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Construction Progress Billing: 5%–10% Retainage for Contractors

Learn how contractors calculate progress bills from the schedule of values, prepare pay applications, prevent rejections, and plan for 5% to 10% retainage.

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Progress billing invoices a construction contract in stages by percent complete, so you collect cash during a long job instead of waiting for final completion. Each bill equals percent complete times contract value, less prior billings and retainage, which commonly runs 5% to 10%. Monthly cycles are typical. It fits multi-month work with measurable scope and staged owner financing.

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When does progress billing beat milestone or lump-sum billing?

Progress billing works best when a job runs for months, the scope breaks into measurable pieces, and the owner or lender releases money in stages. If you can verify percent complete line by line, you can bill on a steady rhythm and keep payroll and suppliers covered.

The three models carry different risks:

Lenders and owners may structure draws around a recurring pay application reviewed by an architect or inspector. If your contract already calls for staged draws, you are billing this way whether you planned to or not.

How do you calculate a progress bill from the schedule of values?

Everything starts with the schedule of values (SOV), which splits the contract into line items. The AIA’s G702 and G703 forms are the standard way to present it: the G703 continuation sheet carries line-item percent complete, while the G702 summarizes contract status to date, retainage and previous payments.

Work through the math in this order:

  1. Set each line’s percent complete from verified field progress.
  2. Multiply each percentage by that line’s scheduled value to get work earned.
  3. Add stored materials you are entitled to bill, with proper documentation.
  4. Sum the lines to get total earned to date.
  5. Subtract retainage on that cumulative total.
  6. Subtract everything billed and paid on prior applications.

Say a $500,000 contract is 40% complete with 10% retainage. Earned to date is $200,000, retainage is $20,000, so $180,000 is payable to date. If $120,000 was already paid, this month’s bill is $60,000.

Because the method is cumulative, corrections fix themselves. If a line was overstated last month and the true figure is lower, the new calculation produces a smaller increment, even a negative one, without a separate adjustment. Approved change orders raise the contract value and must be added to the SOV before you bill against them.

Retainage on approved draws commonly ranges from 5% to 10%, held until final completion. Plan your working capital around that withheld slice.

What documents must go with a pay application?

A pay app is more than an invoice. Every dollar claimed has to be substantiated against the SOV, or the reviewer sends it back.

The application itself should show:

Backup typically includes:

Granularity matters too. Architects verify percent complete far faster when the SOV has separate rows for each sub-scope rather than a few lump lines. Check your SOV breakdown before the first submission, not after the first rejection. Payroll evidence is also where staffing arrangements bite: if you use outside labor, a provider such as temporary staffing for construction must still deliver records that match your certified payroll.

Pro Tip: Set an internal cutoff ahead of the owner’s deadline and circulate a draft requisition for review, so errors surface while there is still time to fix them.

For the field side of this, our guide to billing readiness covers how to prepare records before the pay app is built.

Why does cash run short even with monthly billing?

Payroll and suppliers get paid continuously, while billing runs monthly and approvals can add weeks. Research on construction cash flow finds that actual outflow often lags cost accrual because of supplier and labor payment terms, and that ignoring those lags can overstate liquidity needs by as much as 40%, which pushes contractors into more expensive financing than they need.

Retainage adds a second drag. Public contracts help on timing: federal prompt-payment rules call for progress payments 14 days after a proper request.

Research links steady fund flow to project performance and names payment delays along the owner, contractor and subcontractor chain as a key cause of project delays.

Practical ways to bridge the gap:

What gets pay applications rejected, and how do you check before submitting?

The usual culprits are missing lien waivers, math errors in the SOV, billing for unapproved change orders, absent backup documents, and filing after the general contractor’s cutoff.

Run this checklist before every submission:

  1. Recheck the SOV math on every line and the cumulative totals.
  2. Confirm the retainage percentage matches the contract.
  3. Verify all required signatures and notarizations.
  4. Attach every backup document, including proof for any stored materials billed.
  5. Confirm each change order was approved before you billed it.

Pro Tip: Treat the draft requisition as a required step, not a courtesy. An internal cutoff ahead of the submission deadline gives you time to catch problems before the owner does.

Unapproved change orders are an avoidable error, and our write-up on change order tracking shows how field proof can help with approvals.

How do you choose between progress, milestone and lump-sum billing?

Use progress billing for long, measurable work with staged financing. Use milestone billing when the job produces clear, separate deliverables. Use a lump sum only for short jobs where waiting for payment will not strain your cash.

Which standards and workflows actually speed up approvals?

Public agencies publish their processes, and they are worth copying. New York City’s Department of Design and Construction runs a draft requisition and Complete Payment Package workflow, where the contractor submits a draft for preliminary review and then a full package at least one week before the end of the pay period, as its payment processing SOP describes.

Reviewers compare the payment detail to the payment summary and may return incomplete packages for correction.

Federal work adds its own rules. Fixed-price construction payment terms allow monthly progress payments on approved estimates with itemized substantiation, and retainage of up to 10% where progress is unsatisfactory. The AIA forms standardize the data, which is why a granular SOV makes the architect’s verification quick.

Why billing accuracy is a field and office job

Billing accuracy is not something the accounting desk can fix alone. By the time a number reaches the pay app, it was either captured in the field or it was guessed. Small daily habits, such as photographing completed work, logging deliveries and closing out field tickets promptly, can help reduce payment delays later.

My advice: audit your current pay-app workflow, set a firm internal cutoff, and make sure every SOV line can be traced back to a field record. Close that loop and collections get smoother.

— Client

Connect your field records to pay-app readiness with Hawkeye Field Ops

Late, rejected pay apps usually trace back to missing field evidence. With Hawkeye Field Ops, we help you tie progress photos, field tickets and daily work records to the work they support, so your billing package is assembled from documented activity instead of reconstructed at month end. Our construction page shows how this works on active jobs, and our mobile site surveillance helps you maintain visibility at remote sites.

Learn more about Hawkeye Field Ops on its page, and we will walk you through it.

FAQ

How do you calculate WIP in construction?

Work in progress compares what you have earned with what you have billed. Take percent complete times contract value to get earned revenue, then subtract amounts billed to date. A positive result is underbilling, and a negative one is overbilling.

How to do progress billing?

Break the contract into a schedule of values, measure percent complete on each line each period, and compute earned less retainage and prior billings. Attach backup documents and submit before the cutoff, as described in the pay application guidance.

How is progress billing calculated?

The standard formula is percent complete times contract value, minus previous billings and retainage. Retainage is commonly 5% to 10% and is figured on cumulative earned amounts.

How much should a progress payment be?

It should equal the value of work completed and stored materials to date, less retainage and earlier payments. On federal work, retainage of up to 10% may apply when progress is unsatisfactory.

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