Retainage in a construction contract

Retainage (also called retention) is money withheld from progress payments during a construction project. The purpose is to give the party paying for the work a financial incentive and a source of funds to address incomplete or defective work at closeout. It also delays cash that a contractor or subcontractor may need to pay labor, suppliers, and other project costs, so it must be administered under the contract and applicable law.

How retainage is calculated

The contract states what amount is subject to retainage and how the percentage is applied. It may apply to the value of work completed, stored materials approved for payment, or another defined base. If the contract withholds 5% of $80,000 in approved work for a billing period, retainage for that period is $4,000 before any prior balance, release, or other contract adjustment. The percentage in that example is illustrative; there is no universal federal rate.

Progress-payment forms commonly show the contract sum, completed work, stored materials, previous payments, change orders, retainage, and the current amount due. The amount payable is not simply the gross value of work installed: deduct prior payments and retainage, and apply approved changes and contract-specific adjustments.

Retainage from owner to prime contractor

The prime contract governs whether the owner may withhold retainage from the prime contractor, the calculation method, and the conditions for reducing or releasing it. A contractor's application for payment should show the basis for the requested amount and reconcile retainage held to date. Owners and contract administrators should verify the work, stored materials, prior certificates, change orders, and retainage calculation before certifying the payment.

Retainage from prime contractor to subcontractors

A subcontract may permit the prime contractor to withhold retainage from a subcontractor, but the subcontract and the law that applies to the project control. The prime contract's rate does not automatically authorize identical withholding downstream. Check the subcontract's payment clause, any flow-down provisions, required notices, and statutory prompt-payment or retainage limits. The contractor must also track what has been withheld and what conditions trigger payment to the subcontractor.

Reduction and release

Some contracts reduce or release part of retainage when the whole project or a defined portion reaches substantial completion. Remaining retainage may be tied to punch-list work, correction of deficiencies, delivery of closeout documents, lien waivers, consent of surety, or final completion. Other contracts use different milestones or do not provide a partial release. Never assume substantial completion automatically releases all withheld money; read the payment and closeout clauses.

Why the rate and timing vary

Retainage can be governed by the prime contract, subcontracts, public procurement rules, prompt-payment laws, and state-specific construction statutes. Rules may differ for public and private work, project size, contract stage, payment tier, or the parties' status. A national exam question may test the general contract concept, but a real project requires the actual contract and the current law for the state and project type.

Administration checklist

• Read the prime contract and each subcontract for the rate, calculation base, milestones, and release conditions.
• Check whether approved stored materials, change-order work, or particular subcontract work are treated differently.
• Show retainage as a separate line in every payment application and maintain a running balance by payee and work package.
• Confirm that downstream withholding is authorized and consistent with applicable prompt-payment rules.
• Calendar substantial completion, punch-list, final completion, and statutory payment deadlines.
• Collect waivers, closeout documents, and any required surety consent without treating them as a substitute for the contract's payment obligations.

Common exam traps

• Treating retainage as a permanent deduction rather than money withheld pending stated conditions.
• Assuming a standard percentage applies on every private or public project.
• Applying the owner's retainage rate automatically to every subcontractor.
• Assuming all retainage is released at substantial completion even when the contract reserves an amount for final work.
• Confusing retainage with a change-order deduction, liquidated damages, or a payment bond claim.
• Calculating retainage on the wrong base or forgetting prior payments and previously withheld amounts.

Key takeaway

Retainage is a contract-based withholding from progress payments, not a universal fixed percentage. Track the amount separately and follow the contract and applicable law for the calculation, any reduction, and final release.