If you own a construction, architecture and engineering, manufacturing, or software business, technical work alone doesn’t qualify for the R&D tax credit. Common R&D tax credit mistakes to avoid include assuming routine work qualifies and failing to connect qualifying activities to employee time and expenses. A supportable claim ties technical uncertainty, project evidence, and reported costs together.
We’ll explain how the four-part test under IRC §41 applies, where documentation and Form 6765 reporting often fall short, and what to bring to your CPA. We’ll also cover IRC §174A: domestic research costs may be deducted currently for tax years beginning after December 31, 2024, but that deduction doesn’t establish eligibility for the §41 credit.
Key Takeaways
- An industry label or technical job title alone doesn’t establish eligibility under IRC §41.
- The four-part test considers whether work had a permitted purpose, was technological in nature, addressed uncertainty, and involved experimentation. The factors apply together, not in a fixed sequence.
- Generic project descriptions, unsupported expense allocations, and reporting that doesn’t reconcile with source records can weaken a claim.
- Bring project records, employee activity details, and expense tracking to your CPA so Form 6765 reporting and Section 174A treatment can be considered alongside the technical analysis.
Common R&D Tax Credit Mistakes: Who This Guidance Applies To
Business owners in construction, architecture, engineering, manufacturing, and software may have projects worth examining under IRC §41. But eligibility depends on the specific work, not the industry or job title.
Review a project if your team developed or improved a product, process, software, or technique and faced technical questions along the way. A formal research department isn’t required for a project to merit review. A manufacturer’s production team or a contractor’s project engineers, for example, may perform work worth examining, while other activities at the same company may not qualify.
Our R&D tax credit studies pair engineering analysis with tax expertise to connect technical work to project evidence.
Who should not assume the credit applies?
Routine production, standard installation, and ordinary software maintenance shouldn’t be treated as qualifying research just because they involve technical skill. Ask what technical uncertainty the team faced and what it did to address that uncertainty. If the work followed an established method without testing alternatives, the technical nature of the task alone may not meet the test.
The activity, not the industry name, drives the eligibility analysis. General project summaries or costs that can’t be tied to specific work are gaps to discuss with your CPA before claiming the credit.
Apply the IRC §41 Four-Part Test Without Treating It as a Checklist Sequence
IRC §41 and Treasury Regulation §1.41-4 describe four requirements for qualified research activities. They apply together, not as steps that must be passed in a fixed order. The analysis focuses on work related to a specific business component, such as a product, process, or software component, and the evidence showing what the team did.
The four-part test asks whether the documented work pursued a permitted improvement, relied on technical principles, addressed uncertainty, and used experimentation to evaluate possible solutions.
What does the four-part test ask about the work?
For each activity, ask whether its purpose was to improve a business component’s function, performance, reliability, or quality; whether it relied on engineering, computer science, or another qualifying technical field; whether the team faced uncertainty about capability, method, or design; and whether it evaluated alternatives through experimentation. Consider the factors together. A broad project label won’t explain how the work fits the test.
Why can technical work still fail to qualify?
Technical complexity isn’t enough. A demanding installation or sophisticated software task may be routine if the team already knew how to do it and didn’t test alternatives to resolve technical uncertainty. That distinction helps keep a claim focused on the work that may qualify.
Hypothetical 2026 example: A manufacturer assigns 30 hours to develop a new production process. Engineers document uncertainty about whether the process can meet a performance goal, compare alternative designs, and record test results. Those facts support an eligibility analysis, but they don’t determine its outcome. If the team instead applies a known process without evaluating alternatives, the technical nature of the work alone may not satisfy the test.
Keep relevant project notes and test records together so the activity can be understood in context. For filing information, consult the IRS’s Form 6765, Credit for Increasing Research Activities. Completing Form 6765 is separate from establishing that the underlying work meets IRC §41.
Common R&D Tax Credit Mistakes to Avoid
These are recurring weak points to look for before filing:
- Treating every technical task as research. Separate work that addressed technical uncertainty from routine production, installation, maintenance, or other work using established methods.
- Describing projects too broadly. Replace labels such as “product development” with a clear account of the business component, the technical question, and the alternatives the team evaluated.
- Allocating costs without activity support. Employee time and other claimed expenses should connect to the work being analyzed, not just to a department or project name.
- Reporting amounts that don’t reconcile. Compare the supporting schedules and source records with the information reported on Form 6765.
Prevent Documentation, Expense, and Form 6765 Errors
A supportable claim connects each reported expense to a specific business component and the work performed on it. Use a traceable process:
- Identify the business component. Name the product, process, software, or other component involved.
- Describe the activities. Record what work was done, who performed it, and when.
- Support the costs. Tie employee time and other claimed expenses to the documented activities.
- Reconcile the reporting. Compare the supporting schedules with the amounts and information reported on Form 6765.
