Qualified research expense wages are the taxable compensation you pay employees for time spent performing, directly supervising, or directly supporting qualified research inside the United States. Under IRC Section 41(b), that compensation tracks the Section 3401(a) definition of wages, which in practice means the amount reported in Box 1 of Form W-2.1Internal Revenue Service. Audit Techniques Guide – Credit for Increasing Research Activities IRC 41 – Qualified Research Expenses Whether a given paycheck contributes to the credit depends on what the employee did, how much of their time they spent on it, and whether the pay itself was subject to federal income tax withholding.
What Pay Counts as Wages
The starting point is taxable wages under Section 3401(a): the number in Box 1 of the W-2. Base salary, cash bonuses, and overtime pay all qualify.1Internal Revenue Service. Audit Techniques Guide – Credit for Increasing Research Activities IRC 41 – Qualified Research Expenses
Compensation that escapes federal income tax withholding is out. Employer 401(k) contributions, employer-paid health insurance premiums, and other non-taxable fringe benefits do not count as QRE wages, even for an employee whose work otherwise qualifies in full.1Internal Revenue Service. Audit Techniques Guide – Credit for Increasing Research Activities IRC 41 – Qualified Research Expenses
Stock Option Income
When an employee exercises a stock option and the spread between the exercise price and the market price appears as taxable wages, that amount can be included in QRE wages. The catch is the timing test: the IRS looks at the grant year, not the exercise year, to decide whether the underlying work qualified. If the employee was performing qualified services during the year the option was granted, the spread is included in wages for the year it is exercised.1Internal Revenue Service. Audit Techniques Guide – Credit for Increasing Research Activities IRC 41 – Qualified Research Expenses For companies with multi-year vesting, that means holding onto records of what each option holder actually did years before exercise.
Sole Proprietors and Partners
An owner who personally performs qualified research is not shut out for lack of a W-2. Section 41(b)(2)(D)(ii) treats the earned income of a self-employed individual, as defined in Section 401(c)(2), as wages for QRE purposes.2Office of the Law Revision Counsel. 26 U.S. Code 41 – Credit for Increasing Research Activities Earned income is the net self-employment earnings attributable to the trade or business, and the same time-based allocation applies: if only part of the owner’s time is spent on qualified research, only that share of earned income counts. S corporation shareholder-employees receiving W-2 wages follow the ordinary employee rules.
The Three Categories of Qualified Services
Wages count only when the employee is performing “qualified services” as defined in IRC Section 41(b)(2)(B), which the statute divides into three activities.2Office of the Law Revision Counsel. 26 U.S. Code 41 – Credit for Increasing Research Activities
Performing the Research
This is the person with hands on the problem: the software engineer writing and testing code for a new feature, the chemist designing formulations in the lab, the mechanical engineer building and evaluating prototype components. The technical work itself.
First-Line Supervision
Direct supervision means first-line management of the people doing the research. A team lead who reviews experimental results, decides technical next steps, or redirects the testing approach qualifies. The IRS draws a sharp line here based on proximity to the daily technical work, not seniority. A VP of engineering who oversees the managers who oversee the researchers does not qualify, even with a deep technical background.1Internal Revenue Service. Audit Techniques Guide – Credit for Increasing Research Activities IRC 41 – Qualified Research Expenses
Direct Support
Direct support covers work that enables the researchers or their first-line supervisors to do their jobs. The IRS points to a machinist building parts for an experimental model, a lab worker cleaning specialized research equipment, a secretary typing reports on laboratory results, and a clerk compiling research data.1Internal Revenue Service. Audit Techniques Guide – Credit for Increasing Research Activities IRC 41 – Qualified Research Expenses
General and administrative roles are excluded, and this is where a lot of claims fall apart. Payroll staff who cut checks for scientists, accountants tracking the R&D budget, janitors doing general cleaning of a lab, and officers handling personnel or finance matters are all outside the line, even when they sit in the research department.3eCFR. 26 CFR 1.41-2 – Qualified Research Expenses The support has to be specific to the research activities, not to the business unit that houses them.
The Underlying Research Must Qualify
No matter how technical an employee’s job sounds, their wages become QREs only if the research they support satisfies the four-part test in Section 41(d). The company must be developing or improving a product, process, software, technique, formula, or invention for better function, performance, reliability, or quality. The work must rely on principles of engineering, computer science, or the physical or biological sciences. There must be genuine uncertainty at the outset about capability, method, or design. And the work must proceed through a systematic process of experimentation to resolve that uncertainty.4Internal Revenue Service. Audit Techniques Guide – Credit for Increasing Research Activities IRC 41 – Qualified Research Activities
Activities aimed at style, taste, or cosmetic changes do not qualify. Routine data collection, quality control testing of production-ready products, and research funded by another party’s grant or contract are also excluded. If the underlying research fails any part of the test, the wages tied to it are not QREs.
