Micro-Captive Insurance: Where the Tax Saving Turns Risky
How a small captive insurance company taxed only on investment income can shelter premiums, why the IRS has listed many of them as abusive, and what separates a legitimate captive from a tax shelter.
Reviewed by the Fairlight Accounting cross-border tax team — U.S. & Canadian Tax Desks
A micro-captive is an insurance company, owned by a business owner, that insures that owner's business and elects under Section 831(b) to be taxed only on investment income. The business deducts the premiums. Insuring real risks at real prices is legal; a captive that exists only to shelter premiums is what the IRS lists as abusive.
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How is it supposed to work?
| Step | Legitimate version |
|---|---|
| Form a captive insurance company | Licensed in a state or foreign domicile with real capital |
| Identify risks the business cannot insure well commercially | Deductibles, business interruption gaps, cyber, supply chain, reputational risk |
| Price the coverage | Actuarially, comparable to commercial rates |
| Pay premiums | Deductible to the business, within the annual premium limit for the election ($2.9 million for 2026, indexed for inflation) |
| Pool risk | Enough unrelated risk, or a pool arrangement, that the captive is insuring rather than just saving |
| Pay claims | Real claims process; reserves that reflect loss experience |
| Distribute surplus | Eventually, as dividends taxed to the owner |
Why does the IRS object?
Because many captives were sold as tax products: premiums set to hit the limit rather than to price risk, coverage for implausible events, loss ratios near zero year after year, pooling arrangements that returned the money, and captive assets loaned back to the owner. Regulations finalized in January 2025 (T.D. 10029) designate as listed transactions micro-captives that both financed or otherwise conveyed premium dollars back to the insured or related parties and had losses and claim expenses below 30 percent of premiums over the last ten years; a captive with either related-party financing or a loss ratio below 60 percent is a transaction of interest. Both must be disclosed on Form 8886, with penalties for failing to file. The Tax Court has disallowed premium deductions in a series of cases since 2017 where the arrangements lacked risk distribution or were not insurance in the commonly accepted sense.
What does the taxpayer face if the captive fails?
Disallowed premium deductions for every open year, the captive's income taxed, accuracy or economic-substance penalties, disclosure penalties for listed transactions, and interest. Promoter fees are sunk.
Is there a legitimate use?
Yes, for a business with real uninsured exposures, enough scale to justify the cost of running an insurance company, and the willingness to accept that claims will be paid. The decision should be driven by risk management, with tax as a byproduct — the reverse of how most micro-captives were sold.
Frequently asked questions
What is the premium limit for the election?
$2.9 million of net (or, if greater, direct) written premiums for 2026, up from $2.85 million for 2025 and indexed annually; captives above it are taxed as ordinary insurance companies.
Do I have to disclose a captive on my return?
If it fits the listed transaction or transaction of interest definitions, the insured business and the captive must each file Form 8886 (an owner can generally rely on the business's filing under a regulatory safe harbor), and advisers must report as material advisors on Form 8918.
Can an existing captive be unwound?
Yes. The IRS has offered settlement initiatives in the past, and a captive can be liquidated, with the tax consequences of the distributions.
Is a captive the same as self-insurance?
No. Self-insurance reserves are not deductible; a captive's premiums are deductible only because it is a separate insurer with risk transfer and distribution.
Official sources
The IRS explains: “This document contains final regulations that identify transactions that are the same as, or substantially similar to, certain micro-captive transactions as listed transactions, a type of reportable transaction, and certain other micro-captive transactions as transactions of interest, another type of reportable transaction.” — Internal Revenue Service, Internal Revenue Bulletin: 2025-09, https://www.irs.gov/irb/2025-09_IRB
The statute provides: “In lieu of the tax otherwise applicable under subsection (a), there is hereby imposed for each taxable year on the income of every insurance company to which this subsection applies a tax computed by multiplying the taxable investment income of such company for such taxable year by the rates provided in section 11(b).” — Legal Information Institute, Cornell Law School, 26 U.S. Code § 831 - Tax on insurance companies other than life insurance companies, https://www.law.cornell.edu/uscode/text/26/831
Next step
Fairlight Accounting handles U.S. domestic, cross-border (U.S.–Canada), and international tax returns, plus bookkeeping, payroll, and CFO advisory. Our U.S. Tax Desk reviews proposed captive arrangements against the listed transaction criteria before a client signs with a promoter. See pricing or book a free fit call.
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