FREE CALCULATOR
Retainage Calculator for Commercial Contractors
Retainage is the percentage of approved billing withheld by owners or GCs until project milestones or completion. Calculate what is being held this period and how it impacts cash received.
For structured progress billing calculations across a project, use the progress billing calculator.
Contract Context
Billing Status
Current Period
Results
Enter your current period earned amount above.
Commercial Contractor Example
Mid-project billing with 10% retainage on a commercial electrical contract. Here's what happens to cash this period:
Billing summary and cash position after this period:
Gross Billing
$28,000
Net Cash Due
$25,200
Retained to Date
$17,300
You earned $28,000 but only received $25,200. That's $2,800 held back this period, adding to $17,300 total retained.
Frequently Asked Questions
What is retainage in construction?
Retainage is a percentage of each progress billing that the owner or general contractor withholds until project completion or specific milestones. It is intended to ensure work is completed and any punch list items are resolved. For subcontractors, retainage creates a cash gap—you complete the work and bill it, but do not receive full payment until later.
How is retainage calculated?
Retainage is calculated as a percentage of the current period earned amount. For example, if you earned $50,000 this billing period and retainage is 10%, then $5,000 is withheld as retainage. This amount is added to previously retained balances and released according to the contract schedule, typically at substantial completion or final acceptance.
When is retainage released?
Retainage is typically released at substantial completion, final acceptance, or according to a schedule defined in the contract. Some contracts release half at substantial completion and the remainder at final closeout. Others may release retainage incrementally as specific milestones are met. The timing and conditions should be clearly spelled out in your subcontract.
What is a typical retainage percentage?
10% is the most common retainage percentage on commercial construction projects. Some public works projects may use 5%. Higher retainage—such as 15% or more—can occur but puts significant cash pressure on subcontractors. Many states cap retainage on public projects. Always verify the retainage rate and release schedule before committing to a contract.
Why This Matters
Retainage creates downstream cash pressure.
You complete the work, submit the billing, but a percentage stays locked until project milestones or completion. Over months, that trapped cash adds up and compounds margin pressure on your operation.
Quoteloc helps upstream—before cash pressure hits. By preventing pricing mistakes, protecting margins before quotes are sent, governing revisions, and keeping approved contract value clearer as jobs change, you reduce the margin errors that make retainage even more painful.
From Cash Timing to Job Profit Reality
Retainage affects cash timing, not whether the job was actually profitable. A job can have cash pressure and cost overrun at the same time.
Use the Job Cost Overrun Calculator to see whether actual costs erased expected profit across your full job lifecycle.
When project delays push completion dates later, retainage stays trapped longer. Use the delay cost impact calculator to see how much schedule delays cost before accounting for slower retainage release.
ONE BILLING PERIOD VS STRONGER QUOTE CONTROL
This calculator shows one period's cash impact.
Retainage is a downstream problem. Quoteloc helps you upstream—before margins erode, before pricing mistakes compound, before change orders blur approved contract value. Stronger quote control means fewer surprises when cash gets tight.
THE PROBLEM
Cash withheld, no visibility
Manual tracking per billing cycle
Margin pressure compounds
WITH QUOTELOC
Tighter quote control
Clearer approved value
Fewer pricing mistakes upstream
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