Michigan judgment interest calculator

For most civil money judgments, interest is 1% plus the average high yield at the auctions of 5-year Treasury notes in the six months before 1 January and 1 July, as certified by the State Treasurer (MCL 600.6013(8)). The Treasurer certified 3.959% for the half starting 1 July 2026, so the rate is 4.959%; the first half of 2026 was 4.725%.

Interest runs from the day the complaint was filed, is recalculated every six months at the rate then in force, and compounds annually. It is calculated on the whole judgment, including attorney fees and costs.

Courts read the statute as six-month intervals from the filing date: a complaint filed in August is recalculated each February and August, each time at the rate certified for the half-year just begun. For a long case, calculate each six-month step with its own rate, and add each year's interest to the balance on the anniversary.

Example: $80,000 for one six-month step at 4.959% is $1,983.60. This calculator applies one rate to the whole period; use it step by step for an exact figure.

A judgment on a written instrument that sets its own rate carries that rate, within the limits the statute sets. Other states are in the judgment interest calculator for every state.