capital adequacy
Strip away all the formulas and one question remains, the one a policyholder actually cares about: when I make my claim — perhaps decades from now — will the money be there? Capital adequacy is the name for the answer being 'yes.' It is the condition of holding enough resources, over and above what you owe, that you can keep your promises even after a genuinely bad run of events. It is the whole point of everything else in this field; risk measures, capital requirements, and stress tests are all just ways of checking whether this single condition holds.
In practice, capital adequacy is judged by comparing the resources a firm has available to absorb losses (its own funds, surplus, or available capital) against the resources it is required to hold (its SCR, RBC, or economic capital). If available comfortably exceeds required, the firm is adequately capitalized; the ratio of the two is the headline solvency or coverage ratio that regulators, rating agencies and boards watch. Crucially the assessment is forward-looking and dynamic, not a one-off snapshot — a firm adequate today can become inadequate as markets move, claims emerge, or the business grows, which is why it is monitored continuously and projected forward in the ORSA. In many regimes a designated senior actuary — the appointed (or signing) actuary — is personally responsible for opining on the adequacy of reserves and capital and flagging concerns to the board and regulator.
Capital adequacy matters because it is, in the end, the public-trust contract of insurance: an inadequate insurer is one that may not be able to pay, and protecting policyholders from that is the reason capital regulation exists at all. Two honest cautions. First, 'adequate' is always relative to a chosen confidence level — a 1-in-200 standard still admits a 1-in-200 chance of failure; no regime promises certainty. Second, capital adequacy is necessary but not sufficient: a firm can pass every capital test and still fail through a liquidity squeeze (solvent on paper but unable to find cash) or through governance failures the numbers never revealed.
An insurer has 250 of available capital against a 100 SCR — a 250% coverage ratio, comfortably adequate. The appointed actuary signs an opinion confirming reserves and capital are sufficient, but flags in the ORSA that planned growth would erode the ratio to 130% in three years, prompting the board to plan a capital raise now.
Adequacy = available capital comfortably above required, and staying that way.
Capital adequacy is necessary but not sufficient — a fully capitalized insurer can still fail through a liquidity squeeze or governance breakdown, and 'adequate' always carries a residual failure probability.