What is the R&D tax credit?

The R&D tax credit (Section 41) is a federal tax incentive that rewards companies for investing in research and development activities in the US. Startups can claim up to $500,000 per year against payroll taxes, even if they have no income tax liability.

How much is the R&D tax credit worth?

Using the Alternative Simplified Credit method, the credit is approximately 14% of qualifying research expenses (QREs) that exceed 50% of the average QREs for the prior 3 years. Pre-revenue startups can apply up to $500,000/year against payroll taxes.

What qualifies as R&D for the tax credit?

Qualifying activities include developing new products or software, improving existing products, building prototypes, and developing new processes. The work must involve technological uncertainty and a process of experimentation. Most software development qualifies.

Can a pre-revenue startup actually use the R&D tax credit?

Yes. Qualified small businesses (less than $5M in gross receipts and no gross receipts more than 5 years ago) can elect to apply up to $500,000 of federal R&D credit against payroll taxes, specifically the employer portion of FICA. This means cash savings even with zero income tax liability. The Inflation Reduction Act doubled the cap from $250,000 for tax years beginning after 2022: the first $250,000 offsets the employer share of Social Security tax and the second $250,000 offsets the employer share of Medicare tax.

How did Section 174 change R&D for startups, and what applies now?

For tax years 2022 through 2024, companies had to capitalize and amortize R&D expenses (5 years for US R&D, 15 years for foreign) instead of deducting them, which created surprise tax bills for many startups. The One Big Beautiful Bill Act added Section 174A, restoring the immediate deduction for domestic R&D in tax years beginning after December 31, 2024. Foreign R&D still amortizes over 15 years. The R&D credit itself was not affected and stacks with the deduction.

How do you calculate the R&D tax credit, step by step?

Most startups use the Alternative Simplified Credit: 14% of qualified research expenses (QREs) above half of the average QREs for the prior three years. With QREs of $600,000, $800,000, and $1,000,000 over the last three years and $1,400,000 this year, the base is $400,000 and the credit is 14% of $1,000,000, or $140,000. If any one of the prior three years had no QREs, the credit is 6% of current-year QREs instead. The calculator runs this math on your numbers; a filed claim still needs a documented study.

Should a startup use the regular credit or the Alternative Simplified Credit?

Most use the Alternative Simplified Credit because it needs only three years of research spending. The regular credit is 20% of research spending above a base tied to your gross receipts, and the base can never be less than half of this year's spending, so the regular credit tops out at 10% of research spending. For a pre-revenue company with little research history, that 10% can beat the ASC's 6% first-year rate, but it needs more records. Ask your CPA to run both before you file.

What documentation do I need to claim the R&D tax credit?

You need contemporaneous documentation: project descriptions, time tracking by employee and project, payroll records, contractor invoices, and supply purchase records. The IRS requires Form 6765 with the return, plus the IRS's 5-item disclosure (employees, expenses, business components, activities, intent). StartupCFO can run the study and filing as a scoped Custom Project.

Can I claim R&D credits for prior years?

Often, yes. You can generally amend a return that is still open under the statute of limitations, usually three years from filing, to claim a missed research credit. IRS rules since 2015 let you elect the Alternative Simplified Credit on that amended return, as long as no research credit was already claimed for that year. Unused income tax credit carries forward for up to 20 years. The payroll tax election is different: it must be made on a timely filed original return, including extensions, and cannot be made on an amended return, so a missed year cannot become payroll tax savings later. State rules vary.

Is this estimator the same as an R&D tax credit study?

No. The estimator applies the Alternative Simplified Credit formula to your inputs to produce a planning estimate. An actual claim requires a study that documents qualified research expenses project by project, ties them to the four-part test, and supports the amounts reported on Form 6765. Use the estimate to decide whether a study is worth pursuing, then involve a CPA to prepare and file the claim.

Free Tool

R&D Tax Credit Calculator

Calculate your federal R&D tax credit in seconds, and see how the calculation works. Built for software startups using the Alternative Simplified Credit method.

Current year QREs

W-2 Engineer Wages (annual $)

Contractor R&D Costs (annual $)

Cloud/Hosting Costs (annual $)

R&D Supplies (annual $)

Prior-year history

Avg QRE — prior 3 years ($)

The credit is 14% of QRE above 50% of this 3-year average. If any ONE of those three years had no QREs, the rate is instead 6% of your full QRE.

One or more of the last three years had no qualified research expenses (§41(c)(5)(B) then gives the 6% rate, whatever the average says)

Current-year gross receipts ($)

QSB payroll offset requires under $5M in current-year gross receipts.

