Micro-captive insurers: What the IRS looks for beyond eligibility

Executive summary

Evaluating captive insurance companies in a heightened enforcement environment

IRS scrutiny of section 831(b) captive insurance arrangements has recently increased under the January 2025 final micro-captive disclosure regulations. The most significant issue for taxpayers remains whether a captive operates as a bona fide insurance company for federal income tax purposes in light of its underwriting practices, premium development, claims administration, governance and investment activities.

Organizations with captive insurance companies may benefit from reviewing existing structures, documentation and reporting obligations to determine whether the captive can withstand examination of its form and day-to-day operations.

How to think about a “good” vs. “bad” captive in today’s IRS environment

Final micro-captive disclosure regulations adopted in 2025 impose additional disclosure obligations on taxpayers and material advisors seeking preferential tax treatment of micro-captive insurance transactions under section 831(b). As a result, the conversation has shifted from technical eligibility to scrutiny of how these structures actually operate. The IRS is focused less on whether a captive can qualify under section 831(b) and more on whether it functions like real insurance—or whether it looks and feels like a tax-motivated arrangement.

The regs make clear that eligibility is only the starting point. For taxpayers, the practical question is whether the captive can be supported as a real insurance arrangement in both form and operation. The IRS continues to focus on how risk is underwritten, how premiums are set, how claims are administered and whether captive funds are used for insurance purposes rather than returned to related parties.

Background: Definitions and criteria

A captive insurance company is generally an insurance company formed to insure risks of a business, its affiliates, its owners, or other identified insureds, rather than relying entirely on third-party commercial insurance. A captive can be a legitimate risk-management tool, but its tax treatment depends on whether the arrangement qualifies as insurance for federal income tax purposes and whether the captive qualifies as an insurance company.

Section 831(b) allows qualifying small non-life insurance companies, or micro-captives, to pay income tax only on investment income, rather than on underwriting income. An insurer is eligible for this treatment provided that its written premiums do not exceed an annual threshold and that it has adequate risk shifting and sharing, has sufficient capital, and is a U.S. taxpayer, domiciled either domestically or offshore with a section 953(d) election.

Section 831(c) defines “insurance company” under the meaning given by section 816(a), which generally looks to whether more than half of the company’s business during the taxable year is issuing insurance or annuity contracts or reinsuring risks underwritten by insurance companies.

Current IRS focus and disclosure rules

In enforcing section 831(b) rules, the IRS is focusing on arrangements that appear to convert deductible premium payments into tax-favored related-party capital.

The January 2025 final regulations identify certain micro-captive arrangements as reportable transactions under Reg. section 1.6011-10 or transactions of interest under Reg. section 1.6011-11. Taxpayers generally use Form 8886 to disclose reportable transactions; material advisors may have separate disclosure and list-maintenance obligations.

The IRS is effectively looking at a combination of ownership, economics, and behavior. Ownership thresholds still matter, but they are no longer the primary factor. The real pressure points are whether there is meaningful risk transfer and distribution, whether premiums reflect actuarial reality, and whether the captive operates independently from the insured business.

When considering forming an insurance company, it is important to consider the below “bad” vs “good” characteristics of the captive and the potential tax implications.

Litigation could affect details of regs, but reporting standards are still in effect

Recent litigation developments and pending appellate decisions may affect the scope and enforcement of the micro-captive disclosure rules. 

• A decision by the U.S. District Court for the Eastern District of Tennessee upholding the January 2025 regulations is being appealed to the Sixth Circuit (CIC Services LLC v. IRS, No. 3:25-cv-00146 (2026)).
  
  
• The U.S. District Court for the Southern District of Texas has upheld the transaction-of-interest regulations but vacated the listed-transaction regulations, creating uncertainty regarding portions of the reporting framework (Drake Plastics Ltd. Co. v. IRS, No. 4:25-cv-02570 (2026)). That ruling is currently on appeal as well.

Taxpayers should not view this litigation as eliminating disclosure obligations. Despite ongoing challenges to portions of the regulations, the transaction-of-interest framework remains a significant disclosure mechanism, and the IRS continues to scrutinize captive insurance arrangements that lack strong support for their insurance treatment.