Common Disqualifiers

Not every technical activity qualifies for the R&D tax credit. IRC Section 41(d)(4) lists specific exclusions. Understanding what does not qualify is as important as understanding what does.

Funded research

Research funded by another party — through a grant, contract, or other arrangement — does not generate QREs for the taxpayer performing it. If someone else bears the financial risk of the research, the credit belongs to the party paying for it, not the party performing it.

This commonly applies to:

Government grants or contracts where the funder retains rights to the research
Research performed under a contract where the client pays regardless of outcome
Joint ventures where one party funds and another performs

The key question: who bears the economic risk if the research fails? If the answer is someone other than the taxpayer claiming the credit, the research is funded and does not qualify.

Research after commercial production

Activities conducted after a product or process is ready for commercial sale or use generally do not qualify. Under IRC Section 41(d)(4)(A):

Testing or quality assurance performed after the product design is finalized and production has begun
Routine production monitoring
Troubleshooting production-line issues with known solutions
Minor refinements to a product already in the market, where there is no technological uncertainty

The nuance: if you are making a genuinely new or improved version of a product that involves new technological uncertainty, that is a new research effort — even if the prior version is already in production. The exclusion targets routine post-production activities, not ongoing R&D on future versions.

Adaptation of existing business components

Research to adapt an existing product or process for a specific customer — without involving technological uncertainty — does not qualify. Under IRC Section 41(d)(4)(B):

Customizing existing software for a client's specific requirements using established techniques
Modifying a standard product to fit a customer's specifications where the modification is routine
Configuring existing systems without resolving technical challenges

When adaptation does qualify: if the customization requires solving a genuine technical problem — if the adaptation involves uncertainty about whether it can be achieved, or how — then it may still meet the four-part test.

Foreign research

Research conducted outside the United States does not qualify for the federal R&D tax credit. Under IRC Section 41(d)(4)(F), only research performed within the U.S., Puerto Rico, or U.S. possessions generates QREs.

This means:

Wages paid to employees performing research abroad do not count
Contractor payments for research performed outside the U.S. do not count
Research conducted partially in the U.S. and partially abroad must be apportioned

Social sciences, arts, and humanities

The four-part test requires that the process of experimentation be technological in nature — relying on engineering, computer science, biological science, or physical science. Activities grounded in other disciplines do not qualify. Under IRC Section 41(d)(4)(G-I):

Market research and consumer surveys
Advertising and graphic design
Management studies and organizational research
Literary, historical, or artistic endeavors
Economic or financial modeling (unless it relies on computer science principles)

Routine quality control (IRC Section 41(d)(4)(D)(v))

Routine or ordinary testing or inspection for quality control is excluded. Testing performed after a process is established, using known methods, to verify that output meets specifications is not qualified research.

Testing conducted to resolve a technical uncertainty — where the outcome of the test is genuinely unknown and informs a design or process decision — can still qualify. The distinction is between routine verification and investigative experimentation.

Other statutory exclusions

Internal-use software (IRC Section 41(d)(4)(E))

Software developed for the taxpayer's own internal use faces a higher bar. It must meet the standard four-part test plus three additional requirements under the high threshold of innovation test (26 CFR 1.41-4(c)(6)):

The software is innovative (the result is not commercially available)
The development involves significant economic risk
The software is not commercially available for purchase, lease, or license

Style, taste, cosmetic and seasonal design factors (IRC Section 41(d)(3)(B))

Research relating to style, taste, cosmetic or seasonal design factors is excluded by name, regardless of how rigorous the testing was. This exclusion commonly affects food and beverage, cosmetics, fashion, and consumer product companies.

Surveys and studies (IRC Section 41(d)(4)(D))

Efficiency surveys, management function studies, market research, and routine data collection do not qualify.

The line between qualifying and non-qualifying

Many real-world activities fall near the boundary. The same project can include both qualifying and non-qualifying work. For example, developing a new manufacturing process (qualifying) and then monitoring its production output (non-qualifying) are different phases of the same project — only the research phase generates QREs.

Proper documentation is critical to drawing this line accurately. See Documentation Requirements for what the IRS expects.

What Qualifies — the four-part test for qualifying activities
Qualified Research Expenses — what expenses count
Documentation Requirements — substantiation requirements
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