The 80 Percent Shortcut
Tracking every hour of every employee’s time would be a heavy lift, so the regulations offer a shortcut. Under Treasury Regulation 1.41-2(d)(2), if at least 80% of an employee’s services during the year consist of qualified services, all of that employee’s wages count as QREs.3eCFR. 26 CFR 1.41-2 – Qualified Research Expenses A developer who spends 85% of the year writing and testing new code and 15% answering support tickets is treated as 100% qualified.
Below 80%, wages must be allocated based on the actual share of time spent on qualified services. The default is total wages multiplied by the ratio of hours on qualified services to total hours worked. Another method (project-based cost accounting, for example) is permitted if the taxpayer can show it is more accurate.3eCFR. 26 CFR 1.41-2 – Qualified Research Expenses
One detail changes the math on borderline cases: the denominator is time actually spent performing services, not paid hours available. Paid holidays, vacation, and sick leave come out of the denominator.1Internal Revenue Service. Audit Techniques Guide – Credit for Increasing Research Activities IRC 41 – Qualified Research Expenses A developer who worked 1,800 hours after subtracting three weeks of leave and spent 1,400 of them on qualified research is at roughly 78%, not the lower number produced by dividing into 2,080. That adjustment can push an employee over the threshold.
What Falls Outside QRE Wages
Independent Contractors
Payments to independent contractors and outside consultants are not QRE wages. They fall into a separate category called contract research expenses, and only 65% of the amount paid counts toward the credit.1Internal Revenue Service. Audit Techniques Guide – Credit for Increasing Research Activities IRC 41 – Qualified Research Expenses Mixing 1099 payments into the wage line is a common audit finding and can put the whole claim at risk.
Work Performed Outside the United States
Research conducted outside the United States, Puerto Rico, or a U.S. possession is excluded from the definition of qualified research entirely.5Office of the Law Revision Counsel. 26 USC 41 – Credit for Increasing Research Activities Wages paid to a U.S.-based employee for the days they are physically abroad doing the work, or to a remote employee working from another country, do not qualify for that time. The test is where the work is performed, not where the employee lives or where the company is incorporated. Companies with distributed engineering teams have to separate domestic and foreign hours cleanly.
Internal-Use Software
Software developed for the company’s own internal administrative, financial, or human resources use must clear a higher bar on top of the four-part test. Treasury Regulation 1.41-4(c)(6)(vii) imposes a “high threshold of innovation test” with three elements: the software must produce a substantial, economically significant, and measurable improvement in cost, speed, or another objective metric; the company must commit substantial resources under real technical uncertainty about recovery within a reasonable period; and the software cannot be something the company could buy, lease, or license and use for the intended purpose without modifications that would themselves meet the first two elements.6eCFR. 26 CFR 1.41-4 – Qualified Research for Expenditures Paid or Incurred
Software developed for sale, lease, or license to third parties, and software embedded in a product the company sells, are not treated as internal-use software and follow the standard test. If wages relate to internal-use software that does not clear the higher bar, they are not QREs.
Documenting the Wages You Claim
The records needed to defend a wage-based QRE claim go beyond standard payroll output. Payroll registers and W-2 data establish total taxable compensation, but you also need evidence connecting those wages to specific qualifying projects and activities. Time-tracking records, project management logs, and calendar data are the usual tools for showing what share of each employee’s time went to qualified research.7Internal Revenue Service. Instructions for Form 6765 (Rev. December 2025) Good documentation describes the technical uncertainty being addressed, the alternatives evaluated, and each employee’s specific role.
For an amended return that claims or increases a research credit, the IRS requires five items at the time the refund claim is filed:
- Identify every business component (product, process, or software project) the credit relates to for the year.
- Describe the qualifying research activities performed for each business component.
- Name the individuals who performed each research activity, or provide their titles.
- Identify the information each individual sought to discover, meaning the technical uncertainty they were trying to resolve.
- Provide total qualified employee wages, supply expenses, and contract research expenses for the year.
A claim missing any of the five items is deficient. The IRS currently allows 45 days to correct a deficient claim before issuing a final determination, but that window is part of a transition policy and may not last.8Internal Revenue Service. Required Information for a Valid Research Credit Claim for Refund Building the documentation as the research happens, rather than reconstructing it at filing, is what carries a wage claim through an audit.