Captive Insurance for Benefits: When Your Company Is Big Enough to Be Its Own Carrier

A captive is a licensed insurance company you own, and it can replace or supplement your stop-loss carrier for employee benefits. Employers using captives have saved between 10% and 50% compared to the commercial market, according to Captive.com and Spring Consulting Group, because the captive earns underwriting profit and investment income on the premiums you'd otherwise hand to a carrier.

Most CFOs have heard the word "captive" and assumed it's for Fortune 500 companies. That assumption is costing you money.

What's the difference between a single-parent captive and a group captive?

A single-parent captive is owned and controlled by one company. A group captive lets several companies pool resources to insure their collective risks. Each structure has distinct requirements tied to company size and risk profile.

Single-parent captives give you complete control. You set underwriting standards, keep the profit, and make every decision. The tradeoff is cost.

Capitalization, domicile licensing, actuarial work, and ongoing administration aren't cheap. Most advisors put the practical floor at $5 million or more in annual health premium. That typically means 500+ employees before a single-parent structure pencils out.

Group captives are the on-ramp for mid-market employers. You share ownership with peer companies, pool stop-loss layers, and split the administrative overhead. Employers with 100–300 employees can reach captive economics they couldn't access alone.

The tradeoff is shared governance. You don't control the underwriting for the whole pool.

What size does your company need to be before a captive makes sense?

For group captives, 100–150 employees is a reasonable starting point. For single-parent captives, you're looking at 400–500 employees minimum. Size matters because a captive needs enough premium volume to absorb variance without blowing up in year one.

The math isn't just headcount. It's premium concentration and claim predictability. If one catastrophic claim represents 30% of your annual premium, a captive without adequate reinsurance will hurt you.

That's why stop-loss structure inside a captive arrangement matters as much as the captive structure itself. You can read more about how stop-loss layers interact with pooled risk in our article on group medical captives and stop-loss pooling.

Any business where health benefits represent 8–12% of total compensation cost is in the conversation. Industry doesn't determine eligibility. Premium volume and claim predictability do.

Which captive domicile should you choose?

Domicile is where your captive is licensed. It affects capitalization requirements, regulatory oversight, tax treatment, and formation cost. The most common options for U.S. employers are Vermont, Delaware, Tennessee, South Carolina, Utah, and offshore jurisdictions like the Cayman Islands and Bermuda.

Offshore domiciles have seen explosive growth. The Cayman Islands formed more captives in the first half of 2025 than in all of 2024, according to Innovative Captive Strategies. Offshore structures can offer lower capitalization minimums and favorable tax treatment, but they carry more regulatory scrutiny from the IRS and require careful legal structuring.

Onshore domiciles like Vermont are well-understood by regulators. They're often preferred for employee benefits captives because the regulatory framework is predictable. The right domicile depends on your premium volume, tax situation, and how much administrative complexity you're willing to carry. A captive attorney and actuary, not your broker, should drive that decision.

When does a captive outperform traditional stop-loss?

Traditional stop-loss is a commodity. Carriers price it to profit. When your claims experience is good, the carrier keeps the margin.

A captive flips that. Your good years build equity you own.

Group captive annual contribution increases typically run 3–6%, well below the 7–8% increases seen in fully insured markets, according to Captive.com and Spring Consulting Group. Contributions lock at renewal. That predictability alone has real budget value.

The bigger win is underwriting profit retention. When claims come in below projection, the margin stays inside your captive, not on a carrier's balance sheet.

The Washington State Office of Insurance Commissioner captive study modeled a $10 million premium scenario. It showed a discounted tax benefit of approximately $1.52 million in year one of a captive arrangement. That doesn't include underwriting profit.

There's also a regulatory advantage most employers miss. Labor Department approval is not required for employers using captives to fund certain employee benefit risks. That removes a layer of friction that stops many alternative funding strategies cold.

Captives underperform when claims are volatile and unpredictable, when your premium base is too thin to absorb variance, or when your captive is structured with inadequate reinsurance above the retention layer. Our piece on picking the right stop-loss attachment point gives you the framework for thinking through attachment points and cost exposure.

What does the legal foundation for captive insurance actually require?

The IRS has been clear since Helvering v. Le Gierse, 312 U.S. 531 (1941), as cited in the CPA Journal, that both risk shifting and risk distribution are required for a contract to qualify as insurance for tax purposes. Your captive has to actually transfer risk and spread it across enough independent exposures. A structure that lacks those elements gets recharacterized, and the tax benefits disappear.

This is why captive design isn't a DIY project. The actuarial work, the legal opinion, and the ongoing compliance infrastructure are what separate a legitimate captive from an IRS target. Captive participation is projected to hit record levels in 2026, with leading domiciles reporting steady year-over-year increases in new licenses, per Innovative Captive Strategies.

More formation activity means more scrutiny, not less. Confirm your advisor has direct captive experience, not just self-funded plan experience. They're related, but they're not the same. Our guide on how to evaluate a benefits consultant walks you through the questions worth asking before you sign anything.

Frequently asked questions

How much money can a captive actually save on employee benefits?

Employers funding employee benefit risks through captives can save between 10% and 50% compared to going to the commercial market, according to Spring Consulting Group via Captive.com. The range is wide because it depends on your claims experience, premium volume, and how well the captive is structured. Employers with consistently good claims history see the largest gains because they're keeping underwriting profit they previously surrendered to a carrier.

Can a company with 150 employees use a captive?

Yes, through a group captive. Group captives pool premium from multiple employers, making captive economics accessible to companies that couldn't support a single-parent structure. At 150 employees, you're generating enough premium to participate in most group captive programs. Single-parent captives typically require 400–500 employees or more, and $5 million or more in annual health premium, before the economics work.

What's the difference between a captive and being self-funded?

Self-funding means your company pays claims directly, usually with stop-loss insurance above a threshold. A captive is a licensed insurance entity you own that sits between your company and the commercial stop-loss market. You're still self-funded at the base, but the captive handles risk layers that would otherwise go to a carrier, and it keeps the profit when claims come in low. The Benefits Blake funding models resource breaks down the full spectrum of funding arrangements.

Is captive income taxable?

Captive taxation is complex and depends on domicile, structure, and IRS classification. Premiums paid to a captive may be deductible as a business expense if the arrangement meets risk shifting and risk distribution requirements established in Helvering v. Le Gierse. The Washington State Insurance Commissioner's captive study modeled approximately $1.52 million in discounted tax benefit on a $10 million premium in year one. You need a qualified tax attorney and actuary to model your specific situation.

Where do I start if I want to explore a captive for my benefits program?

Start by pulling your last three years of claims data and understanding your total annual health premium. Those two numbers tell you whether you're in the conversation for a group or single-parent structure. The Benefits Blueprint tool can help you assess where your current funding strategy sits and what alternatives make sense for your size and risk profile.