2026 state judgment interest rules & data index

Compare the current recorded post-judgment reference, cited source, rate type, historical depth, and research status for every state and the District of Columbia. Missing legal mechanics stay labeled as unmodeled; they are never filled with a generic assumption.

Dataset compiled August 22, 2026. The index currently includes 50 numeric state or D.C. series and one jurisdiction without a uniform numeric default. A rate reference is not automatically a complete payoff rule.

What this index establishes

• Current reference coverage: 50 numeric post-judgment series are recorded; Mississippi is labeled case-specific instead of being assigned an invented rate.
• Rate behavior: the current inventory includes 15 fixed references, 22 variable formulas or official tables, and 10 explicitly branching headline series. A branch label warns that another rate may control.
• Historical depth: 15 jurisdictions have more than one verified effective-date observation. A one-row reference is never presented as a complete history.
• Calculation safety: only 1 state-specific calculator is released. Other states remain reference-only until the rate selection, accrual, interest base, compounding, day count, payments, and material exceptions are deterministic.

What “deeper rule review pending” means

It does not mean the displayed source or current reference is known to be wrong. It means the page has not yet earned a complete jurisdiction-specific explanation of scope, accrual, rate lock or reset, compounding, and official history. StatuteRates preserves that limitation rather than copying the same generic paragraph across every state.

Use the data without losing the caveats

Open a state page for its post- and prejudgment references, then open the rate page for the effective date, source receipt, structured rule analysis when available, JSON, and CSV. The historical rate lookup supports only reviewed series with enough official coverage to answer an old-date request without substituting today’s percentage. Developers can start with the API documentation or download the entity index as JSON.