Finance category

Mortgage, loan, investing, tax, and money calculators.

Subcontractor Retainage Calculator

Retainage holds back 5-10% of each subcontractor progress payment to ensure complete performance and punch-list correction before final payment release. State laws regulate retention rates and timing of release. This calculator computes total retainage, currently held amount, and net paid to date.

Sub contract amount

Retainage %

5-10% typical

Billed to date

Completion threshold for retainage release %

Some contracts release at 50%

Total retainage at completion

$35,000

Currently held back

$20,000

Net paid to sub to date

$180,000

Final release at substantial completion

$35,000

How the math works

Retainage holds back 5-10% of each progress payment to ensure the sub completes work and corrects punch list before final payment. Released at substantial completion (some contracts step down to 5% at 50% completion).

Many states regulate retainage — California caps retention at 5%, requires interest on long-held retention. Federal contracts via Miller Act require retention release procedures.

Editorial noteMaintained by EveryCalc - Reviewed June 2026

EveryCalc calculators are designed for fast, practical estimates with transparent inputs and no required account. We use plain formulas, visible assumptions, and related tools so visitors can check the result from more than one angle.

Results are informational only. For financial, tax, legal, medical, construction, or other high-impact decisions, verify the output against primary sources or a qualified professional.

Learn more about our review process on the EveryCalc methodology page.

How this calculator works

What this page estimates

This Subcontractor Retainage Calculator is built to give a quick, browser-based estimate for subcontractor retainage. Retainage holds back 5-10% of each subcontractor progress payment to ensure complete performance and punch-list correction before final payment release. State laws regulate retention rates and timing of release. This calculator computes total retainage, currently held amount, and net paid to date. The inputs stay on the page during normal use, and the result should be treated as an estimate for planning, comparison, or education rather than professional advice.

Calculation approach

The calculator applies the standard relationship implied by the inputs, then formats the answer so it can be checked and reused. For finance tools, the most important step is using consistent units, rates, time periods, and assumptions before comparing the result with another calculator or outside quote.

Example workflow

For example, start with a realistic value you already know, change one input at a time, and watch how the answer moves. That makes it easier to tell whether the result is being driven by the main amount, the rate, the time period, or a unit conversion.

Practical checks

Use current, real-world numbers when the result affects money, health, tax, or legal decisions.
Run a low, base, and high case when the inputs are estimates.
Check the related calculators below when the next decision depends on a different assumption.

How to interpret the subcontractor retainage result

Best use

Use the result as a planning number for comparing payments, rates, returns, tax reserves, or cash-flow choices before you request a quote or make a commitment.

Cross-check

Compare the answer with the contract, lender estimate, tax form, brokerage statement, payroll record, or invoice that will control the real-world outcome.

Watch for

Do not rely on a single optimistic rate, return, or fee assumption. Money pages work best when you run low, base, and high cases and keep professional advice separate from the estimate.

This page belongs to the Finance calculator library, so the answer should be read in the context of the decision you are modeling rather than as a universal rule.

Before relying on this subcontractor retainage estimate

Most calculator mistakes come from the inputs, not the arithmetic. Use this short audit before you reuse the answer in a spreadsheet, quote, application, or important conversation.

Confirm source numbers

Match balances, rates, fees, taxes, income, and payment dates against the lender quote, payroll record, tax form, statement, invoice, or contract.

Separate cash flow from total cost

A lower monthly payment can still cost more over time if fees, interest, taxes, or a longer term are hidden in the structure.

Run conservative cases

Test at least one higher-cost or lower-return case before using the output for a purchase, refinance, investment, loan, or tax decision.

Rerun this page when the rate, price, term, fee, tax rule, income, expense, or expected holding period changes.

How to Use

Enter sub contract amount and retainage %.
Enter billed-to-date amount.
Enter completion threshold for partial retainage release if applicable.
Read total retainage, currently held, and net paid to date.

Frequently Asked Questions

Standard retainage %?

Most contracts: 10% on first 50% of work, then 5% (step-down). California caps retention at 5%. Federal Miller Act 10% standard. Public works often 10%.

When does retainage release?

Substantial completion (typically 95% complete) triggers initial release; final 25-50% holds back until punch list complete and lien waivers received.

Sub financing of retention?

Subs often borrow against retention at 8-15% — adds 1-3% to their effective bid. Faster retention release (or step-down to 5% at 50%) reduces sub financing need and overall bid pricing.