Glossary
Statutory surplus
An insurer's admitted assets minus its liabilities under regulatory accounting rules, the capital cushion that stands behind policies beyond its loss reserves.
Also called: policyholders' surplus, policyholder surplus, capital and surplus
Statutory surplus is what is left when an insurer's liabilities, chiefly loss reserves and unearned premium, are subtracted from its admitted assets under statutory accounting principles (SAP), the rulebook state regulators require in annual statements. SAP is deliberately conservative. It counts only admitted assets that could be sold to pay claims and expenses policy acquisition costs up front, so a fast-growing insurer reports less surplus than its GAAP equity would suggest.
Surplus is the cushion that absorbs underwriting losses, reserve shortfalls and investment declines before policyholders are exposed, and it limits how much business a company can responsibly write. Regulators and raters compare it with premium volume and risk. The NAIC's risk-based capital formulas set the minimum surplus for an insurer's mix of risks, and capital strength is central to an AM Best rating. The guide on risk-based capital: how regulators measure insurer strength covers the mechanics.
Do not confuse the term with surplus lines. There, "surplus" describes coverage the admitted market will not write. The two meet in eligibility rules: NAIC Model 870 (2023) sets a $15 million capital and surplus minimum for insurers eligible to write surplus lines. For a buyer, a large surplus relative to premium written is one reason to prefer a carrier, though not the only one.
Last reviewed October 10, 2026