims against the bond instead of the retainage fund.
A letter of credit from a bank, which guarantees payment of a specified amount if the contractor defaults. The owner can draw on it the same way they’d draw on retained funds, and the contractor keeps the cash.
A joint escrow account, where the retainage goes into a bank account controlled by both parties rather than the owner alone. The funds earn interest, and there’s an added layer of protection against misuse. Some states require this on public projects.

The federal Prompt Payment Act expressly recognizes that bonding can substitute for cash retainage, and tells prime contractors to give recognition to whether a subcontractor can furnish performance and payment bonds when negotiating retainage terms.⁴ On private jobs, owners are often reluctant to accept alternatives unless the contractor has a strong track record, but the conversation is worth having on larger projects where the withheld sums get significant.

A Tax Trap Worth Knowing

Retainage creates a timing question at tax time: do you owe tax on money you’ve earned but haven’t received? It depends on your accounting method and the type of contract.

For accrual-basis contractors on standard, non-long-term contracts, IRS Revenue Ruling 69-314 allows deferral. The contractor doesn’t have a fixed right to the retainage until the contractual conditions for release are met, so the income isn’t reported until final acceptance.⁶

Long-term contracts under the percentage-of-completion method in 26 U.S.C. § 460 work differently. Income is recognized based on the ratio of costs incurred to estimated total costs, and retainage is folded into the total contract price for that calculation.⁷ On a large multi-year job, that means owing tax on retainage before you’ve collected it. A construction-focused accountant can help structure timing and elections to soften the hit.

1
ConsensusDocs. Retainage What Contractors Need to Know and Helpful Strategies
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Acquisition.GOV. FAR 32.103 Progress Payments Under Construction Contracts
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Acquisition.GOV. GSAM 552.211-70 – Substantial Completion
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Office of the Law Revision Counsel. 31 USC 3905 – Payment Provisions Relating to Construction Contracts
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Office of the Law Revision Counsel. 40 USC 3131 – Bonds of Contractors of Public Buildings or Works
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Internal Revenue Service. Construction Industry Audit Technique Guide
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Office of the Law Revision Counsel. 26 USC 460 – Special Rules for Long-Term Contracts