How captives are taxed: premiums, 831(b), excise tax and distributions

A captive is taxed like any other U.S. insurance company unless it qualifies for the small-company election in section 831(b) of the Internal Revenue Code. The business that pays it gets a deduction only if the arrangement is insurance for federal tax purposes, which is the question the IRS and the courts keep asking. For 2026 the 831(b) election is open to a captive whose premiums do not exceed $2,900,000 (IRS Rev. Proc. 2025-32).

This is general information, not tax advice. Captive tax positions turn on facts, and a CPA or tax attorney who handles captive examinations should sign off before you form or join one.

The two tax questions

Every captive has two sets of tax consequences, and they are tested separately.

1. The insured's deduction. The operating company deducts premium as an ordinary business expense under section 162, but only if the payment is for insurance. If the IRS says it is not, the deduction is disallowed and the payment looks like a transfer to an affiliate or owner.
2. The captive's own tax. The captive is a corporation. It is taxed on underwriting and investment income under the insurance company rules of subchapter L, or, if it elects and qualifies under section 831(b), only on investment income.

Most of the controversy sits in the first question. The second is mostly arithmetic once the first is settled.

When premium counts as insurance

Courts look for risk shifting, risk distribution and insurance in the commonly accepted sense, a framework that traces back to Helvering v. Le Gierse, 312 U.S. 531 (1941). The IRS has accepted that a parent can insure its subsidiaries when enough independent entities and exposures are involved (Revenue Rulings 2002-89, 2002-90, 2002-91, 2005-40 and 2008-8 are the usual references). Outcomes depend on the facts: how premiums were priced, whether claims were paid, whether the captive held capital the way an insurer would, and whether money moved back to the owners.

A large single-parent captive that insures hundreds of vehicles, locations and employees across many subsidiaries has a very different profile from a captive that writes a handful of policies for one family's businesses. See single-parent vs group captives: which structure fits? for how group structures supply spread. Smaller captives often try to buy spread by joining a reinsurance pool, which is exactly where the litigation has focused.

Section 831(b): tax on investment income only

Section 831(b) lets a qualifying small insurer pay tax on its taxable investment income and skip tax on premiums. The conditions:

• Premium cap. Net written premiums (or direct written premiums, if greater) of no more than $2,900,000 for taxable years beginning in 2026, per Rev. Proc. 2025-32, section 4.36. The figure is indexed for inflation, so check it each year.
• Diversification. Since the 2015 PATH Act took effect in 2017, either no single policyholder may account for more than 20% of premiums, or ownership of the captive may not differ from ownership of the insured businesses by more than 2 percentage points for any specified holder.
• Election. The captive makes the election itself, and it continues until revoked with IRS consent.

A foreign captive owned by U.S. persons can make a section 953(d) election to be taxed as a U.S. insurance company, which is how many offshore micro-captives reach these rules at all. A captive that does not elect 831(b), including nearly every captive with premiums above the cap, uses the regular computation described next.

Regular insurance company taxation

A captive taxed under subchapter L computes income this way:

• Underwriting income is premiums earned less losses incurred and expenses.
• Loss reserves are deductible only on a discounted basis under section 846, using IRS-published factors, and must be estimates rather than cushions. That timing difference is why a captive's tax profit and book profit differ.
• Investment income is taxed in full, with the usual dividends-received deduction when it holds stock.
• Unearned premium reserves are reduced by 20% in the tax computation (section 832(b)(4)).

The practical point: a captive taxed this way is not a tax shelter. Its benefit is mostly timing, plus keeping underwriting profit and investment growth inside a vehicle the owner controls instead of paying it to a commercial insurer.

Other taxes that catch captives

The domicile you choose changes premium tax and capital rules, not federal income tax. Vermont's minimum capital for a pure captive is $250,000 (8 V.S.A. § 6004). Domicile differences are covered in Captive domiciles compared: Vermont, Utah, Delaware and offshore; Delaware has its own regime (see Delaware).

