Most small business owners have heard of the R&D tax credit. Fewer know there's also an R&D deduction and that Congress has been fighting over it for years. Even fewer know that you can often use both — or that the right combination depends entirely on your tax situation.
Here's the plain-English breakdown: what each one is, how they're calculated, what changed in 2022 and how to figure out which strategy puts more money back in your pocket.
A deduction reduces your taxable income. If you're in the 21% corporate tax bracket and you deduct $100,000 of R&D expenses, you save $21,000 in taxes.
A credit reduces your tax bill directly. A $21,000 R&D credit saves you $21,000 regardless of your tax bracket. Credits are almost always more valuable than deductions of the same dollar amount.
A $1 credit is worth more than a $1 deduction. A credit at the 21% tax rate is mathematically equivalent to a deduction of about $4.76. If you can get the credit, get the credit.
Before 2022, Section 174 let businesses immediately deduct 100% of R&D expenses in the year they occurred. Starting with the 2022 tax year, domestic R&D expenses must be amortized over 5 years (15 years for foreign R&D).
Section 174 allowed 100% immediate expensing of R&D costs. Most small businesses had been doing this for decades.
TCJA provision kicks in. Domestic R&D must now be amortized over 5 years. Many businesses owed unexpected taxes because they could only deduct 10% of their annual R&D spend in year 1.
Multiple bills proposed to restore immediate expensing. None passed into law.
Section 174 amortization remains in effect. Consult a tax advisor for the latest — this is actively contested territory.
The Section 174 rules have been subject to ongoing legislative proposals. The status as of your filing date may differ from what's described here.
| Factor | R&D Tax Credit (§41) | R&D Deduction (§174) |
|---|---|---|
| What it reduces | Tax owed directly | Taxable income |
| Value at 21% tax rate | Full face value | 21 cents per $1 deducted |
| Timing (domestic) | Current year | 5-year amortization (2022+) |
| Qualifying expenses | Wages, supplies, contract research | Broader — includes more indirect costs |
| Startup / pre-profit use | Yes, payroll tax offset | Limited (no income to offset) |
| Carryforward | 20 years | N/A (spread over amortization period) |
| Documentation burden | Moderate-high | Lower |
| Can use both? | Yes — with an adjustment (see below) | |
Yes — but there's an adjustment. If you claim the Section 41 R&D tax credit, you must reduce your Section 174 deduction by the amount of the credit. You can avoid this by electing the "reduced credit" under IRC Section 280C, which lets you keep your full deduction at a slightly lower credit rate.
If you're a profitable business in a high tax bracket, the reduced credit election (keeping your full deduction) often produces a better combined outcome. Your tax advisor should model both scenarios before you file.
*Illustrative only — not tax advice. Actual benefit depends on your full tax situation.
Scenario B produces roughly $26,000 more in net tax benefit for a profitable company at 21%. But this flips for companies with low taxable income or those using the payroll tax offset. Always model both.
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