Use this retainage calculator to check how much money is held from a construction billing and how much payment is released now. Retainage is a percentage of the amount billed that stays back until the contract says it can be released. Ten percent is the default because it is a common construction retainage rate, but the right number comes from the contract, change order, or pay application rules on the job. The calculator keeps the math simple: amount billed times retainage percent equals retainage held. Amount billed minus retainage held equals net payment released.
Retainage Calculator: Held Amount and Net Payment
Calculate retainage held and net payment released from an amount billed and retainage percentage. Built for pay app math.
Retainage Calculator
Enter the amount billed and retainage percentage. The calculator returns the amount held and the net payment released.
Retainage held$2,500
Net payment released$22,500
Estimates for planning only. Check the result against your plans and a supplier quote before you order.
How to Use the Calculator
Enter the gross amount billed for the current pay period or line item. Use the amount before retainage is withheld. Then enter the retainage percentage that applies to that billing. If the contract steps retainage down after substantial completion, enter the current rate, not the starting rate. The calculator returns two numbers: the retainage held and the net payment released. Use those numbers to check a pay application, invoice schedule, or owner payment before it reaches accounting.
The Formula
The formula is retainage held = amount billed x retainage percent / 100. Net payment released = amount billed - retainage held. If the amount billed is $25,000 and retainage is 10 percent, the held amount is $2,500 and the released payment is $22,500. If retainage drops to 5 percent on the same billing, the held amount is $1,250 and the released payment is $23,750. The calculator does not change the bill. It shows the cash that moves now and the cash that remains held.
Pay Application Notes
Retainage can be calculated on the current period billing, the stored material line, the completed work line, or a contract total depending on the pay app format. Enter the number the retainage percentage is being applied to. Do not mix current-period retainage with total retainage held to date. Those are different checks. On a running pay app, total retainage held to date equals prior retainage plus current retainage minus any release. This calculator handles the current math cleanly so the larger pay app can reconcile.
Worked Example
A subcontractor bills $42,800 for completed work this month. The contract retains 10 percent until the release milestone. Enter $42,800 and 10 percent. The retainage held is $4,280. The net payment released is $38,520. Later, the job reaches the point where retainage drops to 5 percent for new billings. On a $42,800 billing at 5 percent, the held amount is $2,140 and the released payment is $40,660. The cash difference is real, so I want the percentage visible on every payment check.
Release Notes
Retainage release is separate from retainage withholding. A release may happen at substantial completion, final completion, punch-list closeout, owner acceptance, or another contract milestone. Track releases as their own lines so the pay app can show held to date, released to date, and remaining retainage. This calculator does not decide when money should release. It calculates the holdback and net payment for the amount and percentage entered. For broader bid and cost math, pair this with the job-costing calculator and construction markup calculator.
Cash Flow Notes
Retainage is small on one invoice and heavy across a long job. A 10 percent holdback on a $25,000 billing is $2,500. Across ten billings, the withheld cash can equal a payroll cycle, a supplier draw, or the final push on closeout. That is why I track it outside the sales total. Revenue booked and cash received are not the same thing when retainage is active. The project can look healthy on paper while the bank account waits for release. Keep retained cash visible in the job report, the pay app, and the closeout checklist.
Line Item Notes
Some pay applications apply retainage evenly to every line. Others treat stored materials, change orders, mobilization, or approved allowances differently. Do not force all lines through one percentage if the pay app separates them. Run the calculator on the amount that shares the same retainage rate, then add the lines together. That gives a clean current-period held amount and a clean current-period net payment. It also makes the math easier to defend when an owner, GC, or bookkeeper asks why the check amount does not match the gross billing.
Retainage Reference
| Reference | Planning value | Field note |
|---|---|---|
| Common rate | 10% | Default calculator value |
| Held amount | Billed amount x retainage% | Money withheld from the current billing |
| Net payment | Billed amount - held amount | Cash released from the current billing |
| Release | Separate pay app line | Track released retainage apart from new retainage held |
| Do not mix | Current vs to date | Use the same basis when checking a pay app |
FAQ
What is retainage in construction? Retainage is money withheld from a construction billing until the contract release condition is met. It protects completion, closeout, and punch-list obligations.
How do I calculate 10 percent retainage? Multiply the billed amount by 0.10. A $25,000 billing with 10 percent retainage holds $2,500 and releases $22,500.
Is retainage calculated before or after tax? Use the basis required by the contract and pay application. Some formats apply retainage before tax, and others handle tax as a separate line.
Does this calculate retainage release? No. It calculates the amount held and the net payment released for the entered billing. Track release of prior retainage as a separate pay app item.