The IRS set the 2026 ceiling on premiums a captive can write under the Section 831(b) election at $2.9 million, up from $2.85 million in 2025. The figure appears in Rev. Proc. 2025-32, the annual inflation-adjusted-items release published October 9, 2025, and reflects the $50,000 indexing increment that has moved the cap in recent years. Trade coverage read it as more tax-free room to fund. Captive Review led with the added capacity. The reserve story runs the other way.
Under the 831(b) election, a qualifying small insurer pays tax only on investment income and excludes underwriting profit, so the premium ceiling is a funding lever. But 2026 is the first full tax year operating under the January 2025 final regulations on micro-captive disclosure. Those rules turn the loss estimate into a compliance test, and a higher cap raises the bar.
The reserve mechanism: a bigger denominator
The final regulations set three objective tests. The 20% relationship test looks at ownership concentration between the insured and the captive. The financing factor targets premiums recycled back to owners through loans or similar transfers in the prior five years. The one that is actuarial is the loss-ratio factor: a captive whose insured losses and claim-administration expenses fall below 30% of premiums over the computation period (up to 10 years) is a listed transaction, and below 60% is a transaction of interest requiring disclosure.
That ratio is a fraction, and premium is the denominator. Write more premium toward the $2.9 million cap and the denominator grows, so the loss and expense estimate has to keep pace or the ratio drifts downward toward the 30% and 60% lines. A captive that comfortably cleared 60% at $2 million of premium can slide under it at $2.9 million on the same book of claims. The reserve estimate, meaning the unpaid claim and expense provision that feeds the ratio, is what holds the captive above the threshold. That is why reserve adequacy here is not an actuarial nicety; it is the tax-compliance gate.
The disclosure regime itself is contested. In CIC Services, LLC v. IRS (E.D. Tenn., March 5, 2026), the court upheld the framework as a reporting rule. Six weeks later, in Drake Plastics (S.D. Tex., April 16, 2026), a different court vacated the listed-transaction designation while leaving the 60% transaction-of-interest rule standing. The venues split, but the 30% and 60% loss-ratio benchmarks are now the shared reference point either way, so the reserve number matters regardless of which ruling controls a given captive.
Who it affects
The exposure sits with owners of single-parent 831(b) captives: closely held manufacturers, contractors, real estate holders, and professional firms funding hard-to-place risk. Mid-market self-insureds weighing an election now face a funding-versus-compliance tradeoff, because the extra $50,000 of capacity is worth nothing if using it pushes the loss ratio into disclosure territory.
Where this shows up in your reserves
Look at the incurred loss and allocated loss adjustment expense line as a percentage of earned premium over your computation period. That is the loss-ratio factor in plain form. If you are funding to a confidence level, check that the selected reserve, not just the discounted booked figure, keeps the ratio above 60%; aggressive discounting can quietly thin the numerator.
Decision-maker checklist
- Recompute your loss and expense ratio against the 30% and 60% factors at $2.9 million of premium, not at last year’s level.
- Confirm the actuary’s selected estimate, not a stripped case-reserve figure, is what feeds the ratio.
- Ask whether writing to the full cap would drop you below 60% and, if so, whether the funding is worth the disclosure.
- Document the reserve opinion well enough to support risk-transfer substance if the disclosure regime triggers a look.