831(b) Tax Code: Election, Premium Cap, and Compliance Rules

The 831(b) election is a choice a qualifying small non-life insurance company makes under Section 831(b) of the Internal Revenue Code to pay federal income tax only on its taxable investment income, with premiums excluded from the tax base entirely. Most companies using it are captive insurers formed by a business to cover its own risks. To qualify for a year, net written premiums (or direct written premiums, whichever is higher) must stay at or below $2,900,000 for 2026, the company must satisfy either a diversification test or an ownership test, and it must actually function as an insurance company. The election is made on Form 1120-PC and, once made, continues automatically in every later year the requirements are met.

What the Election Changes About Your Tax Bill

Under the default rule in Section 831(a), a non-life insurance company pays the 21% corporate income tax on all its taxable income, including underwriting profit from premiums minus losses paid. The 831(b) election replaces that calculation: the company’s tax equals 21% applied only to its taxable investment income, and premiums are not counted as gross income at all.¹

Taxable investment income is defined in Section 834 and covers interest, dividends, rents, royalties, and capital gains on the company’s investment portfolio, reduced by allowable deductions.² Income from any non-insurance trade or business the company runs is pulled in as well. In practice, a captive collecting $2 million in premiums and earning $100,000 on its reserves would owe tax on roughly the $100,000 rather than on the underwriting profit built into the premiums.

The Premium Ceiling

Section 831(b) sets a base premium cap of $2,200,000, indexed for inflation and rounded down to the nearest $50,000.³ For taxable years beginning in 2026, the adjusted ceiling is $2,900,000.⁴ The test uses the larger of net written premiums or direct written premiums. Exceed the number in any year and the election does not apply for that year.

You cannot slip past the cap by splitting premium among sibling captives. The statute requires aggregating premiums across every insurance company in the same controlled group, using the Section 1563(a) definition but with the ownership threshold lowered from 80% to more than 50%.¹ If one owner holds a majority stake in two captives, their combined premiums must fit under $2,900,000 for either to qualify.

The Diversification or Ownership Test

The PATH Act of 2015 added a second gate. A qualifying company must satisfy one of two tests each year.

Diversification

No single policyholder can account for more than 20% of the company’s net or direct written premiums (whichever is greater) for the year.¹ That effectively requires at least five unrelated policyholders. Related policyholders are treated as one under the family and business attribution rules of Sections 267(b) and 707(b), so five LLCs owned by the same family do not satisfy the test.

Ownership

A company that cannot pass diversification can still qualify by showing the captive’s ownership mirrors the ownership of the insured business. No “specified holder” (lineal descendants of the insured business’s owners, and their spouses) can hold a percentage of the captive that exceeds their percentage of the insured business’s assets by more than 2 percentage points.³ The statute treats that gap as de minimis. Spousal interests are combined. The rule targets arrangements where captive shares were gifted to children or trusts to shift wealth between generations.

Failing both tests disqualifies the company from the election for that year.

Making the Election

The election is made on Form 1120-PC, the income tax return for property and casualty insurance companies, by checking the 831(b) box in Item D. No separate statement is required.⁵ The return must be filed on time, including any valid extensions. Most companies elect in the first year they want 831(b) treatment.

Once made, the election stays in effect for every later year the company meets the premium cap and diversification requirements.¹ You do not re-elect annually. The election also does not vanish if you blow past the cap in a single year; it simply does not apply that year and reapplies automatically when you drop back under.

Revoking the Election

To permanently drop 831(b) status, Rev. Proc. 2025-13 provides a streamlined revocation with no user fee.⁶ The company submits a written request to the IRS signed under penalties of perjury that includes:

The company’s name, taxpayer identification number, address, and revocation year.
Timing: submission no later than the due date (including extensions) of the federal income tax return for the revocation year.
A representation that the company will not make another 831(b) election for five taxable years after the revocation year.
Confirmation that no prior-year 831(b) net operating losses would carry into the revocation year.

The revocation can take effect for the year the request is submitted or, if filed early enough, for the immediately preceding tax year.⁶ Companies with prior 831(b) NOL carryovers do not qualify for the streamlined process and must instead request a private letter ruling.

