Section 280C of the Internal Revenue Code addresses the interaction between the R&D tax credit and the deductions a taxpayer may claim for research expenses. This page explains the current rules and the election. It is educational and is not individualized tax advice. For the conceptual distinction between credits and deductions, see our page on R&D tax credit vs. tax deduction.
The Interaction Between the Credit and Deductions
Under Section 280C(a), a taxpayer that claims the research credit under Section 41 generally cannot deduct the full amount of research expenses that generated the credit. Instead, the deductible portion of the research expenses is reduced by the amount of the credit. In plain terms, the taxpayer cannot "double-dip" — claiming both the full credit and the full deduction for the same expenses.
This interaction exists because the research expenses serve two purposes: they generate a credit (which reduces tax liability) and they would otherwise be deductible (which reduces taxable income). Section 280C prevents the taxpayer from getting both benefits in full for the same dollars.
The Reduced-Credit Election
Under Section 280C(c), a taxpayer may elect to take a reduced credit instead of reducing the deduction. If the taxpayer makes this election, the credit is reduced (rather than the deduction), and the taxpayer retains the full deduction for research expenses. The election is made on Form 6765.
The reduced-credit election effectively lets the taxpayer choose which benefit to reduce — the credit or the deduction. The choice affects the overall economics of the credit claim.
When the Election Is Made
The Section 280C election is made on Form 6765, Credit for Increasing Research Activities. The current form (12/2025 revision) includes a checkbox or item for the Section 280C election. The Instructions for Form 6765 describe how the election is indicated on the form. The election is generally made for the taxable year to which the credit applies.
Why the Election Affects the Economics
The election matters because the credit and the deduction have different economic effects:
- Reducing the deduction (no election). The taxpayer keeps the full credit but loses a portion of the deduction. The lost deduction would have reduced taxable income; its value depends on the taxpayer's tax rate.
- Electing the reduced credit. The taxpayer keeps the full deduction but receives a smaller credit. The credit is reduced, but the deduction continues to reduce taxable income.
Which choice is more favorable depends on the taxpayer's tax rate, the amount of the credit, the amount of the deduction, and other factors. The choice is not universally optimal in one direction. For more on the distinction between credits and deductions, see our page on R&D tax credit vs. tax deduction.
Relationship to Form 6765
The Section 280C election is indicated on Form 6765. The current instructions describe the election mechanism. The election affects how the credit and the deduction are reported on the taxpayer's return. For more on the form, see our page on Form 6765 sections explained.
Relationship to Section 174
Separately from Section 280C, Section 174 (and Section 174A, as amended) governs the treatment of research and experimental expenditures as deductions or amortized amounts. The Section 174 rules interact with, but are distinct from, the Section 41 credit and the Section 280C election. This page does not provide a full treatment of Section 174; readers should consult the current statute and professional review for the Section 174 rules that apply to a given tax year.
A Hypothetical Illustration
The following is a hypothetical illustration for educational purposes only. It does not represent any actual taxpayer, does not calculate a personalized tax result, and does not state a filing recommendation.
Suppose a taxpayer has a tentative research credit of $50,000 and research expenses that would otherwise be fully deductible. Under Section 280C(a), the deductible portion of the research expenses would be reduced by $50,000. If the taxpayer elects the reduced credit under Section 280C(c), the credit would be reduced instead, and the full deduction would be retained. The specific reduction in the credit under the election is determined under the statutory formula, and the overall result depends on the taxpayer's tax rate and facts.
This illustration explains the concept, not a specific outcome. The actual result depends on the taxpayer's facts.
What This Page Does Not Do
This page does not:
- state which election is universally optimal (it depends on the facts);
- provide individualized advice on whether to make the election;
- provide a full treatment of Section 174 or Section 174A;
- calculate the exact reduction under the reduced-credit election (which depends on the statutory formula and the taxpayer's facts).
Documentation Considerations
The Section 280C election and the underlying credit and deduction amounts should be supported by records. The research expenses, the credit computation, and the election choice should all be documented. For more, see our page on R&D tax credit documentation.
Questions for Your Tax Professional
- Should I make the Section 280C reduced-credit election, or should I reduce the deduction?
- How does the election interact with my tax rate and overall tax position?
- How does the election interact with the Section 174 rules for my research expenses?
- How is the election indicated on Form 6765 for my tax year?
- What records support my election choice?
Key Takeaway
Section 280C addresses the interaction between the R&D tax credit and the deductions for research expenses. A taxpayer claiming the credit may need to either reduce the deduction by the credit amount or elect a reduced credit on Form 6765. The election affects the overall economics and is not universally optimal in one direction. Because the determination depends on specific facts, professional tax review is appropriate. For the credit-deduction distinction, see our page on R&D tax credit vs. tax deduction.