Short answer. You can claim both. Idaho runs its own credit equal to 5 percent of the increase in your Idaho research over a base, separate from the federal Section 41 credit, so the same in-state work earns both. The Idaho credit is nonrefundable and carries forward an unusually long 14 years.
Key facts
| Claim both? | Yes, on the same Idaho research |
|---|---|
| Federal rate | 20% regular / 14% ASC |
| Idaho rate | 5% of the increase in Idaho research over a base |
| Idaho refundable? | No |
| Forms | Form 6765 (federal) + Form 67 (Idaho) |
Two credits on the same research
Idaho computes its own credit on Idaho expenses; the federal credit runs on your nationwide expenses.
The federal Section 41 credit is claimed on Form 6765 with your federal return. Idaho's credit is claimed on Form 67 with the Idaho return, and the same research performed in Idaho can support both in the same year.
Idaho uses the federal Section 41 definition of qualified research but applies its 5 percent rate to the increase in your Idaho research over a base, so the federal work is the basis for the state claim.
Federal Section 41 vs. Idaho, factor by factor
Idaho pairs a modest rate with an unusually long 14-year carryforward.
| Factor | Federal Section 41 | Idaho |
|---|---|---|
| What it is | Credit for increasing research activities | Credit for Idaho research activities |
| Credit rate | 20% regular / 14% ASC | 5% of the increase in Idaho QRE over a base |
| Refundable | No - a QSB may offset up to $500,000 of payroll tax under Section 41(h) | No |
| Carryforward | 20 years, with a 1-year carryback | 14 years, no carryback |
| Where research must occur | United States | Idaho only |
| How you claim it | Form 6765 with the federal return | Form 67 with the Idaho return |
| Claim alongside the other? | Yes, on the same underlying QRE | Yes, on the same underlying QRE |
| Documentation | Four-part test and QRE substantiation (Treas. Reg. 1.41-4) | Uses the Section 41 definition, Idaho research only |
Where Idaho differs from federal
Two differences matter most when you claim both.
A long carryforward at a modest rate. Idaho's 5 percent rate is lower than the federal 20 percent, but unused credit carries forward 14 years, longer than many states. Idaho uses the regular method only, not the federal Alternative Simplified Credit, and only research conducted in Idaho counts.
A deduction tradeoff. If you deducted your research costs federally under Section 174, Idaho requires you to add that deduction back to claim the credit, so the Idaho credit and the federal research deduction cannot both reduce Idaho income. This does not affect your ability to claim the federal Section 41 credit alongside the Idaho credit.
One evidence base for both
The records that prove the federal claim are what Idaho relies on too.
Because Idaho uses the Section 41 definition of qualified research, the four-part test analysis and the wage, contractor, and supply records that substantiate your federal credit under Treas. Reg. 1.41-4 support the Idaho claim, limited to the in-state share. You build the evidence once.
R&D Binder documents the federal Section 41 four-part test that both credits stand on, with Idaho handled as a state add-on from the same evidence. Whether your facts qualify, and which credits to claim, is a determination for your CPA.
More on Idaho's R&D credit
The full state overview, the federal Section 41 work it builds on, and related state guides:
Sources
Every claim on this page traces to a primary authority. Each source below is independent and verifiable.
- Idaho Code 63-3029G (credit for Idaho research activities) - Idaho Legislature
- 26 U.S.C. § 41 (credit for increasing research activities) - Cornell Law School, Legal Information Institute
- IRS, About Form 6765 - Internal Revenue Service
- Treas. Reg. § 1.41-4 (recordkeeping and substantiation of qualified research) - Cornell Law School, Legal Information Institute
Get documentation built to survive an exam
R&D Binder produces the federal Section 41 binder and the Idaho state workpaper from one engagement, both built to survive an exam.