R&D Tax Credit Audits: What Triggers Them and How to Prepare

Key Takeaways

• The IRS designates R&D credits as a Tier 1 compliance issue — placing them among the agency’s highest-priority examination targets
• The revised Form 6765 functions as a pre-audit risk screen — Section E disclosures and Section G business component reporting give examiners detailed insight at filing, not just at examination
• Section G becomes mandatory in 2026 for most filers, requiring itemized QREs by business component for the top 80% of expenses (up to 50 components)
• The IRS’s Audit Techniques Guide confirms that contemporaneous documentation trumps after-the-fact reconstruction — starting documentation now is the single most important thing you can do to protect future credits

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The IRS is getting leaner and more targeted: Recent IRS workforce reductions have reduced the number of field examiners. But the agency is compensating by concentrating resources on high-dollar, complex issues — and the R&D credit is squarely in that category. The revised Form 6765 effectively front-loads the information IRS examiners used to request during audits. The form is now a risk-screening tool, not just a credit calculation worksheet.

Reason	What Goes Wrong	How to Prevent It
Insufficient documentation	No contemporaneous records linking activities to the four-part test. Vague project descriptions. Reliance on after-the-fact interviews and estimates rather than real-time records.	Document during the year, not at tax time. Keep project logs, design documents, and time records contemporaneously.
Failing the four-part test	Activities don’t actually meet all four requirements. Most commonly: no genuine technical uncertainty existed, or no process of experimentation was conducted (the 80% threshold wasn’t met).	Apply the four-part test rigorously to each business component before claiming it.
Funded research inclusion	Claiming credit for work funded by a client where the taxpayer doesn’t bear financial risk or retain substantial IP rights. Particularly common in construction and A&E.	Analyze every contract for the funded research exclusion before including those expenses in the credit.
Overstated wage allocations	Including wages for employees who don’t actually perform, supervise, or support qualifying research. Inflating the percentage of time allocated to R&D without records.	Time tracking by project. The IRS examines what employees actually do, not their titles.
Base amount errors	Inconsistency between credit-year QREs and base-period QREs — including new expense types in the credit year that weren’t in the base period, without adjusting the base. The IRS’s consistency requirement catches this.	Apply the same expense categorization to both credit-year and base-period calculations.
Excluded activities included	Claiming credit for activities the IRS explicitly excludes: post-production quality control, market research, aesthetic changes, foreign research, social sciences. Any excluded activity inflates the credit and undermines the entire study’s credibility.	Know the exclusions under §41(d)(4) as well as the qualifying criteria. Exclude aggressively rather than inclusively.

Quotable fact: The IRS’s Research Credit Claims Audit Techniques Guide (RCCATG) instructs examiners that claims relying “too heavily on high-level estimations” — including interviews, estimates, and judgment sampling without contemporaneous records — should be “considered for disallowance” rather than examined further. The bar is contemporaneous documentation, not after-the-fact reconstruction.

What Section G Requires (Mandatory for 2026)

Business component identification

Name or identify each business component (product, process, software, technique) that generated QREs. Report in descending order of cost until you reach 80% of total QREs or 50 components, whichever comes first. Remaining components are reported in aggregate.

QRE breakdown by component

For each reported component: wages for direct research performance, wages for direct supervision, wages for direct support, supply expenses, and contract research expenses — all broken out separately by component.

Section E risk-screening disclosures

Total number of business components, officer wages in QREs, new expense categories added, and whether acquisitions or dispositions affected the credit. These are the data points examiners use to identify claims for potential review.

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Use 2025 as your dry run: Section G is optional for tax year 2025 (processing year 2026). We strongly recommend treating 2025 as a practice year — complete Section G voluntarily to identify gaps in your data collection and project tracking before it becomes mandatory. Companies that discover in April 2027 that they can’t produce component-level QRE breakdowns for 2026 will have a serious problem. Companies that test the process now will be ready.

Your audit-ready documentation checklist:

✓	Project-level descriptions — for each business component, a written narrative covering: what you were trying to develop or improve, what technical uncertainty existed at the start, what alternatives you evaluated, and the outcome
✓	Time allocation by employee by project — the IRS examines what employees actually did, not their titles. Payroll records, project tracking tools (Jira, Asana, time logs), and calendars are the primary evidence
✓	Contemporaneous technical records — design documents, test results, engineering calculations, prototype photos, pull requests, commit histories, design review meeting notes, lab notebooks
✓	Financial records tying expenses to projects — chart of accounts detail, purchase orders for supplies used in research, contractor invoices, cloud computing cost allocation by environment
✓	Contract analysis — for each contract involving research, documentation showing the firm bore financial risk and retained substantial rights (critical for funded research analysis)
✓	Base amount calculation support — fixed-base percentage documentation, gross receipts for the four preceding tax years, and consistency analysis between credit-year and base-period expense categories

The documentation hierarchy, according to the IRS: The IRS Audit Techniques Guide states that contemporaneous records form the basis of the examination. The IRS does not have to accept estimates if actual documentation exists. Courts only allow estimation methods when contemporaneous records are unavailable — and even then, the estimation must meet specific conditions. The practical takeaway: real-time records created during the research always beat after-the-fact reconstruction.

Claiming R&D Credits? Build Them to Survive Scrutiny.

Our R&D studies are built from the IRS Audit Techniques Guide — the same playbook examiners use. If the IRS comes knocking, your documentation is already organized to answer their questions.

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Does claiming the R&D credit increase my audit risk?

Claiming the credit itself doesn’t automatically trigger an audit. The IRS uses risk-based screening — the credit amount, year-over-year changes, industry, and return-level disclosures all factor in. A properly documented credit with consistent annual claims and reasonable QRE ratios presents a normal risk profile. It’s aggressive, poorly documented claims that draw scrutiny.

What happens during an R&D credit examination?

The examiner will issue Information Document Requests (IDRs) asking for your project descriptions, time records, technical documentation, and financial substantiation. They may also interview technical personnel to understand the research process. The examination typically focuses on whether your activities meet the four-part test and whether your QRE calculations are substantiated. With proper documentation, most examinations conclude with the credit being sustained — partially or in full.

Can the IRS disallow my credit entirely?

Yes. The RCCATG instructs examiners that claims lacking adequate substantiation should be disallowed rather than examined further. Partial disallowance is also common — the IRS may sustain some business components while disallowing others. The key is having defensible documentation at the component level so that even if some activities are challenged, the qualifying portions survive.

Should I complete Section G voluntarily for 2025?

We recommend it for most clients. Treating 2025 as a dry run lets you identify gaps in your data collection and project tracking before it becomes mandatory in 2026. If you discover you can’t produce component-level QRE breakdowns now, you have a year to fix your systems. That’s much better than discovering the gap during mandatory reporting.

What if I’ve been claiming the credit without detailed documentation?

Start documenting now. You can’t go back and create contemporaneous records for prior years, but you can build the documentation framework going forward. For open tax years where you’ve already claimed the credit, work with your tax advisor to compile whatever documentation exists — project management records, email trails, design documents, engineering files. The IRS will accept reasonable contemporaneous records even if they weren’t created specifically for the R&D credit. Read our complete R&D tax credit guide for documentation best practices.