Build a traceable record from activity to expense
Keep project notes, time entries, and payroll records that show what employees did and which business component their work related to. Records created as the work happens and linked to specific projects make it easier to connect reported costs to the activities under review.
Hypothetical 2026 example: An architecture and engineering firm tracks an employee’s work on a building-system design. Project logs identify design tasks and dates, time records assign hours to the project, and payroll records support the related wages. If only part of the employee’s time is included, records should explain which work relates to the activities being analyzed. This example illustrates how to reconcile records, not a credit outcome.
Separate the credit review from Section 174A deductions
Form 6765 reports the Section 41 credit, while IRC §174A addresses domestic research cost deductions. For tax years beginning after December 31, 2024, domestic research costs may be deducted currently under §174A, but that treatment doesn’t establish eligibility for the §41 credit. Small businesses may have retroactive options related to prior domestic research costs. Confirm with your CPA how §174A applies to the relevant tax year and whether any options may apply.
Ask your CPA how the business will support the activities and expenses reported on Form 6765, and how the technical findings should be reflected in the return.
Coordinate an R&D Tax Credit Review With Your CPA and Engineering Team
A useful review brings technical analysis and tax-return decisions together without blurring their roles. An engineering team can examine how project work was performed and connect technical explanations to available evidence. Your CPA remains central to return decisions, including how IRC §174A applies to domestic research costs.
Our R&D tax credit engineering guide explains how technical and tax professionals can coordinate. A shared review can help address weak project descriptions and expenses that lack a clear connection to the activities.
What to assemble before a technical review
Gather project descriptions, design notes, test results, specifications, employee activity information, and expense details. Include records showing who worked on each project, what they did, and when. If records are incomplete, identify the gaps rather than filling them with assumptions. The purpose is to clarify the work and evidence, not to guarantee that an activity qualifies.
During an R&D tax credit study, engineering analysis can help translate technical work into project-level explanations for your CPA to consider alongside cost and tax records.
Keep the CPA-client relationship at the center
Your CPA should lead tax-return decisions and determine how technical findings fit the company’s filing position. We work as an engineering and tax partner, supporting that relationship by examining project activities and the evidence behind them. Share project descriptions and supporting records with your CPA and technical team, then identify questions together, especially where activity categories, cost allocations, or documentation need clarification.
Make Your Next Claim Discussion More Useful
Before your next filing conversation, choose one project that raises questions and gather the records that explain the work. That gives your CPA and technical reviewers a concrete starting point: what the evidence supports, and where further detail may be needed. Common R&D tax credit mistakes are easier to address when technical facts and tax decisions are considered together, without assuming that every project or expense qualifies.
Engineered Tax Services pairs licensed engineers with tax professionals for R&D tax credit studies nationwide. We support your CPA-client relationship with technical analysis, not by replacing your CPA’s judgment on the return.
Frequently Asked Questions
Can a small business claim the R&D tax credit?
Yes. A small business may claim the federal credit if its activities and expenses meet IRC §41 requirements. A dedicated research department isn’t required. For example, a small manufacturer could review a specific product-development project, while routine production work may not qualify. Ask your CPA whether the company’s activities meet the requirements and whether it may qualify for a payroll tax offset.
Can software development qualify for the R&D tax credit?
Yes, some software development activities may qualify under IRC §41, depending on the work performed. Developing or improving software may involve technical uncertainty and testing alternatives, while routine maintenance or configuration using established methods may not meet the test. Identify the software component and the technical work performed. Your CPA can help assess how employee activities and related expenses should be treated for the claim.
Can a business claim an R&D tax credit for a prior tax year?
Possibly. A business may be able to amend a prior-year return to claim the credit, subject to applicable filing deadlines and documentation requirements. Records need to support the activities and expenses for that specific tax year, rather than relying only on current project information. Ask your CPA whether the filing period remains open and what records are available to support a prior-year claim.
Can a company claim the R&D tax credit if it has no taxable income?
Potentially. Having no taxable income doesn’t by itself rule out a claim, but it can affect how the credit is used. An unused general business credit may be carried to another tax year under applicable rules. Some qualified small businesses may also be eligible to apply a credit against payroll taxes. Ask your CPA which provisions fit the company’s circumstances and what filing requirements apply.
Is the R&D tax credit the same as the Section 174A deduction?
No. They’re separate tax provisions with different purposes. The IRC §41 credit is a credit, while IRC §174A concerns the deduction treatment of research costs. The same project may need to be considered under both provisions, but meeting the rules for one doesn’t establish that it meets the rules for the other. Ask your CPA to distinguish the two treatments in the company’s tax analysis.
If you’d like to discuss whether an engineering review could support your R&D credit analysis, start a conversation with our team and your CPA.
Disclaimer
This article is general information, not tax or legal advice. Tax rules change, and how they apply depends on your specific facts. Talk with your CPA or tax advisor before acting on anything here.
