The R&D tax credit for startups: the four-part test, Form 6765 and the $500,000 payroll tax election

The federal research credit under Section 41 of the Internal Revenue Code rewards US research spending: wages for people doing qualified research, research supplies, certain computer rental, and 65% of amounts paid to contractors for qualified research. Research qualifies only if it passes the four-part test. You figure the credit on Form 6765, using either the regular credit (20% of qualified research expenses above a base amount) or the alternative simplified credit (generally 14% of expenses above half the prior three-year average, or 6% if you had no qualified expenses in any of those three years). A startup that has no income tax to offset can still benefit: a qualified small business, meaning gross receipts under $5 million for the year and no gross receipts in any year before the five-year period ending with that year, can elect to apply up to $500,000 of the credit each year against its employer payroll taxes. You make the election on Form 6765 with a timely filed original return and claim the credit on Form 8974, attached to Form 941, starting in the first quarter that begins after you file the return.

This guide follows the statute and the IRS forms and instructions in effect on October 28, 2026. It is general information, not tax advice. The credit is heavily audited and its rules are detailed, so work through your claim with a CPA.

What is the four-part test?

Section 41(d)(1) defines qualified research as research that meets all four of these requirements:

1. Section 174A expenditures. The expenditures must be treated as domestic research or experimental expenditures under Section 174A. Public Law 119-21 made this cross-reference; before 2025 it pointed to Section 174.
2. Technological in nature. The research must be undertaken to discover information that is technological in nature.
3. Business component. The information must be intended to be useful in developing a new or improved business component of the taxpayer: a product, process, computer software, technique, formula or invention that you hold for sale, lease or license, or use in your business.
4. Process of experimentation. Substantially all of the activities must be elements of a process of experimentation relating to a new or improved function, performance, reliability or quality. Research related to style, taste, cosmetic or seasonal design factors does not count.

The test is applied separately to each business component, which is why the claim is organized by project. Section 41(d)(4) excludes research after commercial production begins, adapting an existing product to a particular customer's requirements, duplicating an existing product, surveys and market research, routine data collection and quality control testing, research conducted outside the United States, Puerto Rico or a US possession, research in the social sciences, arts or humanities, and research funded by another person or a government entity.

Software built for internal use faces a higher bar. Software developed mainly for your own general and administrative functions, such as finance, HR or support, qualifies only if it also passes the high threshold of innovation test in Treas. Reg. § 1.41-4(c)(6): it must be innovative, involve significant economic risk, and not be commercially available. Software you sell, license or use to let customers interact with you is not internal use software. Product engineering at a typical SaaS startup usually falls in that second group, but confirm the classification with your preparer.

Which expenses count?

Under Section 41(b), qualified research expenses (QREs) are:

• Wages for qualified services, meaning engaging in qualified research or directly supervising or directly supporting it. Wages here are wages as defined in Section 3401(a), the income tax withholding definition, so a founder who takes no salary contributes no wage QREs. If substantially all of a person's services for the year are qualified services, all of that person's wages count.
• Supplies used in the research, excluding land and depreciable property.
• Amounts paid for the right to use computers in qualified research, such as rented compute, under the rules in the regulations.
• Contract research, at 65% of the amount paid to non-employees for qualified research performed on your behalf (75% for payments to a qualified research consortium). Research funded by someone else, such as a customer or a grant, is excluded, so check who is paying for the work.

How is the credit calculated?

You choose one method on Form 6765:

• Regular credit (Section A): 20% of QREs above a base amount derived from your historical ratio of research spending to gross receipts. The base can never be less than 50% of the current year's QREs.
• Alternative simplified credit, or ASC (Section B): 14% of QREs above 50% of your average QREs for the three preceding tax years. If you had no QREs in any one of those three years, the ASC is 6% of current-year QREs. Once elected, the ASC applies to later years unless revoked with IRS consent.

Two examples using the ASC:

• A company in its first year of research with $600,000 of QREs gets 6% × $600,000 = $36,000.
• A company with QREs of $200,000, $400,000 and $600,000 in the three prior years, and $900,000 this year, has a prior average of $400,000. Half of that is $200,000, so the credit is 14% × ($900,000 − $200,000) = $98,000.

How does the credit interact with Section 174 and 174A?

There are two links. First, as noted above, qualified research now has to involve expenditures treated as domestic research or experimental expenditures under Section 174A. Second, Section 280C(c)(1), as amended by Public Law 119-21, reduces the domestic R&E you deduct or capitalize under Section 174A by the amount of the credit. Section 280C(c)(2) lets you instead elect a reduced credit, equal to the credit minus the credit multiplied by the top corporate rate under Section 11(b). On Form 6765 you make that election at Item A, and the form multiplies the ASC by 79% (or the regular credit by 15.8% instead of 20%). In the first example above, the reduced credit would be $36,000 × 79% = $28,440. The election must be made on a timely filed return, including extensions, and it is irrevocable. The amount you elect to use against payroll taxes is still treated as a research credit for this purpose.

