The Regulatory Framework of Section 41

The regular research credit and alternative simplified credit use different historical baselines. Neither rate generally applies to every dollar of current research spending.

Qualified research expenses (QREs) can include employee wages for qualified services, eligible supplies, qualifying computer rental or lease expenses, and generally 65% of qualifying contract research payments. Cloud-related charges require analysis of the actual arrangement; ordinary hosting is not automatically eligible. Qualified services include conducting research and directly supervising or directly supporting it. General management and administrative work do not qualify merely because they benefit an R&D department.

The Four-Part Statutory Test for Qualified Research

• Research expenditure requirement: Expenditures must meet the applicable research or experimental expenditure standard. Current Section 41 refers to domestic research under Section 174A; earlier tax years require the law applicable to those years. The work must address uncertainty about capability, method, or appropriate design.
• Technological information: The research must rely on principles of physical or biological science, engineering, or computer science.
• Business component and permitted purpose: The information must be intended to help develop or improve a business component’s function, performance, reliability, or quality.
• Process of experimentation: Substantially all relevant research activities must constitute elements of a process that evaluates alternatives to resolve technical uncertainty.

Complexity, commercial success, and a new product label do not independently establish eligibility. Statutory exclusions must also be considered.

Substantiation: Connecting Activities and Expenses

Contemporaneous records generally make a claim easier to substantiate, but the source’s categorical assertion that courts have rejected all after-the-fact reconstruction is too broad. A taxpayer needs evidence sufficient to establish entitlement and quantify eligible expenses. The adequacy of that evidence depends on its reliability and the facts.

The Role of Interview-Based Studies

Interviews can explain technical work and help interpret existing records. Their value is stronger when supported by design documents, test results, source-control history, accounting records, and personnel evidence. Unsupported departmental percentages are vulnerable because they may combine experimentation with routine development and administration. An advisor’s reputation does not substitute for a factual basis.

Estimation principles associated with Cohan do not establish that qualifying research occurred. A taxpayer must first supply a credible evidentiary foundation. Neither a general rejection of testimony nor a promise that reasonable estimates will always be accepted accurately describes the law.

The Nexus Between Activities and Expenses

A defensible study explains how claimed costs relate to eligible work. Project accounting can help, but a particular timekeeping system is not a universal statutory prerequisite.

• Project approach: Job codes can connect payroll and other costs to specific business components, provided the codes distinguish eligible work.
• Cost-center approach: Departmental records need a supported allocation between qualified services and other activities.
• Hybrid approach: Combining accounting records with technical evidence or a properly designed sampling method may be useful. The method must fit the population and support the resulting amounts.

Understanding the Two Substantially All Rules

The employee wage rule and the business-component experimentation rule both use an 80% threshold, but answer different questions. They should not be treated as interchangeable.

The 80% Rule for Wage Allocations

Under Treasury Regulation Section 1.41-2(d)(2), all of an employee’s wages may be treated as qualified wages when at least 80% of the employee’s services during the tax year are qualified services. Below that threshold, the supported qualified portion may still be eligible. Failure to reach 80% does not automatically disallow every dollar of the employee’s wages.

Executive compensation requires the same connection to qualified services. Product-development responsibility, job title, or a general supervisory role does not establish the percentage of time spent on research, direct supervision, or direct support. A reasonable allocation should distinguish these services from commercial, financial, and administrative duties.

The Process of Experimentation Fraction

The business-component test asks whether at least 80% of the relevant research activities constitute elements of experimentation, measured by cost or another consistently applied reasonable basis. It is not a test of whether 80% of the finished product is new.

In Little Sandy Coal Co. v. Commissioner, 62 F.4th 287 (7th Cir. 2023), the Seventh Circuit affirmed the denial of shipbuilding research credits because the taxpayer did not supply a principled basis for quantifying experimentation. The court rejected a categorical exclusion of direct supervision and support from the experimentation analysis. Such activities require a demonstrated relationship to experimentation; including a cost in QREs does not automatically establish the experimentation fraction.

Case Study: Engineering Design and Experimentation

Phoenix Design Group, Inc. v. Commissioner, T.C. Memo. 2024-113, filed December 23, 2024, concerns an engineering firm’s research credit claims. The source identifies mechanical, electrical, plumbing, and fire-protection projects as examples of the dispute. Its project-specific characterizations should not be treated as independently verified quotations or separate judicial holdings.

Distinguishing Technical Work from Qualifying Research

Engineering calculations, code compliance, and design changes can occur without a qualifying process of experimentation. Conversely, using established scientific principles does not itself disqualify work. The relevant inquiry is what technical uncertainty existed and how alternatives were evaluated.

A staged or linear project-management process is not an automatic disqualifier. Nor does every qualifying activity require a laboratory-style written hypothesis. The taxpayer must establish an evaluative process directed at technical uncertainty, rather than infer qualification from repeated revisions alone.

