The R&D Tax Credit: Who Actually Qualifies, and What Changed

This describes the rules as they stand in August 2026. The area was rewritten by the One, Big, Beautiful Bill and the reporting requirements are changing for the current tax year, so anything written before 2025 on this subject should be treated as history.

The credit is not about laboratories

Section 41 defines qualified research by a four-part test. Activity qualifies if it is:

• Undertaken to eliminate uncertainty about the capability, method or appropriate design of a business component.
• Technological in nature, relying on the physical or biological sciences, engineering or computer science.
• Intended to develop a new or improved business component — a product, process, technique, formula, invention or software.
• A process of experimentation: evaluating alternatives, testing, iterating.

Nothing in that requires a discovery, a patent or a success. Development that failed still qualifies, provided the uncertainty and the experimentation were real. What it does exclude is research after commercial production, adaptation of an existing component for a particular customer, duplication, surveys and studies, most software developed purely for internal use, and anything funded by someone else who bears the risk.

In practice, the businesses most often surprised to qualify are the ones designing or improving how they make something: a manufacturer reworking a process, a firm developing software it will sell, an engineering practice solving a problem it has not solved before. The businesses that most often assume they qualify and do not are the ones applying known methods competently to new jobs. Competence is not experimentation.

The deduction and the credit are two different things

This is the distinction that has caused the most confusion in the last few years, because the deduction side moved twice.

For tax years beginning after December 31, 2024, taxpayers may again deduct domestic research or experimental expenditures in the year paid or incurred, or elect to capitalize and amortize them over at least 60 months. Foreign research expenditures must still be capitalized and amortized over 15 years. That reversed the mandatory amortization that had applied since 2022 and that had produced tax bills on businesses with no profit.

The credit under Section 41 is separate and sits on top. You take the deduction for the cost and a credit for a portion of the qualifying spend. Claiming the credit does require a reduction to the deduction, or an election under Section 280C, so the two interact — but they are not alternatives.

The payroll offset, for businesses with no tax to offset

A credit against income tax is worth nothing to a company that is not paying income tax, which describes most companies doing serious development in their early years. The qualified small business election solves that: up to $500,000 of research credit can be applied against the employer share of Social Security tax and, for the portion above the Social Security cap, employer Medicare tax.

It is claimed on the income tax return and then taken on the employment tax return using Form 8974. The eligibility rules are specific — gross receipts limits and a limit on how many prior years you have had receipts — so this is a question to settle before the return is filed rather than after.

South Carolina has its own

South Carolina allows a credit equal to 5% of a taxpayer's qualified research expenses made in South Carolina, claimed on Form TC-18. Two conditions govern it:

• The credit is limited to 50% of the taxpayer's liability remaining after all other credits have been applied.
• Unused credit carries forward, but must be used before a taxable year beginning ten years or more after the year the expenses were incurred.

It is also dependent: to qualify for the state credit, the taxpayer must claim the federal Section 41 credit for the year. A business that decides the federal credit is not worth the documentation effort has also given up the state one, which changes the arithmetic on that decision.

The reporting change that matters this year

Form 6765 was redesigned, and Section G — business component detail — was optional for tax year 2025. For tax year 2026 and beyond it becomes mandatory for all filers, with optional reporting for qualified small businesses that check the box to claim the reduced payroll tax credit, and for taxpayers with total qualified research expenses of $1.5 million or less and gross receipts of $50 million or less.

That is a documentation requirement, not a form-filling requirement, and the distinction is the whole point. Section G asks for information organized by business component. A business that records development time as a single monthly figure cannot produce it retrospectively with any credibility. A business that tags time and cost to the specific product, process or project as the work happens can.

Which means the work is happening now, in the current tax year, not at filing. If you intend to claim the credit for 2026, the time to change how the work is recorded is before the rest of the year is recorded the old way.

What a real claim looks like

• Wages for employees performing, directly supervising or directly supporting qualified research — usually the largest component.
• Supplies consumed in the research, excluding land and depreciable property.
• Contract research, generally at 65% of the amount paid, and only where you retain rights and bear the economic risk.
• Records that tie each of those to a specific business component and to the uncertainty being resolved.

A word about the market around this credit. It attracts contingency-fee firms that produce large claims on thin documentation, and the credit is an examination priority. A claim that cannot survive being asked "which business component, and what was uncertain about it" is a liability rather than an asset. If a provider is not asking you that question, they are not building the file that the current version of Form 6765 asks you to file.

Whether your activity qualifies is a facts question and this article does not answer it. It does tell you what the facts have to look like, which is enough to know whether the conversation is worth having.