Kyocera R&D Court Case: Interviews may not be enough for Section 41 Credits

The Kyocera R&D court case offers a timely warning to large companies pursuing R&D tax credits under Section 41. The case demonstrates that the IRS and courts expect contemporaneous documentation to support these complex, high-dollar claims. Without it, even well-prepared refund claims can unravel especially when they are based on after-the-fact interviews.

For corporate tax teams managing large-scale R&D claims, this case underscores an emerging reality. The IRS is sharpening its focus on documentation quality and procedural rigor. What might have passed muster a few years ago is no longer sufficient.

In this post, we will examine the Kyocera case, explore the legal precedents it reinforces, and outline best practices for ensuring that your Section 41 claims can withstand the IRS’s evolving expectations.

The Kyocera R&D Court Case: What Happened

In July 2024, the U.S. government moved for summary judgment against Kyocera AVX’s amended Section 41 refund claim. The company sought approximately $1.3 million in R&D credits for tax years 2017 through 2020. The IRS challenged the claim on two main grounds:

• Kyocera lacked contemporaneous time tracking for R&D work.
• The company relied primarily on retrospective PwC interviews rather than primary documentation.

This is a critical distinction. The IRS and the courts have consistently ruled that after-the-fact interviews, unsupported by contemporaneous records, do not constitute adequate substantiation for R&D tax credits.

In March 2025, the dispute escalated to U.S. Tax Court after Kyocera contested an additional $2.3 million deficiency assessment for its 2018 tax year.

At the heart of the case was a simple question: Did Kyocera have the right kind of documentation to support its claims under Section 41? The answer, as the IRS and prior case law made clear, was no.

Key Legal Takeaways for Tax Teams

Contemporaneous Documentation Is Required

Courts have consistently reinforced that contemporaneous documentation is required to substantiate Section 41 R&D claims. In the Kyocera R&D court case, the IRS pointed to key precedents, including Eustace v. Commissioner and the more recent Little Sandy Coal case, where courts rejected reliance on after-the-fact interviews.

Both cases stress the same principle: estimates, approximations, and reconstructions after the fact cannot replace detailed, contemporaneous records. Without systematic, real-time records, even genuine R&D activity may not qualify for the credit.

The 80 Percent Rule Must Be Documented

Another key point that surfaced in the Kyocera case is the 80 percent process of experimentation rule. To qualify R&D activities under Section 41, taxpayers must demonstrate that substantially all — at least 80 percent — of the activities constituted a process of experimentation.

Without time tracking or detailed project-level records, meeting this threshold is difficult, if not impossible. In prior cases, courts have found that companies could not rely on estimates or high-level summaries to satisfy this requirement.

If you cannot prove which projects, which activities, and which hours meet the Section 41 criteria, you will struggle to defend the credit.

The Burden of Proof Is on the Taxpayer

Perhaps the most important takeaway is this: the burden of proof lies squarely with the taxpayer. In any R&D credit audit or dispute, it is not sufficient to argue that your teams performed R&D activities. You must be able to demonstrate, with adequate documentation, that those activities qualify under Section 41.

This is especially important for amended returns, which typically receive higher levels of IRS scrutiny. If your claim is challenged, the IRS does not have to prove that it is invalid. You must prove that it is valid.

Best Practices for Defensible R&D Claims

For enterprise tax teams, the Kyocera R&D court case reinforces several best practices that should become standard operating procedure.

Implement contemporaneous time tracking
Automated systems such as Jira, GitHub, or Asana can help engineering teams log time and activity data as R&D work occurs. This data creates a contemporaneous, system-generated record that is far more defensible than retrospective estimates.

Tag activities to Section 41 criteria
Time and effort records should map clearly to qualified research components, uncertainties, and experimental processes. This requires thoughtful training and process design across engineering, finance, and tax functions.

Maintain supporting documentation
Emails, test plans, code repositories, and project design records all help substantiate that R&D work meets IRS standards. Crucially, Subject Matter Experts (SMEs) must also understand how their documentation feeds into the R&D credit process.

Monitor amended return risks
Amended R&D claims face heightened scrutiny. Ensure your documentation can withstand that level of review. If your amended returns depend heavily on retrospective interviews, they are vulnerable.

How MASSIE Helps

MASSIE helps large tax teams build more defensible, efficient, and audit-ready R&D tax credit processes.

Our team works directly with engineering, finance, and tax leaders to:

• Train SMEs and engineering teams on what qualifies for Section 41 and how to document it properly. Learn more about how to train SMEs to improve R&D tax documentation.
• Map R&D activities to Section 41 criteria and help clients align documentation with IRS expectations.
• Support optimized workflows by helping clients use the tools and data they already have (Jira, GitHub, time tracking, project systems) to generate IRS-grade documentation.
• Assist with audit preparation and amended return strategies, helping clients avoid common IRS R&D audit triggers. See our guide to optimizing your R&D tax credit process with technology.

We do not require clients to purchase new software or time tracking systems. Instead, we help you build a sustainable, defensible process that works within your existing operations.

Final Thoughts

The Kyocera R&D court case highlights a growing reality. For large companies, defending Section 41 claims requires robust, contemporaneous documentation. After-the-fact interviews and estimates are no longer sufficient.

The IRS is watching closely. Courts are setting clearer standards. Companies that invest in modern, integrated documentation processes will be prepared to defend their claims. Those that do not will face increasing risk.

By modernizing your R&D tracking and documentation now, you can avoid the risks that derailed Kyocera’s claim and preserve the full value of your R&D tax credits.

Protect your next R&D tax credit claim and schedule a consultation with the MASSIE team.

Jamie Bond

As Director of Tax Credits at MASSIE, Jamie is dedicated to setting her clients up for success by delivering supportable work and focusing on building strong client relationships to ensure the best results. With over 11 years of experience in R&am...