How does the research and development tax credit work?
Available for documented qualified research
IRC §41 provides a credit equal to 20% of qualified research expenses above a base amount, and the base can never be less than 50% of current-year expenses. The alternative simplified credit is 14% of expenses above half of the prior three-year average. After P.L. 119-21, §280C(c) requires you either to reduce your §174A research deduction by the credit or to elect a reduced credit.
Reviewed by Ebot Mbi, CPA, EA · Last reviewed · Law and figures current as of September 17, 2026
Key takeaways
- The regular credit can never exceed 10% of current-year qualified research expenses, because the base is at least 50% of those expenses.
- The alternative simplified credit is 14% of expenses above 50% of the prior three-year average (6% if there were no expenses in any of those years).
- For tax years beginning after 2024, domestic research costs are deductible under §174A, and §280C(c) reduces that deduction by the credit unless you elect a reduced credit.
- The credit is nonrefundable and limited by the general business credit rules, though qualified small businesses can apply part of it against payroll tax.
- Every project must meet the four-part test, and records must tie costs to specific business components.
What it is
The research credit rewards businesses that spend money developing or improving products, processes, software, techniques, formulas, or inventions. Qualified research expenses are mainly wages for employees doing, directly supervising, or directly supporting qualified research; supplies used in that research; and 65% of amounts paid to contractors for qualified research performed in the United States.
A credit reduces tax directly, while a deduction reduces taxable income. But the research credit comes with a base-amount calculation, a required reduction to the research deduction, and limits on how much tax it can offset in a given year, so its real value has to be computed.
What the law says
IRC §41(a)(1) sets the regular credit at 20% of qualified research expenses in excess of a base amount. Under §41(c), the base amount is a fixed-base percentage times average gross receipts for the prior four years, but §41(c)(2) provides that the base amount can never be less than 50% of the current year's qualified research expenses. As a result, the regular credit cannot exceed 10% of current-year expenses.
Under §41(c)(4), a taxpayer may instead elect the alternative simplified credit: 14% of expenses above 50% of the average for the three preceding years, or 6% of current expenses if there were no qualified research expenses in any one of those years.
P.L. 119-21 (the One Big Beautiful Bill Act) added §174A, which restores current deduction of domestic research and experimental expenditures for tax years beginning after December 31, 2024. It also amended §280C(c): the §174A deduction is reduced by the credit, or you can elect under §280C(c)(2) to take a credit reduced by the top corporate rate (21%) instead.
Requirements and tests
To count, costs must relate to qualified research and must be substantiated.
- Each business component must pass the four-part test in §41(d): §174A expenditures, technological in nature, intended to develop a new or improved business component, and substantially all (80% or more) of the activities forming a process of experimentation.
- Excluded: research after commercial production begins, adaptation of an existing product to a customer's needs, duplication of an existing business component, surveys and routine quality testing, and research conducted outside the United States.
- Contract research counts at 65% only if the taxpayer bears the financial risk and retains substantial rights in the results.
- Refund claims must identify each business component, the research activities performed, the individuals involved, and the information sought, as the IRS requires for a valid claim.
- The credit is claimed on Form 6765, which asks for business-component detail.
How it works
Start with the qualified research expenses for each business component. Compute the regular credit, applying the 50% minimum base, and the alternative simplified credit, and choose the method that fits your records and results. Then apply §280C(c): either reduce your §174A deduction by the full credit, or elect a reduced credit on a timely filed original return.
The credit becomes part of the general business credit under §38, which limits how much income tax it can offset each year; unused amounts generally carry back one year and forward 20 years. A qualified small business, generally one with less than $5 million of gross receipts and no gross receipts more than five years before, may elect to apply up to $500,000 of the credit against the employer share of Social Security and Medicare taxes. For partners and S corporation shareholders, the passive activity and alternative minimum tax rules can also limit use of the credit.
Assumptions: Tax year 2026; calendar-year C corporation taxed at 21%; all research is performed in the United States.; Current-year qualified research expenses: $500,000.; Fixed-base percentage 3% × average gross receipts of $3,000,000 = $90,000 computed base, which is below the 50% minimum.; Average qualified research expenses for 2023–2025: $400,000.; The corporation has enough regular tax liability to use the credit in full and does not qualify for the payroll tax election.
| Regular method: base amount (greater of $90,000 or 50% × $500,000) | $250,000 |
|---|---|
| Regular credit: 20% × ($500,000 − $250,000) | $50,000 |
| ASC: 14% × ($500,000 − 50% × $400,000) | $42,000 |
| §280C(c)(1): §174A deduction reduced by the $50,000 credit, extra tax at 21% | $10,500 |
| Net benefit of the regular credit after §280C(c) | $39,500 |
| Alternative: elected reduced credit, $50,000 − (21% × $50,000) | $39,500 |
The regular credit here is $50,000 before the §280C(c) adjustment and about $39,500 after it; a $100,000 base on these facts is not possible because of the 50% minimum.
Illustration only; not a projection of your results.
Risks and IRS scrutiny
The IRS examines research credit claims closely, especially refund claims and studies prepared on a contingency-fee basis. The most common failures are missing contemporaneous documentation, wage allocations not tied to specific projects, activities that are routine engineering rather than experimentation, and base-period computations that cannot be supported. A disallowed credit can bring interest and the 20% accuracy-related penalty. Be cautious of promoters who sell credit studies without a real review of eligibility.
Who it is not for
This credit is not for businesses doing routine production, cosmetic redesigns, customer-specific customization, or research after commercial production. It is also not a fit if you cannot link costs to specific projects and show what technical uncertainty you worked to resolve.
How ebotCPA helps
We review your projects against the four-part test, compute both credit methods with the 50% minimum base, model the §280C(c) election against your §174A deduction, and check how much of the credit your tax position can actually use.
Book a $497 Case Analysis to have Ebot Mbi, CPA, EA review your facts before you act.
Frequently asked questions
How much is the R&D tax credit worth?
The regular credit is 20% of qualified research expenses above a base amount that is at least 50% of current expenses, so it cannot exceed 10% of current expenses before the §280C(c) adjustment. The alternative simplified credit is 14% of expenses above half the prior three-year average.
Can I deduct research expenses and also claim the credit?
Yes, but under §280C(c) as amended by P.L. 119-21, your §174A deduction is reduced by the credit unless you elect a reduced credit.
Can a startup use the R&D credit against payroll taxes?
A qualified small business, generally one with less than $5 million in gross receipts and no gross receipts more than five years before, can elect to apply up to $500,000 of the credit against the employer share of Social Security and Medicare taxes.
What records do I need for the research credit?
Records that tie wages, supplies, and contract costs to specific business components and show the technical uncertainty and experimentation for each.
Have facts like these?
Book a $497 Case Analysis to have Ebot Mbi, CPA, EA review your facts before you act.