AIA Calculator for Construction Progress Payments
Easily calculate payment applications based on the AIA G702™ & G703™ billing process.
8. Current Payment Due
9. Balance to Finish
Project Financial Breakdown
What is an AIA Calculator?
An AIA Calculator is a specialized financial tool used in the construction industry to simplify and standardize the process of calculating progress payments for contractors. It is based on the framework provided by the American Institute of Architects (AIA) Contract Documents, specifically the G702™ Application and Certificate for Payment, and its continuation sheet, the G703™. This system allows contractors to bill for work as it is completed, ensuring consistent cash flow throughout a project’s lifecycle rather than waiting for one lump sum payment at the end.
This calculator is designed for general contractors, subcontractors, project managers, and property owners who need to create or verify a payment application. It automates the core calculations, such as determining the contract sum to date, calculating retainage, and identifying the current payment due, which minimizes errors and saves significant time. The use of an AIA calculator promotes transparency and accountability between all parties involved in a construction project.
The AIA Payment Application Formula
The calculation for the current payment due follows a logical sequence outlined in the G702 form. Our AIA calculator automates these steps for you. The core formula is:
Current Payment Due = (Total Completed & Stored to Date – Total Retainage) – Previous Payments Received
The process is broken down into several key variables:
| Variable | Meaning | Unit | Typical Range |
|---|---|---|---|
| Original Contract Sum | The base price of the construction project. | USD ($) | $1,000 – $10,000,000+ |
| Net Change Orders | The sum of all approved changes to the project scope. Can be positive or negative. | USD ($) | -$100,000 – $1,000,000+ |
| Total Completed & Stored | The value of all work performed and materials stored on-site to date. | USD ($) | 0 – Contract Sum to Date |
| Retainage | A percentage of each payment held back until project completion. Learn more about retainage calculation. | Percent (%) | 5% – 10% |
| Previous Payments | The cumulative amount paid on prior payment applications. | USD ($) | 0 – Total Earned |
Practical Examples
Example 1: Mid-Project Commercial Build-Out
A contractor is working on an office renovation with an initial contract of $750,000. They have an approved change order for upgraded wiring worth $50,000. To date, they have completed $400,000 worth of work. Retainage is set at 10%, and they have already been paid $225,000.
- Inputs:
- Original Contract Sum: $750,000
- Net Change Orders: $50,000
- Total Completed: $400,000
- Retainage: 10%
- Previous Payments: $225,000
- Results:
- Contract Sum to Date: $800,000
- Total Retainage: $40,000
- Total Earned Less Retainage: $360,000
- Current Payment Due: $135,000
- Balance to Finish: $440,000
You can model this and other scenarios with a construction payment calculator.
Example 2: Early Stage Residential Construction
A home builder has a $1,200,000 contract. There are no change orders yet. They have just completed the foundation and framing, valued at $250,000. Retainage is 5%, and this is their first payment application.
- Inputs:
- Original Contract Sum: $1,200,000
- Net Change Orders: $0
- Total Completed: $250,000
- Retainage: 5%
- Previous Payments: $0
- Results:
- Contract Sum to Date: $1,200,000
- Total Retainage: $12,500
- Total Earned Less Retainage: $237,500
- Current Payment Due: $237,500
- Balance to Finish: $962,500
How to Use This AIA Calculator
Using this calculator is a straightforward process designed to mirror the G702 application form.
- Enter Contract Details: Start by inputting the ‘Original Contract Sum’ and any ‘Net Change by Change Orders’. The calculator will automatically display the ‘Contract Sum to Date’.
- Input Progress Value: In the ‘Total Completed & Stored to Date’ field, enter the total value of work accomplished for the current billing period plus all previous periods. This figure typically comes from a detailed breakdown on a G702 calculator continuation sheet.
- Set Retainage: Adjust the ‘Retainage Percentage’ if it differs from the default 10%. The tool instantly calculates the dollar value of ‘Total Retainage’.
- Record Past Payments: Enter the total sum of all ‘Previous Certificates for Payment’ you have already received for this project.
- Review Your Results: The calculator automatically computes and highlights the ‘Current Payment Due’. You can also see important intermediate values like ‘Total Earned Less Retainage’ and the ‘Balance to Finish’, providing a full financial snapshot of the project. The visual chart also updates in real-time.
Key Factors That Affect AIA Payments
- Schedule of Values (SOV): The accuracy of the G703 continuation sheet, or SOV, is critical. This document itemizes the contract sum into different work categories. The ‘Total Completed’ value entered into this AIA calculator is derived directly from the progress reported on the SOV.
- Stored Materials: The value of materials purchased for the project but not yet installed can often be billed for. This must be properly documented and stored securely on-site or in an approved off-site location.
- Change Orders: Approved change orders adjust the total contract value and can impact the payment due. Disputed or unapproved changes should not be included until formally executed.
- Architect/Owner Approval: The payment application must be reviewed and certified by the architect or owner’s representative. Delays in approval can significantly impact a contractor’s cash flow.
- Retainage Laws: Different states have different laws governing the maximum percentage of retainage that can be withheld and the timeline for its release. It’s crucial to understand the regulations for your project’s location.
- Project Progress: The most direct factor is the actual amount of work completed. If work falls behind schedule, payments will be smaller than projected. Many teams use construction billing software to track this.
Frequently Asked Questions (FAQ)
1. What is the difference between AIA G702 and G703?
The G702 is the summary page of the payment application—it’s what this calculator models. The G703 is the ‘Continuation Sheet’ or ‘Schedule of Values,’ which provides a detailed line-item breakdown of the contract sum and shows the work completed for each item. The G703 provides the data needed to fill out the G702.
2. Can I use this calculator for projects that don’t use AIA contracts?
Yes. While this calculator is based on the AIA format, the underlying logic of progress billing (billing for completed work minus retainage) is standard in the construction industry. It can be adapted for any project that uses a schedule of values and progress payments.
3. What happens if the owner disputes an amount?
If an owner or architect disputes a portion of the payment application, they may choose to certify a lower amount or withhold payment altogether until the issue is resolved. This calculator helps by providing a clear, formula-based calculation that can serve as a starting point for discussions.
4. How is retainage handled at the end of a project?
Retainage is typically released in two parts: a portion at substantial completion and the final amount after the warranty period expires and all punch list items are complete. This calculator focuses on calculating retainage during the project, not its final release.
5. Why is my ‘Balance to Finish’ different from the remaining contract amount?
The ‘Balance to Finish’ includes the retainage being held. The formula is: ‘Contract Sum to Date’ – ‘Total Earned Less Retainage’. This represents the total amount of money, including retainage, that will be paid out over the remainder of the project.
6. Can I include change orders that are not yet approved?
No, you should only include the value of fully executed change orders in your payment application. Including pending changes can lead to rejection of the application. A good AIA G703 tutorial will emphasize this point.
7. What is “stored materials”?
“Stored materials” refers to materials, equipment, or supplies purchased for the project that are stored on-site (or an approved off-site location) but have not yet been incorporated into the work. Their value can often be included in the ‘Total Completed & Stored to Date’.
8. How often should I submit a payment application?
This is determined by the contract, but it is most commonly done on a monthly basis. Consistent, accurate, and timely submission is key to maintaining healthy project cash flow.