We had gross receipts in any year more than 5 tax years ago

Companies with older revenue history don't qualify for the payroll-tax offset, even if current receipts are below $5M.

How This Calculator Works

The credit behind the numbers

The federal research credit (IRC Section 41) rewards companies for developing new or improved products, processes, or software in the US. An activity qualifies if it passes a four-part test: it aims to create a new or improved business component, faces genuine technical uncertainty at the outset, works through that uncertainty with a process of experimentation (prototyping, testing, systematic trial and error), and relies on hard sciences such as engineering or computer science. Most non-routine software development clears the test, and both successful and failed efforts can qualify. Routine maintenance, bug fixes, and cosmetic changes do not.

Why pre-revenue startups still benefit

A qualified small business, one with under $5M in gross receipts for the credit year and no gross receipts more than 5 years back (roughly, within 5 years of first revenue), can elect to apply up to $500,000 per year of the credit against the employer portion of payroll taxes. That turns the credit into quarterly cash savings even with zero income tax liability. The claim goes on Form 6765 with your annual return, then flows to payroll via Form 8974.

How to calculate the R&D tax credit: a worked example

The Alternative Simplified Credit is 14% of your qualified research expenses (QREs) that exceed half of your average QREs for the prior three years. Say you spent $600,000, $800,000, and $1,000,000 on QREs over the last three years and $1,400,000 this year. The three-year average is $800,000, half of that is $400,000, and the excess is $1,000,000, so the credit is $140,000. If any one of the prior three years had no QREs, the credit is 6% of this year's QREs instead: $84,000 on $1,400,000. Companies that elect the reduced credit under Section 280C claim 79% of it rather than reducing their research expense deduction.

For tax years beginning after 2025, most claims also need Section G of Form 6765, which reports QREs by business component. Qualified small businesses taking the payroll tax election are exempt, as are original returns with $1.5M or less in QREs and average gross receipts of $50M or less. Confirm current-year rules with a CPA before filing.

What counts as a qualified research expense

Expense	What counts	Share included
Wages	W-2 wages of employees who do, directly supervise, or directly support the research, for the time spent on it	100% of the qualifying time
Contract research	US contractors doing qualified research for you, where you bear the risk and keep rights to the results	65%
Cloud and computers	Rented compute used for development and testing environments, not production hosting	100% of the research use
Supplies	Materials used up in research, such as prototype parts; not equipment you depreciate	100%

Research funded by a customer or a grant, work done outside the US, and work after a product is commercially released do not count. Founders' salaries count only for the time they spend on qualifying engineering work.

Pre-revenue example: how the payroll offset pays out

A seed-stage software company with no revenue spends $900,000 on qualified research in 2026, its first year of research. With no prior-year spending, the Alternative Simplified Credit is 6%: $54,000. On about $1M of payroll, its employer Social Security tax runs about $15,000 a quarter. It files its 2026 return with Form 6765 and the payroll election in March 2027, and starting with the next calendar quarter it reports the credit on Form 8974 with each Form 941. The $54,000 comes back as lower payroll tax over roughly four quarters, and any balance carries to later quarters.

Regular credit vs the Alternative Simplified Credit

The regular credit is 20% of qualified research expenses above a base amount set from your historical ratio of research spending to gross receipts. The base can never fall below half of this year's spending, so the regular credit tops out at 10% of research spending. For a company with little revenue and a short research history, that can beat the 6% first-year ASC rate: about $90,000 instead of $54,000 in the example above. It needs more records and more judgment, which is why most startups default to the ASC. This estimator implements the ASC; have your CPA run both methods before you file.

State R&D tax credits

More than 30 states offer a research credit on top of the federal one. Each sets its own rate, base calculation and limits, and only some let small companies get cash back or sell unused credits. State credits generally require the research to happen in that state, so where your engineers work matters as much as what they build. This estimator covers the federal credit only.

What the estimator does, and when to involve a CPA

This tool applies the Alternative Simplified Credit formula to the numbers you enter: roughly 14% of qualified research expenses above 50% of your prior 3-year average, with a reduced-rate startup method for first-time filers. It produces a planning estimate, not a filing position. An actual claim requires a study that documents QREs project by project: time tracking, payroll records, contractor invoices, and evidence tying each activity to the four-part test. Involve a CPA before you file, both to substantiate the claim and to avoid common disqualifiers like funded client work or inflated wage allocations. Start with our R&D tax credits guide or see how our startup tax service handles the study and filing.