What Happens When You Fall Out of Compliance

A company that exceeds the premium ceiling or fails both diversification tests reverts to Section 831(a) for that year and pays regular corporate tax on its full taxable income, including underwriting profit.¹ The swing can be dramatic. A captive with $2 million in premiums and $100,000 in investment income might owe tax on roughly $100,000 under 831(b) and on well over $1 million under 831(a) if underwriting profit is large. The election itself, though, does not terminate; drop back below the cap and satisfy the diversification rules the next year and it applies again without refiling.

Operating as a Real Insurance Company

Clearing the statutory thresholds is not enough. The IRS also asks whether the captive genuinely operates as an insurer. The legal test requires four elements: risk shifting from the insured to the captive, risk distribution across a pool of unrelated risks, insurance risk (rather than investment or business risk), and behavior consistent with how insurance companies actually operate.

The Tax Court’s decision in Avrahami v. Commissioner shows how those elements are applied against captives that look more like tax shelters. The court found that the captive had never paid a claim before the audit began, invested reserves in illiquid loans to related parties instead of holding liquid assets, and charged inflated premiums for implausible risks such as terrorism coverage for small jewelry stores. The risk pool it participated in was a circular arrangement, with premiums flowing in and matching dollars flowing back out without real claim activity.

The practical implications are consistent. Premiums need independent actuarial support and should be in the range a commercial insurer would charge for similar coverage. The captive should maintain claims procedures and actually pay legitimate claims. Reserves should sit in liquid, conventional investments rather than loans back to the owner. Policies should cover real risks the insured business faces, described in clear language, not vague catchall coverage designed to justify moving cash into the captive.

Reportable Transaction Disclosure and Penalties

In January 2025 the IRS finalized regulations (T.D. 10029) classifying certain micro-captive transactions as “listed transactions” and others as “transactions of interest,” both of which are reportable transactions requiring formal disclosure.⁷ Listed transactions carry harsher penalties and more aggressive audit treatment.

Participants (the captive, its owners, the insured businesses, and their material advisors) must file Form 8886 with their tax returns for each year of participation, with a copy to the IRS Office of Tax Shelter Analysis.⁷

Failure to disclose triggers Section 6707A penalties. The penalty is generally 75% of the tax decrease from the transaction. The ceiling for listed transactions is $200,000 for corporations and $100,000 for individuals. For other reportable transactions, the ceiling is $50,000 for corporations and $10,000 for individuals. The floor is $10,000 for corporations and $5,000 for individuals regardless of type.⁸ These sit on top of any additional tax, interest, and accuracy-related penalties the IRS may assess if it disallows the premium deductions taken by the insured business.

Notice 2016-66 lists the specific red flags: coverage for implausible risks, premiums well above commercial market rates, no actuarial analysis, no claims-processing procedures, reserves held in speculative or illiquid assets, and policies that duplicate existing commercial coverage at very different prices.⁹ Not every 831(b) captive is a listed transaction or transaction of interest, but arrangements checking several of those boxes should expect scrutiny.

State Licensing Still Applies

The 831(b) election is a federal tax matter and does nothing to displace state insurance regulation. Every captive must be licensed in its domicile, whether a US state or an offshore jurisdiction. Most states require minimum initial capitalization (typically $100,000 or more for a pure captive), application fees often starting around $1,500, annual renewals, and premium taxes on either a percentage or flat-fee basis. Most domiciles also require annual audited financial statements, actuarial opinions on loss reserves, and periodic examinations. Compliance costs for accountants, actuaries, captive managers, and legal counsel add up, and a captive whose economics only work if you assume the tax benefit is exactly the kind of arrangement the IRS challenges.

1
Office of the Law Revision Counsel. 26 USC 831 – Tax on Insurance Companies Other Than Life Insurance Companies
2
Office of the Law Revision Counsel. 26 USC 834 – Determination of Taxable Investment Income
3
Office of the Law Revision Counsel. 26 USC 831 – Tax on Insurance Companies Other Than Life Insurance Companies
4
Internal Revenue Service. Rev. Proc. 2025-32
5
Internal Revenue Service. Instructions for Form 1120-PC
6
Internal Revenue Service. Rev. Proc. 2025-13
7
Federal Register. Micro-Captive Listed Transactions and Micro-Captive Transactions of Interest
8
Office of the Law Revision Counsel. 26 USC 6707A – Penalty for Failure to Include Reportable Transaction Information With Return
9
Internal Revenue Service. Transaction of Interest – Section 831(b) Micro-Captive Transactions Notice 2016-66