How to Bill Retainage on AIA Form: The James Moore Guide

You’ve wrapped up a major construction project milestone, and it’s time to submit your payment application. The numbers are straightforward until you hit that retainage line on the AIA form. Suddenly, you’re second-guessing whether you’re billing it correctly, reducing it properly or accidentally short-changing your company’s cash flow. If you’ve been there, you’re not alone. Understanding how to bill retainage on AIA form documents is one of those technical details that can quietly impact your project profitability.

What Retainage Actually Means on Your AIA Forms

Retainage is the percentage of payment that owners withhold from contractors as financial protection until project completion. Typically ranging from 5% to 10%, this holdback appears on every payment application you submit throughout the project lifecycle.

On AIA Form G702, you’ll see retainage calculated in two places. Column F shows the total completed and stored to date, while Column G displays the retainage amount being held back from that total. The math is straightforward: if you’ve completed $100,000 of work and the contract specifies 10% retainage, you’re billing for $90,000 with $10,000 held in retention.

But here’s where contractors often stumble. That retainage calculation applies to both the current period’s work and any previously completed work that’s still being held. You need to track cumulative retainage, not just the current month’s holdback.

Get the Calculations Right

The American Institute of Architects G702 and G703 forms work together to create your complete payment application. The G702 provides your application summary, while the G703 breaks down the work by cost codes or line items.

Start with your G703 continuation sheet. For each line item, calculate the work completed this period and the total work completed to date. Then apply your retainage percentage to the total completed column. This gives you the cumulative retainage being held on that specific line item.

Here’s an example. Say your electrical work contract is $250,000 with 10% retainage. You’ve completed $150,000 to date. Your G703 shows $150,000 in Column F (work completed to date) and $15,000 in Column G (retainage). Your current payment request for electrical is $135,000, assuming this is your first billing.

A common mistake? Contractors sometimes calculate retainage only on the current period’s work instead of the cumulative total. This throws off your entire payment application and creates reconciliation headaches down the road.

When Retainage Reduces or Gets Released

Many contracts include provisions for retainage reduction as you progress through the project. Retainage often reduces from 10% to 5% once you reach 50% completion, or gets eliminated entirely at substantial completion.

When this happens, you’ll show the adjustment on your AIA form by reducing the retainage percentage in Column G. If your contract allows retainage to drop to 5% at the halfway point, your next payment application after crossing that threshold shows the reduced holdback going forward.

Substantial completion triggers the biggest retainage release. At this milestone, most contracts release the bulk of retained funds, holding back only enough to cover punchlist items and final completion requirements. You’ll show this on your G702 by dramatically reducing the retainage column, sometimes to just a few thousand dollars or a small percentage.

Smart contractors track these milestone dates carefully. Missing a retainage reduction opportunity means unnecessarily constraining your cash flow when you need it most.

The Stored Materials Angle

If your contract allows billing for materials stored on or off-site, retainage typically applies to these amounts too. Line 7 of the G702 specifically addresses stored materials, and yes, the owner usually holds back the same percentage on these values.

This creates an interesting cash flow challenge. You’re paying suppliers in full for stored materials but only receiving 90% (or whatever your contract specifies) from the owner. That gap comes straight out of your working capital until final payment.

Document your stored materials meticulously. Owners and their representatives scrutinize these line items closely during payment application reviews. You need detailed inventory lists, delivery tickets and photos showing proper storage conditions. Without solid documentation, expect pushback on these billing requests.

Getting retainage billing right on your AIA forms protects your project cash flow and prevents payment disputes that drag out collections. The forms themselves are straightforward once you understand the cumulative calculation method and know when reduction milestones kick in. If you’re managing multiple complex projects with varying retainage terms and want to ensure your billing processes stand up to owner scrutiny, our team specializes in construction accounting reviews. Contact us today to identify gaps before they become problems.

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