What happens when money leaves the captive

Owners eventually want the profit. The usual routes:

• Dividends, taxed to individual shareholders at qualified dividend rates when they meet the rules.
• Liquidation, where owners receive liquidating distributions and pay capital gains on the excess over basis. The IRS scrutinizes this under step-transaction principles if the captive was formed with the exit already planned.
• Loans back to the insured or owners, which is where audits often start. Financing flows from a micro-captive to related parties are one of the two factors in the 2025 disclosure regulations.

The micro-captive cases

The IRS has litigated 831(b) captives for years. The decisions that matter most for planning:

• Avrahami v. Commissioner, 149 T.C. 144 (2017). The Tax Court found the arrangements were not insurance, citing a lack of risk distribution among other defects, and held the captive's 831(b) election invalid. It declined to impose accuracy penalties in that case.
• Reserve Mechanical Corp. v. Commissioner, 34 F.4th 881 (10th Cir. May 13, 2022). The Tenth Circuit affirmed that the captive was not engaged in the business of insurance, and stressed that it was not holding the forms of the transactions improper, noting that pools like the one Reserve used may be legitimate in other circumstances (opinion).
• Swift v. Commissioner, No. 24-60270 (5th Cir. July 16, 2025). The Fifth Circuit affirmed the disallowance for a medical practice's captives and upheld penalties, accepting the Tax Court's count of the 199 physicians, rather than millions of patient visits, as the relevant risks, and holding that pool participation did not rescue the arrangement (opinion).
• CFM Insurance, Inc. v. Commissioner, T.C. Memo. 2025-83, reached the IRS's result but disagreed with Swift on the risk distribution analysis, so the law is not fully settled.

Treasury's final regulations (T.D. 10029, 90 Fed. Reg. 3534, effective January 14, 2025) added section 1.6011-10, a listed transaction where an 831(b) captive has both a financing factor and a loss ratio under 30% over 10 years, and section 1.6011-11, a transaction of interest where it has either the financing factor or a loss ratio under 60%. Participants and material advisors must disclose. District courts reached different results on the rules in 2026, so their status is in litigation. The mechanics, forms and penalties are in Micro-captives (831(b)) and the IRS: rules, red flags and reporting.

A hypothetical comparison

Say a 300-employee trucking company in Tennessee pays $1.8 million a year for large deductible workers' compensation and auto liability, and forms a captive to write the layer above the deductible, with a fronting carrier issuing the policies. An independent actuary prices the premium, the captive holds loss reserves, and claims are paid from it. The deduction rests on real risk transfer among several operating entities, and 831(b) may not even apply if premiums exceed $2.9 million.

Compare a family that sets up a captive to insure a few hundred thousand dollars of "business interruption" and "regulatory change" risk for its own companies, with premiums reverse-engineered to land at the cap and almost no claims. The first has a business reason and a record. The second has the features the IRS and the courts have rejected.

Checklist before you rely on a tax result

1. Is there a genuine insurable risk, priced by an independent actuary?
2. Does the captive have enough independent risks, inside the group or through a bona fide pool, to distribute risk?
3. Are claims actually paid, and are loss ratios reasonable compared with commercial coverage?
4. Do any funds loop back to owners or affiliates as loans or other transfers?
5. Does the captive meet the 831(b) diversification test, and is premium under the 2026 cap?
6. Has the arrangement been checked against the 2025 disclosure rules, with Form 8886 filings in order where required?
7. Did a licensed advisor independent of the promoter review it? Penalty protection depends on reasonable reliance.

Run the numbers on retention before the tax discussion with the Total cost of risk (TCOR) calculator, and see Is a captive right for your business? A feasibility checklist for the business case.

Key takeaways

• The insured's deduction depends on the arrangement being insurance. That is the issue most audits turn on.
• For 2026, the 831(b) premium limit is $2,900,000, with a 20% single-policyholder or 2-point ownership diversification test.
• A captive that is not an 831(b) company is taxed under subchapter L with discounted loss reserves, and premiums sent to a foreign insurer carry a 4% federal excise tax.
• Avrahami, Reserve Mechanical and Swift show how courts treat captives with thin risk distribution, circular fund flows and little claim activity.
• Use tax counsel who is independent of any promoter.