For the deduction side, including the end of mandatory five-year amortization for domestic R&E, see our guide to Section 174 and 174A.

Who can use the credit against payroll taxes?

Section 41(h) lets a qualified small business elect to treat part of its research credit as a payroll tax credit. A corporation or partnership qualifies for a tax year if:

• its gross receipts for the year are less than $5,000,000, and
• it had no gross receipts for any tax year before the five-tax-year period ending with that year.

Tax-exempt organizations are excluded, and members of a controlled group are treated as one taxpayer, so the gross receipts test and the dollar cap apply to the group.

The cap is $500,000 a year. The original limit was $250,000. The Inflation Reduction Act (Public Law 117-169, section 13902) added a second $250,000 for tax years beginning after December 31, 2022. The elected amount is limited to the smallest of the amount you specify, the year's research credit, and, for a C corporation, the general business credit carryforward from the year, which in practice means the part of the credit you could not use against income tax. You can make the election for no more than five tax years, and it can be revoked only with IRS consent.

The election must be on the original return. You make it in Section D of Form 6765 (check the box on line 33a and enter the amount on line 34, up to $500,000) on an original return filed by its due date, including extensions. The Form 8974 instructions say you cannot claim the payroll credit unless the election was made this way, so a payroll credit you forgot cannot be added later with an amended return.

How do you claim it with Form 8974?

The amount on Form 6765, line 36 goes to Form 8974, Part 1, column (e). You attach Form 8974 to Form 941 and carry the result to line 11 of Form 941, the line for the qualified small business payroll tax credit for increasing research activities.

• Timing. The credit is first available in the first calendar quarter that begins after you file the income tax return making the election. A calendar-year corporation that files its 2025 return on April 15, 2026 can first use the credit on its Form 941 for the third quarter of 2026 (July 1 to September 30).
• Order of offset. The credit first reduces the employer share of social security tax, up to $250,000 per quarter, and any remainder reduces the employer share of Medicare tax for the quarter. It does not reduce income tax withheld from employees or the employees' share of FICA.
• Carryforward. Anything unused in a quarter carries forward to the next quarter until it is used up, and you keep reporting that year's election on Form 8974 until its remaining credit reaches zero.
• Corrections. Errors on a filed Form 8974 are corrected with Form 941-X and a corrected Form 8974.

Annual Form 943 and 944 filers follow the same rules on a yearly cycle.

What records do you need?

Treas. Reg. § 1.41-4(d) requires you to keep records "in sufficiently usable form and detail to substantiate that the expenditures claimed are eligible for the credit." Form 6765 now asks for more, too. Section E asks for the number of business components, officers' wages included in QREs, and whether you added new categories of expenses. Section G asks for information by business component. It is optional for tax years beginning before 2026 and required after that, unless you are a qualified small business making the payroll tax election, or your total QREs are $1.5 million or less, your average annual gross receipts are $50 million or less, and you are claiming the credit on an original return. When Section G is required, you report at least 80% of QREs by business component, up to 50 components. Claims on amended returns have their own information requirements.

In practice, keep these records as you go:

• A list of projects (business components), each with the technical uncertainty it addressed and the alternatives you tested.
• Time records or another documented basis for each person's share of qualified work, especially for founders and managers whose roles are mixed.
• Payroll registers that tie wage QREs to W-2 wages.
• Contractor agreements and invoices showing what work was done, where it was performed, and whether a customer or grant funded it.
• General ledger accounts that separate research costs from everything else, so the totals on Form 6765 tie to your books.

How does ClearBooks fit in?

ClearBooks can't decide whether your work is qualified research, and it does not prepare Form 6765 or Form 8974. Its Form 941 figures do not apply the research payroll credit, so your preparer adds that. What it does provide is the ledger behind the claim: payroll that posts W-2 wages to your books each pay run, accounts you can use to separate research costs, and a Form 1120 draft built from the same general ledger, so the credit and the return start from the same numbers. Our Form 1120 guide covers the rest of the return, and plans are on the pricing page.

This article is general information, not tax advice. Confirm your eligibility, credit calculation and elections with your CPA before you file.

Sources

• 26 U.S.C. § 41 (four-part test in (d), QREs in (b), ASC in (c)(4), payroll election in (h), amendment notes for Public Law 117-169 and 119-21)
• 26 U.S.C. § 3111(f) (credit against employer social security, then Medicare, tax) and § 280C(c) (coordination with Section 174A)
• Treas. Reg. § 1.41-4 (recordkeeping in (d); internal use software in (c)(6))
• IRS, Form 6765 and Instructions for Form 6765 (Rev. December 2025) ($500,000 limit, qualified small business, Sections D, E and G)
• IRS, Form 8974 and Instructions for Form 8974 (Rev. December 2024) (timing, offset order, carryforward)
• IRS, Form 941 (Rev. March 2026) (line 11)
• IRS, Rev. Proc. 2025-28 (Section 280C as amended)