R&D Tax Credit Documentation: What the IRS Actually Wants

Why documentation is the whole game

The R&D credit is generous, and generous tax breaks get scrutinized. Qualifying for the credit is only half the job. Proving it is the other half, and it is the half most businesses underestimate. In the 2026 case George v. Commissioner, the Tax Court agreed that a poultry producer's research qualified, then disallowed three of seven projects and cut the credit rate from 14 percent to 6 percent, all because the records could not back up the claim.

The four things to keep

• Project records: the technical problem, what you were unsure about, what you tried, and what happened.
• Payroll records: who worked on the qualifying activity and roughly how much of their time it took.
• Financial records: invoices for supplies and the agreements behind any contracted research.
• Technical narratives: a short write-up tying each project to the four-part test.

Written-as-you-go beats reconstructed

There is a question that decides a lot of audits: which came first, the research or the study? When a credit study is assembled years after the fact to justify a number, it tends to have exactly the gaps the IRS looks for. Notes written while the work is happening carry weight because they show the uncertainty was real and the experimentation actually took place.

The 2026 Form 6765 change raises the bar

Starting with tax year 2026 returns, generally filed in 2027, the IRS requires business-component detail in the new Section G of Form 6765. For 2024 and 2025 returns the section is optional, after the IRS delayed the requirement. Two groups stay exempt even once it is mandatory: qualified small businesses electing the payroll offset, and filers with no more than $1.5 million in qualified research expenses and $50 million in gross receipts who claim the credit on an original return. The direction is clear either way: the IRS wants the work shown at the project level, which makes good records even more valuable.

A documentation system for a busy operation

1. Write down the question before you start. What were you trying to figure out, and why were you unsure?
2. Log what you changed and what you held constant, so the experiment is clear later.
3. Save invoices and time records as you go, instead of hunting for them at year-end.
4. Write a short narrative per project while it is fresh, tying it to the four-part test.

Frequently asked questions

Is contemporaneous documentation required by law?

It is not strictly mandatory, but courts weigh it heavily, and it is the difference between a claim that holds up and one that does not. Records made during the work are far more credible than a reconstruction.

Can I still claim past years without perfect records?

Often yes, but the claim is only as strong as what you can substantiate. The thinner the records, the more of the credit is at risk if the return is examined.

What is the new Form 6765 Section G?

It is a section that asks for business-component-level detail, required for most filers beginning with 2026 filings. Qualified small businesses electing the payroll offset are exempt from it.

What single thing helps most?

Writing down the technical uncertainty before the project starts. It proves there was a real question to resolve, which is the part claims most often fail on.