Micro-Captive Insurance Audits: Where the IRS Wins and Loses
For better or worse, the IRS has not lost a micro-captive insurance case on the merits to date. It has lost, though, on other grounds. The case law gives a business owner facing a micro-captive insurance audit a roadmap to where the defense lives: in how the arrangement was built and run, and in the reporting rules, where the government’s footing is weaker than its Tax Court record suggests.
The Merits Record
The string of government wins runs from Avrahami (2017) through Syzygy Insurance Co. (2019), Caylor Land & Development (2021), and Reserve Mechanical in the Tenth Circuit (2022), then Keating, Swift, and Patel in 2024. The Fifth Circuit affirmed Swift in July 2025. It held that 199 insured physicians was “a couple orders of magnitude” too few to distribute risk, and that reinsurance pools cycling roughly 95 to 99.6 percent of premiums back around weren’t insurance in the commonly accepted sense.
Then the Tax Court raised the stakes. In Patel v. Commissioner, 165 T.C. No. 10 (Nov. 12, 2025), a unanimous division held that the captive arrangement lacked economic substance under section 7701(o) and imposed the 40 percent penalty under section 6662(i) for inadequate disclosure. It’s the court’s first ruling on what adequate disclosure means for that penalty.
Pools and Fronting Arrangements
Many of these structures meet the risk-distribution test on paper by routing premiums through a risk pool or a fronting carrier and taking back a share of unrelated risk. Syzygy is the template case. Courts ask whether the pool priced premiums at arm’s length, whether it paid claims, and whether the money left the owner’s economic control. When a pool returns nearly everything a participant put in, the court treats it as a round trip. The premium goes out the front door and comes back through the side window.
The Reporting Fight
Final regulations, T.D. 10029 (Jan. 14, 2025), sort micro-captives into two groups. A listed transaction requires a financing factor, such as a loan of captive funds back to the insured, plus a loss ratio under 30 percent over a ten-year computation period. A transaction of interest needs only a loss ratio under 60 percent. Both require a section 831(b) election, 20 percent related ownership, and related-party premiums.
The courts, however, have split on those rules. CIC Services, LLC v. IRS (E.D. Tenn. Mar. 5, 2026) upheld them in full. Drake Plastics Ltd. Co. v. IRS (S.D. Tex. Apr. 15, 2026) upheld the transaction-of-interest rule but vacated the listed-transaction rule as arbitrary and capricious, and the taxpayers have appealed the transaction-of-interest ruling to the Fifth Circuit. CIC Services itself won an earlier round in 2022, when a court declared Notice 2016-66 unlawful. The Form 8886 disclosure for transactions of interest still applies generally, though, and the section 6707A penalty for failing to file it is steep.
What Holds Up?
An arrangement that operates like an insurance company. What are characteristics that the IRS and courts look to? An independent actuary sets premiums before the policy year. Policies cover risks the business genuinely faces, at prices a commercial carrier would charge. Claims get filed and paid. Capital stays in the captive instead of returning to the owner through loans, which is the financing factor that turns a transaction of interest into a listed transaction. And the section 831(b) election, the ownership test, and the disclosure are handled correctly.
Owners whose captive doesn’t square with the case law should take note of the lay of the land. The IRS’s 2019 and 2020 settlement initiatives have closed, and it has not announced a new one. Winding the captive down and stopping future deductions can limit exposure for later years. Even where the deduction is lost, the exam defense can still contest penalties, disclosure, and the statute of limitations. Micro-captive cases also skip LB&I’s graduated IDR enforcement and go straight to summons, so counsel should be in place before the first document request arrives. And taxpayers looking to take the IRS on should look to new angles and novel arguments that may not fit the mold of cases to to date. Our micro-captive litigation practice and earlier analysis of the post-Avrahami cases cover the doctrine in more depth.
