Section A of Form 6765 is where the regular R&D credit method is computed. This page walks through the regular-method calculation conceptually in the order the current form (12/2025 revision) requests inputs. It is educational and is not individualized tax advice, and it does not reproduce the form verbatim. For the regular method formula, see our page on the regular credit method.
The Conceptual Flow on Section A
Section A of the current Form 6765 requests inputs in a sequence that follows the regular credit formula:
Regular credit = 20% × (current-year QREs − base amount)
Where:
Base amount = fixed-base percentage × average annual gross receipts for the 4 preceding years (subject to a 50% minimum)
The conceptual flow on the form is:
- Current-year QREs. The total qualified research expenses for the credit year.
- Fixed-base percentage. The percentage based on 1984–1988 data, or 3% for start-up companies.
- Average annual gross receipts. The average of gross receipts for the four preceding years.
- Base amount. The product of the fixed-base percentage and the average gross receipts.
- Minimum base amount check. The base amount cannot be less than 50% of current QREs.
- Excess. Current QREs minus the base amount (using the larger of the computed or minimum base).
- Tentative regular credit. 20% of the excess.
Major Input Categories
Current-Year QREs
The form requests the total QREs for the credit year. This is the sum of qualified wages, 65% of qualifying contract research, and qualified supplies. For more on how QREs are assembled, see our page on how QREs feed the calculation.
Fixed-Base Percentage
The form requests the fixed-base percentage. For companies with 1984–1988 history, this is the ratio of aggregate QREs to aggregate gross receipts for that period, capped at 16%. For start-up companies (fewer than 3 years of gross receipts in 1984–1988), the fixed-base percentage is 3% for the first 5 applicable post-1993 years (with transitional calculations thereafter). For more, see our page on the fixed-base percentage.
Average Annual Gross Receipts
The form requests the average annual gross receipts for the four preceding taxable years. This is the average of gross receipts for the four years preceding the credit year. For more, see our page on gross receipts.
Base Amount
The form computes the base amount as the product of the fixed-base percentage and the average annual gross receipts. The form also applies the 50% minimum base amount rule — the base amount cannot be less than 50% of current QREs. For more, see our page on the base amount.
A Conceptual Walkthrough With Illustrative Numbers
The following is a hypothetical illustration for educational purposes only. It does not represent any actual taxpayer and does not state a filing recommendation.
Suppose a start-up company enters the following on Section A:
| Form input | Amount | |---|---| | Current-year QREs | $500,000 | | Fixed-base percentage (start-up) | 3% | | Average annual gross receipts (4 preceding years) | $2,000,000 |
Step 1: Compute the base amount.
Base amount = 3% × $2,000,000 = $60,000
Step 2: Apply the minimum base amount.
Minimum base = 50% × $500,000 = $250,000
Since $60,000 < $250,000, the form uses $250,000 as the base amount.
Step 3: Compute the excess.
Excess = $500,000 − $250,000 = $250,000
Step 4: Apply the 20% rate.
Tentative regular credit = 20% × $250,000 = $50,000
The tentative regular credit of $50,000 flows to Section C (Current Year Credit) and then to Form 3800.
Downstream Reporting
The tentative regular credit computed in Section A flows to Section C, which determines the current-year credit after any elections (such as the Section 280C election). The current-year credit then flows to Form 3800, General Business Credit, where the Section 38 limitation is applied. For more, see our pages on Form 6765 sections explained and carryforward and carryback.
Important Note on Form Changes
The specific line numbers and labels on Section A can change from year to year as the IRS updates the form. The description above is a conceptual walkthrough based on the 12/2025 revision, reviewed August 2026. Taxpayers should always use the current form and instructions for the tax year at issue. The current Instructions for Form 6765 on IRS.gov are the authoritative reference for the specific lines.
Documentation Needed
Each input on Section A must be supportable: current QREs (payroll, contractor, and supply records), the fixed-base percentage (1984–1988 data or start-up status), and gross receipts for the four preceding years. For more, see our page on R&D tax credit documentation.
Questions for Your Tax Professional
- How do I determine my fixed-base percentage for Section A?
- What gross-receipts figure should I use for the four preceding years?
- How does the 50% minimum base amount affect my computation?
- How does my Section A result compare to the ASC in Section B?
- What records support each input on Section A?
Key Takeaway
Section A of Form 6765 computes the regular R&D credit by requesting current QREs, the fixed-base percentage, average gross receipts for the four preceding years, and the resulting base amount (subject to the 50% minimum). The 20% rate is applied to the excess of current QREs over the base amount. The tentative credit flows to Section C and then to Form 3800. The specific lines can change, so the current form and instructions are authoritative. For the formula, see our page on the regular credit method.