How Has the IRS Changed the R&D Tax Credit Game for 2026 Filings?

If you’re planning to claim the R&D tax credit this filing season, you need to know that the rules have fundamentally changed. The IRS has spent the past several years systematically tightening requirements around how companies document and report their research activities, and those changes are now in full effect.

Let me be direct: the days of filing a simple Form 6765 with basic calculations are over. The IRS wants details. They want narratives. They want proof that you can substantiate every dollar you’re claiming, and they want it organized at the business component level.

What Actually Changed

Back in October 2021, the IRS dropped News Release IR-2021-203, which signaled a major shift in how they’d evaluate R&D credit refund claims. They laid out specific requirements for what constitutes a “valid” claim. Fast forward to 2024, and the IRS finalized an overhaul of Form 6765 that reflects this new reality. (We covered the top changes for 2025 in detail last year.)

Here’s what companies filing in 2026 need to understand. While Section G of the new form remains optional for 2025 tax year filings (thanks to an extension announced in October 2025), Sections E and F are mandatory. And make no mistake: Section G will become mandatory for 2026 tax year filings. The IRS has been crystal clear about that. (If you want to understand exactly what Section G requires, we broke down every line of Section G in a previous post.)

What does this mean practically? You now need to provide information that goes far beyond the calculations you’re used to. The form asks you to identify your business components, describe the uncertainties you addressed, explain your process of experimentation, and allocate your qualified research expenses by category and employee role. Understanding your business component strategy is now critical to compliance.

This isn’t busywork. The IRS is using this information to assess risk and identify claims that might not hold up under scrutiny.

The June 2024 Relief

In June 2024, the IRS did throw taxpayers a small bone. They updated their refund claim FAQs and waived two requirements at the time of filing. You no longer need to provide the names of individuals who performed research activities or detail what information each person sought to discover when you submit your initial claim.

But don’t misunderstand this as the IRS going soft. They explicitly reserved the right to request this information during an examination. This is procedural relief, not substantive relief. You still need to have this information ready if they come knocking.

Why This Matters for 2026 Filings

The IRS isn’t making these changes because they love paperwork. They’re responding to what they see as a proliferation of aggressive or poorly documented R&D claims. Court cases like Harper and Premier Tech highlighted how procedural deficiencies could derail otherwise legitimate claims. The IRS learned from those cases, and they’re now building guardrails into the form itself. (Recent cases like Kyocera and Park-Ohio further underscore how documentation failures sink claims.)

Companies that treat this as a compliance checkbox are setting themselves up for problems. The new form structure demands that you think about your R&D activities differently. You need to organize your projects by business component. You need contemporaneous documentation of technical uncertainties. You need to track time at a more granular level than most companies currently do. If you’re still relying on interviews and write-ups alone, you’re not building defensible documentation.

And here’s the thing: if you wait until tax season to figure this out, you’re already behind.

What You Should Do Right Now

First, look at your 2025 documentation. Can you identify specific business components? Can you articulate the technical uncertainties you faced for each one? Can you describe your experimentation process in detail? If you’re struggling with any of these questions, you’ve got work to do.

Second, use 2025 as a pilot year. Section G is optional this year, but that doesn’t mean you should skip it. Treat this filing season as a dress rehearsal for mandatory reporting next year. Work through the new sections. Identify gaps in your documentation. Stress-test your internal processes.

Third, invest in your documentation systems now. The new requirements aren’t going away, and they’re only going to get more scrutinized. Companies need project-level tracking, contemporaneous technical notes, and clear allocation methodologies for qualified expenses. If you’re still reconstructing this information at year-end, you’re doing it wrong. Building a defensible R&D credit process requires documentation that happens in real-time, not after the fact.

The Bigger Picture

The IRS is sending a message: they want transparency, and they want it upfront. They’re tired of claims that can’t be substantiated. They’re tired of vague descriptions that could apply to any company in your industry. They want to see that you’ve done real research, faced real technical challenges, and have real documentation to back it up.

This isn’t a reason to panic, but it is a reason to take this seriously. The R&D credit remains one of the most valuable incentives available to innovative companies. But claiming it now requires a level of rigor that many companies haven’t historically maintained.

The good news? If you’re genuinely doing qualifying research and you document it properly, you’ll be fine. The companies that will struggle are the ones that viewed the R&D credit as low-hanging fruit and didn’t invest in proper substantiation.

The rules have changed. The form has changed. The IRS’s expectations have changed. Companies that adapt will continue to benefit from this valuable credit. Those that don’t will find themselves in costly and time-consuming disputes.

It’s time to get serious about R&D credit compliance. Your 2026 filing season depends on it.

Need help navigating the new Form 6765 requirements?

Our team has been helping companies strengthen their R&D credit documentation and compliance processes for the evolving IRS landscape. Let’s talk about your specific situation.

Jason Massie, CPA, Esq.

As the Founder and President of MASSIE R&D Tax Credits, Jason is responsible for the quality, consistency, and integrity of our services. His strategic vision and leadership drive innovation within the company, encouraging collaboration and ne...