Definition:Post-judgment interest
⚖️ Post-judgment interest is interest that accrues on a court-awarded sum from the date the judgment is entered until the date it is fully paid. In the insurance context, post-judgment interest represents a significant and sometimes underappreciated exposure for insurers and reinsurers, particularly in liability lines where the interval between a verdict and final payment — often extended by appeals — can stretch for years. Because post-judgment interest is typically calculated on the full judgment amount, including any portion that exceeds policy limits, disputes frequently arise over whether the insurer or the policyholder bears responsibility for these additional costs, making it a recurring flashpoint in coverage litigation.
🔧 The mechanics of post-judgment interest are governed by statute rather than by the insurance contract itself, and the applicable rate and calculation method vary by jurisdiction. In the United States, rates differ state by state — some states set fixed statutory rates, while others tie the rate to a market benchmark, and federal courts apply their own formula under 28 U.S.C. § 1961. In the United Kingdom, the Judgments Act 1838 prescribes a statutory rate, though courts have discretion to award different rates in certain circumstances. From an insurer's operational perspective, post-judgment interest becomes a critical factor in reserving and settlement strategy: a claims handler evaluating whether to settle or defend must account for the possibility that interest accumulating during litigation could push total exposure well beyond the original indemnity amount. In excess and umbrella layers, the allocation of post-judgment interest between primary and excess carriers can be intensely contested.
📌 The financial impact of post-judgment interest has grown as verdicts in the United States, in particular, have escalated — a trend often discussed alongside social inflation and nuclear verdicts. A multi-million-dollar judgment that sits unpaid for several years during an appeals process can generate substantial additional liability, and in jurisdictions with high statutory rates, the interest component alone may rival the underlying damages. For this reason, sophisticated insurers and defense counsel increasingly factor post-judgment interest into their economic modeling of litigation outcomes, sometimes choosing to settle cases that might be defensible on the merits simply because the interest risk during an appeal is too great. Reinsurers and cedents must also agree on how post-judgment interest is allocated within treaty and facultative structures, an issue that has generated its own body of arbitration precedent.
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