The Shrink-Back Rule in Practice

If a business component does not satisfy the research tests, the regulations allow progressively smaller subsets to be evaluated until a qualifying subset is reached or the most basic element is reached. For a building-system design, a distinct subsystem may merit separate examination. Shrink-back does not cure missing evidence or override other exclusions.

Software Development and Section 41

Software eligibility depends on the work performed and its intended use. Software developed for sale, lease, or license still must satisfy the research requirements and applicable exclusions. Routine maintenance, cosmetic changes, and ordinary implementation are not qualified research simply because programmers perform them.

Internal-Use Software and the Heightened Test

Software developed primarily for general and administrative functions may be internal-use software. Subject to regulatory exceptions, it must meet the ordinary research tests and a high threshold of innovation: an economically significant improvement, significant economic risk arising from technical uncertainty, and lack of a commercially available solution usable without modifications meeting the innovation and risk requirements.

Software enabling interactions with third parties and dual-function software require separate classification analysis. Internal use is not synonymous with every application used by employees.

The source’s claim that information must be new to the industry is incorrect under the modern regulations. Using existing computer science principles can qualify when the taxpayer establishes the required uncertainty and experimentation.

Potential Research Activities Across the Software Lifecycle

Latency, authentication, machine learning, and security projects require this same factual analysis. Their subject matter does not create automatic eligibility.

The Funded Research Exclusion

Research funded by another person may be excluded under Section 41(d)(4)(H). Contract labels alone do not resolve the issue.

Financial Risk and Substantial Rights

Examine whether payment depends on successful research and whether the researcher retains substantial rights. Retained rights need not be exclusive ownership. Where payment is not contingent on success, funding can reduce otherwise eligible expenses; where substantial rights are absent, the exclusion can apply more broadly. Contract terms, payment amounts, and the applicable regulations must be considered together.

The Role of Governing Law and Procedural Posture

In System Technologies, Inc. v. Commissioner, Docket No. 12211-21, the January 3, 2025 order denied the Commissioner’s motion for partial summary judgment. The court considered Indiana commercial law and the customer’s remedies. This was not a final allowance of all claimed credits, and it does not establish that every contractual refund remedy makes research unfunded.

The source also describes Smith as a taxpayer victory in 2025. That description is incomplete in light of Smith v. Commissioner, T.C. Memo. 2026-50, filed June 16, 2026. In that later opinion, payments under the six sample contracts were not contingent on successful research. Substantial rights were retained for four projects but not two, affecting the extent of the funded-research exclusion. The result underscores the need to distinguish procedural rulings from subsequent merits decisions and to examine each contract individually.

Sections 174 and 174A: Research Expense Treatment

The source’s suggestion that domestic five-year amortization remains universally mandatory is outdated. For tax years beginning in 2022 through 2024, the TCJA generally required five-year amortization of domestic research expenditures and fifteen-year amortization of foreign research expenditures.

Legislation enacted July 4, 2025 introduced Section 174A, generally restoring immediate deductions for domestic research or experimental expenditures for tax years beginning after December 31, 2024. Foreign research remains subject to fifteen-year amortization under Section 174. Elections and transition rules address capitalization and remaining domestic balances; applicable deadlines and procedures must be checked before making an election.

The research expenditure deduction and research credit have different scopes. Deductibility alone does not establish credit eligibility. Section 280C coordination also affects the deduction or credit amount. Revenue Procedure 2025-28 provides implementation guidance for the 2025 changes.

Eligible qualified small businesses may elect up to $500,000 of research credit against specified employer payroll taxes, subject to the statutory limits and election requirements. This is not an automatic payment available to every startup.

IRS Procedures and Form 6765

Changes to Form 6765

The revised form includes Section E for other information, Section F for the QRE summary, and Section G for business-component information. Section G is optional for tax year 2025. Under the IRS’s announced timetable, it becomes mandatory for tax year 2026, subject to exceptions and the applicable instructions. It does not universally require the same detailed disclosure for every project.

Amended Returns and Refund Claims

For research credit refund claims postmarked from June 18, 2024, the IRS generally requires identification of the relevant business components, the research activities for each, and total qualified wage, supply, and contract research expenses. The earlier requirements to identify each individual and what each sought to discover are waived at filing, although additional evidence may be requested during examination.

The transition period through January 10, 2027 allows an opportunity to perfect a deficient claim, generally within 45 days after an IRS request. It does not extend the statutory deadline for filing a refund claim. Claim sufficiency and substantive entitlement remain separate questions.

R&D Services and Supporting Technology

The source’s market growth projections and firm rankings are not supported sufficiently to retain as factual conclusions. Businesses can instead compare providers by relevant experience, the proposed substantiation method, and support during examination.