Retainage is the money you have earned but cannot collect until the project is done. On a $5 million job, that is $250,000 to $500,000 of your money sitting in someone else's account, and how you manage it decides whether you make a profit or finance the owner's project.
Retainage, also called retention, is the percentage of each progress payment withheld by the owner or general contractor until the project reaches substantial completion. The standard rate is commonly 10% of each billing period's completed work, though many contracts step it down to 5% at the halfway point. The theory is that retainage ensures contractors finish the job and fix deficiencies. The reality is that retainage often equals or exceeds the contractor's entire profit margin, and it functions as an interest free loan from the contractor to the owner.
How Retainage Appears on AIA Forms
On the AIA G702, the standard application for payment, retainage is Line 5. It has two components: retainage on completed work, Line 5a, and retainage on stored materials, Line 5b. These can carry different rates. Some contracts retain 10% on completed work but only 5% on stored materials, on the logic that stored materials are already in the owner's possession. The total retainage, 5a plus 5b, is subtracted from your total completed and stored, Line 4, to determine your earned less retainage amount on Line 6.
The G703 continuation sheet breaks this down by specification section or by schedule of values line, so the owner can see exactly where the retainage is being held. Every pay app you submit carries the running retainage balance, and every pay app the owner approves reduces or increases it. Get the math right on the G702 and G703, because disputes over retainage are one of the most common reasons pay apps get held up.
The Cash Flow Impact
On a $5 million, 12 month project with 10% retainage, you will have $500,000 withheld by the end of the project. If your net profit margin is 6%, or $300,000, the retainage exceeds your entire profit. You are essentially lending the owner money for the duration of the project. Factor retainage into your cash flow projections from day one, and price the cost of carrying that float into your overhead.
The cash flow pinch shows up around the midpoint, when your payroll and material costs are highest but the retainage balance has grown large enough to starve your working capital. This is where contractors who did not plan for retainage start borrowing against their line of credit, and the interest on that borrowing comes straight out of profit. A line of credit is the standard tool, but it is not free, so price it.
Retainage Release and Substantial Completion
Retainage does not release automatically. The contract spells out the trigger, usually substantial completion as documented on the AIA G704 certificate of substantial completion. At that point, the owner releases the retainage on completed work, sometimes holding back a small punch list retainage until the punch list closes. Final retainage, including any retainage on stored materials, releases at final completion and acceptance.
Negotiate the release schedule in the contract before you sign, not at the end when you have no leverage. Common structures include a step down from 10% to 5% at 50% completion, full release at substantial completion, or a 30 day release after substantial completion. Push hard for the most favorable structure you can get, because every month that retainage sits unreleased is a month you are financing someone else's project.
Retainage in Subcontracts
As a GC, you typically flow the same retainage rate down to your subcontractors that the owner imposed on you. This is fair in principle, but it creates a cascade. The sub carries the same float you carry, and if the sub is thinly capitalized, the float pressure shows up as slow performance, skipped work, or a lien filed against your project. Pay attention to your subs' financial health before you push aggressive retainage down to them.
Some states regulate subcontractor retainage by statute, capping the rate or requiring faster release than the prime contract allows. A few states also limit pay if paid clauses that tie subcontractor payment to owner payment. Know the rules in the state where your project sits before you draft the subcontract.
Managing Retainage So It Does Not Manage You
Track the running retainage balance on every pay app and reconcile it against the contract terms monthly. The most common retainage dispute is a balance that has drifted up or down because someone applied the wrong rate on a mid project pay app, and nobody caught it until closeout. A monthly reconciliation takes five minutes and prevents a closeout fight.
Submit a clean pay app on time, every time, with accurate retainage math, because a flawed pay app gives the owner an excuse to hold the entire payment, not just the disputed line. Push for retainage release the moment you hit the contract trigger, in writing, with the supporting paperwork. Retainage is your money, and the longer it sits in the owner's account, the more of your profit it eats.