Frequently Asked Questions

What is the R&D tax credit?: The R&D tax credit (Section 41) is a federal tax incentive that rewards companies for investing in research and development activities in the US. Startups can claim up to $500,000 per year against payroll taxes, even if they have no income tax liability.
How much is the R&D tax credit worth?: Using the Alternative Simplified Credit method, the credit is approximately 14% of qualifying research expenses (QREs) that exceed 50% of the average QREs for the prior 3 years. Pre-revenue startups can apply up to $500,000/year against payroll taxes.
What qualifies as R&D for the tax credit?: Qualifying activities include developing new products or software, improving existing products, building prototypes, and developing new processes. The work must involve technological uncertainty and a process of experimentation. Most software development qualifies.
Can a pre-revenue startup actually use the R&D tax credit?: Yes. Qualified small businesses (less than $5M in gross receipts and no gross receipts more than 5 years ago) can elect to apply up to $500,000 of federal R&D credit against payroll taxes, specifically the employer portion of FICA. This means cash savings even with zero income tax liability. The Inflation Reduction Act doubled the cap from $250,000 for tax years beginning after 2022: the first $250,000 offsets the employer share of Social Security tax and the second $250,000 offsets the employer share of Medicare tax.
How did Section 174 change R&D for startups, and what applies now?: For tax years 2022 through 2024, companies had to capitalize and amortize R&D expenses (5 years for US R&D, 15 years for foreign) instead of deducting them, which created surprise tax bills for many startups. The One Big Beautiful Bill Act added Section 174A, restoring the immediate deduction for domestic R&D in tax years beginning after December 31, 2024. Foreign R&D still amortizes over 15 years. The R&D credit itself was not affected and stacks with the deduction.
How do you calculate the R&D tax credit, step by step?: Most startups use the Alternative Simplified Credit: 14% of qualified research expenses (QREs) above half of the average QREs for the prior three years. With QREs of $600,000, $800,000, and $1,000,000 over the last three years and $1,400,000 this year, the base is $400,000 and the credit is 14% of $1,000,000, or $140,000. If any one of the prior three years had no QREs, the credit is 6% of current-year QREs instead. The calculator runs this math on your numbers; a filed claim still needs a documented study.
What counts as a qualified research expense?: Four kinds of US spending: wages for employees who perform, directly supervise, or directly support qualified research; supplies used up in the research; amounts paid to rent computers or cloud capacity used for development and testing, not production hosting; and 65% of what you pay US contractors to do qualified research for you, if you bear the risk and keep rights to the results. Research funded by a customer or grant, research done outside the US, and work after commercial release do not count.
Should a startup use the regular credit or the Alternative Simplified Credit?: Most use the Alternative Simplified Credit because it needs only three years of research spending. The regular credit is 20% of research spending above a base tied to your gross receipts, and the base can never be less than half of this year's spending, so the regular credit tops out at 10% of research spending. For a pre-revenue company with little research history, that 10% can beat the ASC's 6% first-year rate, but it needs more records. Ask your CPA to run both before you file.
Do states offer an R&D tax credit too?: Yes. More than 30 states have their own research credit on top of the federal one. Each sets its own rate, base calculation and limits, and only some let small companies get cash back or sell unused credits. A state credit generally requires the research to be done in that state, so it matters where your engineers work.
What documentation do I need to claim the R&D tax credit?: You need contemporaneous documentation: project descriptions, time tracking by employee and project, payroll records, contractor invoices, and supply purchase records. The IRS requires Form 6765 with the return, plus the IRS's 5-item disclosure (employees, expenses, business components, activities, intent). StartupCFO can run the study and filing as a scoped Custom Project.
Can I claim R&D credits for prior years?: Often, yes. You can generally amend a return that is still open under the statute of limitations, usually three years from filing, to claim a missed research credit. IRS rules since 2015 let you elect the Alternative Simplified Credit on that amended return, as long as no research credit was already claimed for that year. Unused income tax credit carries forward for up to 20 years. The payroll tax election is different: it must be made on a timely filed original return, including extensions, and cannot be made on an amended return, so a missed year cannot become payroll tax savings later. State rules vary.
Is this estimator the same as an R&D tax credit study?: No. The estimator applies the Alternative Simplified Credit formula to your inputs to produce a planning estimate. An actual claim requires a study that documents qualified research expenses project by project, ties them to the four-part test, and supports the amounts reported on Form 6765. Use the estimate to decide whether a study is worth pursuing, then involve a CPA to prepare and file the claim.

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Estimates only. This tool is for planning and is not tax or legal advice. Your actual position depends on facts this calculator does not see, so confirm the numbers with a qualified CPA or attorney before you file.

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