Executive Summary: Captive Arrangements: An Alternative Risk Structure for Employers Who Want More Control
LFP-02.07 — The Risk Layer#
A captive is an insurance company owned by the insureds it covers. In the employer health context, group captives allow multiple employers to pool risk through a structure they collectively own, retaining underwriting profit that would otherwise flow to a commercial stop loss carrier. The layered architecture parallels standard level funded: employers retain risk to a specific attachment point through individual claims funds, the captive assumes risk above that retention up to a defined threshold (replacing the commercial carrier), and the captive purchases its own reinsurance for catastrophic exposure above its retention. The surplus mechanism defines the economic advantage. When collective claims run below contributions, the surplus belongs to member employers as dividends, retained reserves, or future contribution reductions. Under commercial stop loss, underwriting profit stays with the carrier. Under the captive, it stays with the pool.
IRS Revenue Rulings 2002-89 and 2002-90 establish the tax framework: contributions to a properly structured captive are deductible as insurance premiums, provided the arrangement satisfies risk distribution and risk shifting criteria. This distinguishes legitimate health care captives, which pool genuine risk across multiple employers, from the 831(b) micro-captive arrangements the IRS has aggressively challenged as tax shelter vehicles.
Captives work for specific populations under specific conditions. Critical mass of 15 to 50 member employers, each of 10 or more lives, provides adequate premium volume and risk spread. Homogeneous industry membership improves actuarial predictability. The time horizon is essential: captive economics require a three-to-five-year minimum for surplus accumulation, contribution stability, and reinsurance savings to compound. Medical stop loss captives have historically produced better loss ratios than traditional stop loss programs, according to Guy Carpenter and Oliver Wyman. Sun Life reports a 93% average client retention rate in its captive solutions, reflecting the stability well-managed captive programs produce. Major U.S. captive domiciles include Vermont, Utah, Delaware, South Carolina, Tennessee, and Hawaii, with Vermont holding the longest regulatory track record.
Captives do not solve the actuarial problems at very small group sizes analyzed in LFP-02.08. Fixed governance and administrative costs, including captive manager fees, actuarial work, annual audit, and legal counsel, do not decline with pool size and can eliminate the economic advantage for small pools. Adverse selection among prospective member employers is a persistent risk: groups seeking to exit commercial markets after adverse claims experience degrade the captive pool if admission standards are not rigorously enforced, and governance dynamics among peer organizations can create pressure to admit members the actuarial analysis would reject. Employers who approach the captive as a passive arrangement rather than a governed risk management partnership are not captive candidates. The structure offers genuine long-term advantage for the right population and a governance burden the wrong population cannot sustain.