Audio Technica U.S., Inc. manufactures high-end audio equipment. It claimed R&D tax credits for multiple tax years, presented over 6,000 pages of documentation at trial, convinced a unanimous jury that its research qualified and still ended up back in court fighting over a number it thought the IRS had already agreed to.
The lesson here is not about whether the research is qualified. The jury settled that. This case is a single calculation that can quietly determine the size of your R&D credit and what happens when your settlement agreement leaves it unwritten.
To claim the R&D tax credit under Section 41, a company must show that its current research expenses exceed a baseline amount. That baseline is calculated by multiplying the company’s average annual gross receipts by what is called the fixed-base percentage.
The fixed-base percentage is derived from a company’s qualified research expenses during a historical “base period” specifically; tax years 1984 through 1988 divided by gross receipts for those same years. The lower the fixed-base percentage, the lower the baseline, and the larger the credit.
For Audio Technica, the fixed-base percentage in question was 0.92%. A small number. An enormous consequence.
Audio Technica has been through R&D credit disputes before. For tax years 2002 through 2005, and again for 2011, the IRS challenged its credits. Both times, the parties settled without going to trial, and the Tax Court approved those settlements.
Here is where the problem began.
Audio Technica believed the 0.92% fixed-base percentage had been agreed upon as part of those settlements that IRS attorneys and Audio Technica had worked through the math together and arrived at the final dollar amounts using that rate. But the actual settlement documents listed only total dollar figures. The 0.92% rate was never written into the court records.
For tax years 2006 through 2010, the IRS challenged the credits again, and this time disputed the 0.92% fixed-base percentage directly. Audio Technica paid the deficiency and sued for a refund in federal district court, arguing that the IRS was judicially estopped from challenging the rate. In plain terms: you already agreed to this number; you cannot walk it back now.
The district court agreed. The case went to trial. The jury returned a unanimous verdict in Audio Technica’s favor on the question of qualified research activities. The district court used the 0.92% rate to calculate the credit owed.
Then the Sixth Circuit reversed.
The Sixth Circuit Court of Appeals ruled that judicial estoppel did not apply because the Tax Court had never actually accepted the 0.92% fixed-base percentage as part of those prior settlements.
The prior agreements listed dollar amounts. Nothing more. Whatever calculations the parties used to arrive at those figures happened behind the scenes, outside the record. The Tax Court, when approving the settlements, had no visibility into the 0.92% rate and made no ruling on it.
A settlement that the court approves but does not examine is not the same as a position the court has adopted. And judicial estoppel only prevents a party from contradicting a position that a prior court accepted not one that was quietly implied in an off-the-record calculation.
The Sixth Circuit sent the case back to determine the correct fixed-base percentage through proper evidence, placing the full burden of proof back on Audio Technica to document its qualifying research expenses from 1984 to 1988, decades earlier.
Lesson | What Happened in the Case | What You Should Do |
What is implied in a settlement is not what is agreed | Audio Technica and IRS attorneys both used 0.92% to calculate the settlement figures. Because it was never written into the court’s documents, the IRS was free to challenge it years later. | Always write every agreed rate, percentage, and formula explicitly into settlement documents. What is off the record is not binding. |
The fixed-base percentage compounds across every future year | A disputed fixed-base percentage does not affect just one year. It resets the calculation for every subsequent year you claim the credit. The stakes rise with every filing. | Treat your fixed-base percentage as a permanent, high-stakes figure. Document it thoroughly and review it before every claim. |
Winning qualified research does not automatically win the credit | Audio Technica proved its research qualified. The jury agreed. But the credit amount still could not be finalized without a confirmed fixed-base percentage. | Substantiation of activities and accuracy of the credit calculation are two separate burdens. You must meet both. |
The Audio Technica case is a reminder that R&D tax credit claims require precision at every level not just in identifying qualified activities, but in calculating and documenting every input that determines the final credit figure.
TaxDrone.AI was developed by National Tax Group (NTG), combining decades of tax expertise with cutting-edge AI. NTG’s specialists understand that the fixed-base percentage, base period documentation, and settlement language are not administrative details; they are the foundation on which every future credit stands. TaxDrone.AI builds audit-ready documentation that captures both the activity and the math, ensuring that what you claim is exactly what you can defend.
What the settlement documents leave out, the IRS will fill in on its own terms.
See TaxDrone.AI in Action. Get Your R&D Credit Today.
