Question 1

What is the R&D Tax Credit?

Accepted Answer

The R&D Tax Credit (Internal Revenue Code §41) is a federal tax credit for businesses that invest in technical research — software development, product engineering, process improvement, manufacturing experimentation, life-sciences work. It is one of the most under-claimed business credits in the U.S. tax code: the IRS estimates only ~25% of eligible companies actually claim it. The credit is dollar-for-dollar against tax liability (more valuable than a deduction, which only reduces taxable income). For qualified small businesses there is also a payroll-tax election under §41(h) that lets pre-revenue or low-revenue startups apply up to $500K of the credit against employer FICA — making it useful even before the company owes any income tax. Source: https://www.law.cornell.edu/uscode/text/26/41.

Question 2

What counts as a Qualified Research Expense (QRE)?

Accepted Answer

QREs are the costs of activities that pass the four-part test in Treas. Reg. §1.41-4(a)(3): (1) technological in nature — relies on principles of physical/biological sciences, engineering, or computer science; (2) permitted purpose — developing or improving a product, process, formula, software, technique, or invention; (3) elimination of uncertainty — the activity addresses a technical uncertainty the company cannot resolve from publicly available knowledge; (4) process of experimentation — systematic evaluation of alternatives (modeling, prototyping, A/B testing, simulation, trial-and-error). Eligible expense categories: in-house wages of employees performing/supporting/supervising R&D, supplies consumed in research, 65% of contract research paid to third parties, and rental of cloud computing or research equipment. Routine work, market research, post-launch QA, and management studies do NOT qualify.

Question 3

What's the difference between the Regular Credit Method and the ASC?

Accepted Answer

Two methods exist for computing the §41 credit. The Regular Credit Method (RCM) applies a 20% rate to QREs above a base amount derived from a 1984–1988 fixed-base percentage and a four-year average of gross receipts. RCM is mathematically powerful for mature companies with stable QRE history, but the base calculation requires data many companies don't have. The Alternative Simplified Credit (ASC) — what this calculator implements — applies 14% to current QREs above 50% of the average prior-three-year QREs, or 6% of current QREs when no usable three-year history exists. ASC is simpler, requires only recent data, and is what the overwhelming majority of startups and small businesses use. Once elected, ASC must be used consistently year-over-year. Source: IRC §41(c)(5).

Question 4

What is the payroll tax election?

Accepted Answer

The payroll-tax election under IRC §41(h) lets a Qualified Small Business apply up to $500,000 of its R&D credit against the employer's share of FICA payroll tax (the 6.2% Social Security portion, then any remainder against Medicare), instead of waiting to use it against income tax. This is the difference-maker for early-stage startups: without it, a pre-revenue company has no income tax liability to offset, so the credit just becomes a carryforward sitting on the balance sheet. With the election, the credit reduces actual cash payroll-tax payments quarter by quarter starting the quarter after the return is filed. Source: https://www.irs.gov/businesses/research-credit.

Question 5

Who qualifies as a Qualified Small Business for the payroll tax election?

Accepted Answer

Two tests under IRC §41(h)(3), both must pass: (1) current-year gross receipts under $5,000,000, AND (2) the entity has had gross receipts in no more than 4 prior tax years (i.e., the entity is in its 5th year of receipts or earlier). The 'gross receipts' test counts ANY year with $1+ of receipts as a year-with-receipts — a single $500 invoice in 2020 counts as a full year. The age test is what disqualifies most otherwise-small companies: if you incorporated in 2019 and started selling in 2020, you've already used 5 years and lose access in 2025. Founders should make the §41(h) election aggressively in the first eligible years rather than waiting.

Question 6

How did the 2022 Inflation Reduction Act change this?

Accepted Answer

The Inflation Reduction Act of 2022 (Public Law 117-169, §13902) doubled the §41(h) payroll-tax-credit cap from $250,000 to $500,000, effective for tax years beginning after December 31, 2022. The IRA also expanded the credit to apply against the 1.45% Medicare portion of employer FICA after the 6.2% Social Security portion is fully offset — previously the credit could only reduce Social Security tax. The combined effect: a 2026-tax-year filer with $5M of QREs running the 6% startup formula gets a $300K credit, all of which can offset payroll tax in the year following filing. Pre-IRA, that same filer would have been capped at $250K with $50K stranded as a carryforward.

Question 7

Can I claim R&D credits for work done by contractors?

Accepted Answer

Yes — but only at 65% of the contracted amount, per IRC §41(b)(3). The 35% haircut reflects the contractor's profit margin, which Congress excluded from the credit base. Three conditions must hold: (1) the contract is for the performance of qualified research, not for the delivery of a finished product; (2) the U.S. company bears the financial risk of the research succeeding; (3) the U.S. company retains substantial rights in the resulting IP. Foreign-performed research generally does NOT qualify, even when paid for by a U.S. company. The 65% rule has driven a meaningful structural choice: many startups bring R&D in-house specifically to capture the full QRE rate (100% of wages vs 65% of contract spend).

Question 8

What documentation do I need to substantiate the credit?

Accepted Answer

Three categories of contemporaneous documentation, ideally maintained throughout the year rather than reconstructed at filing time: (1) Project-level records — descriptions of the research activities, the technical uncertainty being resolved, the alternatives evaluated, and how the four-part test was met for each project. (2) Expense substantiation — payroll registers showing time spent on qualified vs non-qualified work (a time-tracking system that tags work to projects is the gold standard), supply invoices traceable to specific R&D projects, contractor agreements with §1.41-2(e) language preserving rights and risk. (3) Financial records — gross receipts history (for QSB eligibility and ASC base calculation), prior-year QRE schedules, Form 6765 backup. The IRS has been tightening §41 audit standards since 2022 with the Form 6765 'Section G' detailed-information requirement (effective 2025). Treat this as audit-grade from day one.

R&D Tax Credit Calculator (Section 41)

What this means

Worked example

Frequently asked questions

Show the math