R&D Tax Credit Calculator

The four-part test comes before any arithmetic

An expense is a qualified research expense only if the activity it paid for passes four tests, all of them, per business component:

1. Permitted purpose. The work aims to improve the function, performance, reliability or quality of a product, process, software, technique, formula or invention.
2. Technological in nature. It relies on the hard sciences: engineering, computer science, physics, chemistry, biology.
3. Elimination of uncertainty. At the outset you did not know whether the result could be achieved, or how, or how the thing should be designed.
4. Process of experimentation. You evaluated alternatives, by modelling, simulation, systematic trial and error, or testing.

Most of what gets excluded is excluded here rather than at the arithmetic. Research after commercial production, adaptation of an existing product to a particular customer, reverse engineering, routine data collection, market research, and anything funded by someone else who bears the risk, all fail before a number is reached.

This is the part a calculator cannot do for you. The tool asks for a qualified time percentage because that percentage is the output of this judgement, applied honestly.

The two methods

Alternative simplified credit. Fourteen percent of the amount by which this year's QREs exceed half of the average QREs for the three preceding years. If you had no QREs in any one of those three years, the rate drops to six percent and it is applied to the current year's QREs with no base subtracted.

Regular credit. Twenty percent of the amount by which this year's QREs exceed a base amount, where the base is your fixed-base percentage applied to your average gross receipts for the four preceding years, floored at fifty percent of current-year QREs.

The floor is why the regular method rarely wins for a company whose revenue is growing faster than its research spend, and why it often does win for a company whose research spend has grown faster than its revenue. Compute both. The tool does.

What counts as a qualified expense

Four categories, and no others:

• Wages for performing, directly supervising, or directly supporting qualified research. W-2 Box 1 wages, not fully loaded cost: not benefits, not employer payroll tax, not equity compensation that is not in Box 1.
• Supplies used or consumed in the research. Tangible property that is not capital and is not land.
• Contract research, at a statutory fraction of the amount paid, and only where you keep the economic risk and substantial rights in the result. A fixed-price contract where the vendor bears the risk of failure generally does not qualify.
• Rental or lease of computers used in qualified research, which is how cloud compute for development and test environments enters the calculation.

Everything else is out. Capital equipment, overhead, rent, travel, patent filing and legal fees are not QREs, however genuinely they supported the work.

Section 174A, and why older guidance is wrong

For tax years beginning after December 31, 2024, domestic research expenditures are deductible in the year paid or incurred, under Section 174A. The five-year amortisation regime that applied for tax years 2022 through 2024 is gone for domestic spend, permanently. Foreign research expenditures are still amortised.

Two consequences this page's arithmetic accounts for:

• An expense has to be a domestic research expenditure under Section 174A to be a qualified research expense under Section 41 at all. The two sections are now coupled in a way they were not before.
• You still cannot both take the full credit and keep the full deduction. Either reduce the deduction by the credit, or elect the reduced credit, which is 79% of the full one, on a timely filed return. For a C corporation at the 21% rate the two come out exactly the same, because 79% is one minus that rate. They differ at any other marginal rate, which is every pass-through owner's case: at 37%, keeping the full credit and losing the deduction is worth 63% of the credit, and electing is worth 79%. The tool shows both at the rate you give it.

A great deal of R&D credit content on the web still describes the 2022 to 2024 amortisation rules as current. Check the date on anything you read about this, including this page, and the tool prints the tax year it used and the date its rules were last verified.

Payroll offset, for a company with no tax to offset

A qualified small business may elect to apply part of the credit against the employer share of payroll tax rather than income tax. This is the provision that makes the credit worth claiming for a company that has never been profitable.

To qualify, gross receipts for the election year must be under the threshold, and you must be within five years of the first year you had any gross receipts. The election is made on the credit form with the return, then claimed on the payroll tax return. The cap applies per year against the employer share of Social Security and Medicare tax, and the election is available for a limited number of years.

The tool prints the current thresholds and caps with the year they apply to, because all of them have changed within the last several years and will change again.

What you have to file

The credit is claimed on a form that was substantially redesigned, and the new business component reporting section is the part to plan for. Where it applies, you report by business component, in descending order of expense, up to a stated share of your total QREs or a maximum number of components, with the remainder in aggregate.

It is optional for tax years beginning before 2026 and required for tax years beginning after 2025, which makes this year the one to start keeping records by component.

There are two exceptions. A qualified small business that elects the payroll offset is outside it. So is a claimant whose QREs are under one threshold AND whose average annual gross receipts for the three prior years are under another, both measured at controlled group level, filing the credit on an original return. Two details in that sentence trip people up: the receipts test is a three-year average, not this year's figure, and an amended return does not qualify however small the claimant. For a smaller company the reporting burden is often lighter than the headline suggests.

This is why the tool asks how many business components you have. The credit is the same either way. The work is not.

The sample company the tool loads. Invented, and deliberately a company that is not obviously a startup.

Ardent Fluidics, Inc. designs and manufactures precision dosing pumps. Seventy-one employees, $19.4 million of revenue, profitable, in business eleven years. They have never claimed the credit, because nobody thought a pump company did research.

They do. In the 2026 tax year they ran a programme to get a new pump head to hold tolerance at a higher duty cycle, which took eleven months, four failed designs and a test rig built for the purpose.

Their QREs:

Their history: prior three years of QREs averaged $1,041,000, because the programme ramped. Base is 50% of that, $520,500.

The regular method, computed as well: with four-year average gross receipts of $17.1 million and a fixed-base percentage of 3% from their preparer, the computed base of $513,000 falls below the fifty percent floor, so the floor binds at $798,450, giving 0.20 x 798,450 = $159,690. The regular method wins by $8,994. The tool flags that the regular method's base has consequences in later years and sends them to their preparer rather than deciding for them.

Payroll offset: no. Gross receipts far exceed the threshold and the company is eleven years old. The credit goes against income tax, where they have liability to use it.

Substantiation: 2026 is a tax year beginning after 2025, so the business component section applies unless an exception does. Their three-year average gross receipts, about $17.6 million, are well inside that test. Their QREs of $1.6 million are not: they are over the QRE threshold, so the exception fails on QREs alone and they will have to report by business component. They have three: the pump head, the controller firmware, and the seal material programme. Three components is a manageable study.

What the first attempt got wrong. They initially entered design engineering at 100% qualified. The helper note sent them back: that team also does sustaining work on shipped products and customer-specific adaptations, neither of which qualifies. Seventy percent is the defensible figure and it is the one their time records can support. The honest input cost them $35,400 of estimated credit and is the reason the estimate is worth having.

This is an estimate of the federal credit under Section 41 and not tax advice. It does not decide whether your activities qualify, it accepts the qualified time percentages you enter, and it cannot see your contemporaneous records. It excludes all state credits. It does not handle controlled group aggregation, partnership or S corporation pass-through allocation, the special rules for internal-use software, or acquisitions and dispositions during the year, each of which can change the answer materially. It produces no filing and nothing you can attach to a return. Rates, thresholds and caps are as of the tax year shown on the tool and change frequently. Have a qualified tax professional confirm anything you intend to claim.