How Payment Application Math Works
A progress payment application (standardized in US construction commercial practice) aggregates contract value adjustments, billing history, and current month progress into a single certified statement. The standard calculation engine processes these nine lines:
| Line Number & Item | Formula / Mathematical Calculation | Description |
|---|---|---|
| 1. Original Contract Sum | Input amount ($) | The original contract amount agreed upon execution. |
| 2. Net Change by Change Orders | Input or Log sum ($) | Total cumulative value of all approved change orders. Can be positive or negative. |
| 3. Contract Sum to Date | Line 1 + Line 2 | The current revised total value of the contract. |
| 4. Total Completed & Stored to Date | Total Completed Work + Stored Materials | Sum of physical work completed to date plus uninstalled materials stored on site. |
| 5. Retainage Held | Completed Work Retainage + Stored Materials Retainage - Retainage Released | The portion of earned progress withheld as security (typically 5%–10%). Separate rates can apply. |
| 6. Total Earned Less Retainage | Line 4 - Line 5 | Contractor's net cumulative earned amount approved to date. |
| 7. Less Previous Certificates for Payment | Input amount ($) | Net earned amount certified in all prior periods (Line 6 from previous application). |
| 8. Current Payment Due | Line 6 - Line 7 | The net payment amount requested for the current billing cycle. |
| 9. Balance to Finish, Including Retainage | Line 3 - Line 6 | The remaining unpaid contract balance, including withheld retainage. |
When Contractors Submit a Payment Application
General contractors and subcontractors submit payment applications monthly to request draws. The cycle follows a strict sequence:
- Subcontractor Submittals: Specialized trade contractors (concrete, electrical, mechanical) submit their billing to the General Contractor by a designated date (often the 20th or 25th of the billing month).
- General Contractor Consolidation: The GC consolidates subcontractor draws and their own self-performed work into a single master application, allocating values across a G703 schedule of values register.
- Architect/Owner Rep Review: The architect, owner rep, or construction lender conducts a site walkthrough, cross-checking physical progress and stored material invoices against the claimed billing percentages.
- Certification & Release: Once verified, the architect certifies the payment application cover, and the owner releases the Current Payment Due amount (less retainage) to the contractor.
Pay App vs. SOV vs. Change Order vs. Invoice
| Document Name | Primary Purpose | Relationship to Progress Billing |
|---|---|---|
| Payment Application (G702-style) | Summarizes contract values, billing totals, retainage, and requests certification. | The cover sheet and formal request for draw. Contains the legal signature/notarization blocks. |
| Schedule of Values (SOV) (G703-style) | Breaks down the total contract sum across specific trade lines and tasks. | The detailed backup log attached to the pay app cover, verifying how line 4 was calculated. |
| Change Order | Amends the contract scope, price, or timeline. | Modifies the contract sum, adjusting Line 2 (Net Change by Change Orders). |
| Commercial Invoice | Standard business bill requesting payment. | Typically not accepted on commercial projects without a corresponding, certified payment application cover. |
Retainage & Previous Certificates Basics
Retainage acts as a security deposit held by the owner until substantial completion. If a contractor defaults or fails to correct defects (punch list items), the owner can use the accumulated retainage to complete the work. Typically, a standard 10% rate is used. However, as the project nears completion, the owner may reduce the rate or authorize a partial release of retainage, which is recorded as "Retainage Released" to reduce the held balance.
"Previous Certificates for Payment" is the cumulative net earned value certified from the beginning of the project up to the immediately preceding application. Subtracting this from "Total Earned Less Retainage" ensures that the contractor is only paid for the work completed during the current period, preventing double billing or overpayment.
Disclaimer: Progress billing, retainage limits, interest on late payments, and prompt payment deadlines vary by US state and municipal jurisdiction. This progress billing tool provides mathematical calculations and is not a substitute for professional legal, financial, or accounting advice.
Worked Example: Progress Application #3
Below is a typical progress billing scenario for an interior construction project:
- Original Contract Sum: $280,000.00
- Net Approved Change Orders: $18,500.00 (revised Contract Sum to Date = $298,500.00)
- Work Completed to Date: $145,000.00
- Materials Stored on Site: $12,000.00 (Total Completed & Stored = $157,000.00)
- Retainage Rate: 10% applied to work and stored materials ($14,500.00 completed + $1,200.00 stored = $15,700.00 retainage held)
- Total Earned Less Retainage: $157,000.00 - $15,700.00 = $141,300.00
- Previous Certificates for Payment: $85,000.00
- Current Payment Due: $141,300.00 - $85,000.00 = $56,300.00
- Balance to Finish, Including Retainage: $298,500.00 - $141,300.00 = $157,200.00
Frequently Asked Questions
- What is a construction payment application?
- A construction payment application (often called a pay app or G702-style application) is a formal progress invoice submitted by a contractor or subcontractor to request payment for work completed and materials stored during a specific billing period. It serves as the summary cover sheet for the detailed schedule of values (SOV) continuation sheet.
- How is the "Current Payment Due" calculated on a pay app?
- The current payment due is calculated through a structured 9-step progression: Total Completed & Stored to Date is calculated, then Retainage is deducted to find the Total Earned Less Retainage. Finally, Total Previous Certificates (payments already certified in prior periods) is subtracted from this earned balance to determine the current net payment due.
- What is G702, and can I use this tool instead of the official AIA form?
- AIA G702 is a copyrighted progress billing form published by the American Institute of Architects. Our builder provides an independent progress billing desk that calculates contract math in the same G702-style line sequence (Lines 1-9) and outputs summary reports. It is not an official AIA document and is not affiliated with the AIA. Many owners and architects accept independent G702-style progress worksheets, but you should verify your project's specific contract requirements.
- How does the Change Order Log link to the contract sum?
- When the "Link Change Order Log" feature is enabled, the builder automatically sums the values of all approved change orders in the log and syncs them to the "Net Change Orders" input. Pending and Rejected change orders are excluded from the contract sum math, providing a clean audit trail matching standard construction finance protocols.
- What is retainage, and how is it managed on this payment application?
- Retainage is a contractually agreed percentage (usually 5% to 10%) withheld from each progress payment to ensure satisfactory project completion. This builder allows you to specify separate retainage rates for completed work and stored materials, and enter any released retainage amounts, which automatically adjusts the final net payment due.
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Disclaimer & Trademarks
This Payment Application Builder is an independent administrative worksheet provided for general informational and planning purposes. It is not an official AIA (American Institute of Architects) document. AIA® and G702®/G703® are registered trademarks of The American Institute of Architects. Useful Business Tools is not affiliated with, endorsed by, or sponsored by the AIA. Always verify the progress billing format and submission requirements with your project owner, architect, or legal counsel before signing.