Tax Court Doubles Penalties on Micro-Captives
Micro-captive insurance arrangements have long been on the IRS "dirty dozen" list of potentially abusive arrangements worthy of increased scrutiny.More recently, they've been identified as listed transactions—triggering increased disclosure and reporting obligations.In a case decided earlier this year, the IRS doubled down—not only challenging the allowability of the federal income tax deduction related to the captive arrangement, but also pursuing enhanced 40% economic substance penalties under IRC Section 6662.The case, Kadau v. Commissioner (or Kadau II), T.C. Memo. 2026‑37 (2026), should serve as a warning for taxpayers funding insurance via captive structures.The Tax Court was very clear: when captive insurance premiums greatly exceed commercial premium rates for similar coverage, deductions will not only be disallowed—enhanced accuracy-related penalties will apply.
Kadau v. Commissioner: The Captive Insurance Deductions
Curtis Kadau operated a metal alloy production and sale company (Surface Engineering). He was the sole shareholder and president.In 2012, Kadau consulted RMC, a company engaged in promoting micro-captive insurance arrangements.Their actuary recommended $1.2 million annual premium funding for various lines of coverage and formed a captive insurance company (Risk & Asset Protection Services) in Nevis, electing treatment under IRC Section 831(b).
Premiums were transferred from Surface Engineering (via RMC) to Risk & Asset.Risk & Asset invested more than half of their funds in a $6 million life insurance policy covering Kadau's life.Premiums were paid via annuity withdrawals (the annuity was Risk & Asset's sole asset aside from the life insurance policy).
In 2025, the Tax Court held in Kadau I, T.C. Memo. 2025-81 that Surface Engineering's premium payments were not for insurance in the common accepted sense and that the policies did not have a legitimate non-tax business purpose, denying the company's federal tax deduction.Notably, the premiums were 2.5% to 3% higher than premiums for similar commercial coverage.They also found that the RMC actuary prepared their quote in a single day without receiving any information about Surface Engineering's business.
The IRS issued two separate notices of tax deficiency: one for 2012-2025 and another for 2016 and 2017.The court imposed a 20% accuracy penalty and reserved the question of whether to apply the IRS-sought 40% penalty.
Kadau II & The Economic Substance Doctrine
The issue in Kadau II was whether the micro-captive transaction lacked economic substance.Transactions that lack economic substance are subject to a 20% penalty if the lack of economic substance is the reason that the sought-after tax benefit was disallowed.
The penalty increases to 40% if the underpayments are attributable to nondisclosed noneconomic substance transactions under IRC Section 6662(i).The penalty increases if the transaction (1) lacked economic substance and (2) was not adequately disclosed in the taxpayer's return.
The Tax Court applied a two-part test to determine whether the micro-captive transaction lacked economic substance.The first prong is objective, considering whether the transaction changes the taxpayer's economic position in a meaningful way.The court noted that Risk & Asset did not receive any insurance claims during the first four years at issue (2012-2015). Claims were filed in 2016 and 2017—and Kadau personally assessed all three claims and, without input from an independent adjuster, granted all claims.The court emphasized the circular nature of the transactions, finding that Kadau never lost control of his money.
The second prong is subjective, considering whether the taxpayer had a substantial non-tax purpose for the transaction.On this prong, the court rejected Kadau's argument that he formed the captive to reduce insurance premium costs.The insurance premiums paid to the captive were actually higher than commercial premiums—leading to a finding that Kadau paid higher premiums only to increase associated federal tax deductions.
The court also found that investing most of the micro-captive funds in a life insurance policy on Kadau indicated that the transaction lacked a legitimate non-tax purpose and was merely a "shell" for Kadau's estate planning.
The court then found that the transactions were not adequately disclosed, justifying imposition of the higher 40% penalty.The connection between the parties was not disclosed in any return between 2012-2015 and none included the relevant Form 8275 disclosure statement to identify the micro-captive arrangement.
Conclusion
The IRS' continuing scrutiny of micro-captive arrangements illustrates the need for strong documentation at every turn.Taxpayers engaging in micro-captive transactions should be prepared to support the economic significance and business purpose of the arrangement as a whole in the face of enhanced scrutiny.