Research Credit for Small Businesses: Form 6765 Guide
The four-part test, which costs qualify, the payroll tax offset for startups, and how restored research expensing changed the math.
Reviewed by the Fairlight Accounting cross-border tax team — U.S. & Canadian Tax Desks
The research credit under Section 41 rewards businesses for developing or improving products, processes, software, or formulas. It is a dollar-for-dollar credit based on qualified wages, supplies, and contract research. Small businesses can claim it on Form 6765, and young companies with little income tax can apply up to $500,000 a year against payroll tax instead.
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What activities qualify?
Each project must pass a four-part test:
- Permitted purpose — creating or improving the function, performance, reliability, or quality of a product, process, software, technique, or formula.
- Technological in nature — relying on engineering, physical or biological science, or computer science.
- Elimination of uncertainty — at the start, you were uncertain about capability, method, or design.
- Process of experimentation — you evaluated alternatives through modeling, testing, or trial and error.
Software development, product design, manufacturing process improvements, and engineering for custom builds often qualify. Market research, routine quality testing, cosmetic changes, and research after commercial production generally do not.
Which costs count?
| Cost | Included |
|---|---|
| Wages of employees doing, supervising, or directly supporting research | Taxable W-2 wages for that time |
| Supplies used and consumed in research | Yes (not general equipment or depreciable property) |
| Contract research | 65 percent of amounts paid to contractors for research performed in the United States (75 percent for qualified research consortia) |
| Cloud computing used for development or testing | Yes, when used in qualified research |
| Research performed outside the U.S. | No |
| Research funded by a customer or grant (you are paid regardless of outcome or keep no substantial rights) | No |
How is the credit calculated?
Most small businesses use the alternative simplified credit: 14 percent of qualified research expenses above half of the average for the prior three years (or 6 percent of the current year's expenses if any one of those three years had none). The regular credit, at 20 percent above a historical base, can be larger for companies with long records. Businesses either reduce their research deduction by the credit or elect a reduced credit instead.
What is the payroll tax offset?
A qualified small business — gross receipts under $5 million for the year and no gross receipts for any year before the five-year period ending with that year — can elect to apply up to $500,000 of the credit against payroll tax: up to $250,000 against the employer share of Social Security tax and the rest against the employer share of Medicare tax. The election can be made for no more than five years. The election is made on Form 6765 with a timely filed original return (including extensions), not an amended return, and the credit is then claimed on Form 8974 with the payroll returns, starting with the first quarter after the income tax return is filed. This lets pre-profit startups turn research into cash.
How did the 2025 tax law change research costs?
For tax years beginning in 2022 through 2024, domestic research costs had to be capitalized and amortized over five years. The 2025 tax law created Section 174A, which restored immediate deduction of domestic research costs for tax years beginning after 2024. Unamortized domestic costs from 2022 through 2024 can be deducted in 2025 or spread over 2025 and 2026. Small businesses meeting the Section 448(c) gross receipts test for 2025 ($31 million average) could instead apply Section 174A back to 2022, but the amended returns were due by July 6, 2026 (earlier for some 2022 returns) — that window has closed. Foreign research costs remain amortized over 15 years.
Frequently asked questions
Do I need a patent to claim the credit?
No. Failed experiments qualify as long as the four-part test is met.
What documentation does the IRS expect?
Project descriptions, the uncertainty you faced, the alternatives you tested, and time records linking wages to each project. Form 6765's Section G asks for business-component detail — optional for tax years beginning before 2026 and generally required after that — so contemporaneous records matter.
Can a pass-through business claim it?
Yes. An S corporation or partnership calculates the credit and passes it to owners, subject to limits on the owners' returns.
Can I claim it for prior years?
Generally yes, by amended return within the refund period, if the claim includes the information the IRS requires. The payroll tax election, however, cannot be made on an amended return.
Official sources
The IRS explains: “Use Form 6765 to: Figure and claim the credit for increasing research activities. Elect the reduced credit under section 280C. Elect and figure the payroll tax credit.” — Internal Revenue Service, About Form 6765, Credit for Increasing Research Activities, https://www.irs.gov/forms-pubs/about-form-6765
The IRS explains: “IRA Provision 13902 increased the maximum amount of payroll tax research credit that a QSB can elect to apply against payroll tax liability from $250,000 to $500,000 for tax years beginning after December 31, 2022.” — Internal Revenue Service, Qualified small business payroll tax credit for increasing research activities, https://www.irs.gov/businesses/small-businesses-self-employed/qualified-small-business-payroll-tax-credit-for-increasing-research-activities
Next step
Fairlight Accounting handles U.S. domestic, cross-border (U.S.–Canada), and international tax returns, plus bookkeeping, payroll, and CFO advisory. Our U.S. Tax Desk screens projects against the four-part test before the credit is claimed. See pricing or book a free fit call.
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