Interest rates are compensation for the time-value of money, and are calculated on judgments (the amount of money one party to a lawsuit is ordered to pay another party) based on the applicable state or federal statutes. There are often different interest rates set by law for prejudgment interest (the interest on the amount owed before the judgment) and post-judgment interest (the interest on the amount owed after the judgment). The calculation of prejudgment and post-judgment interest rates vary from state to state (and in federal court), and require a careful analysis of the statutes.

In Maine, interest rates on judgments are governed by state statutes. Prejudgment interest, which is the interest accrued from the time the money is owed until a judgment is made, is calculated according to the rate set forth in Title 14, Section 1602-B of the Maine Revised Statutes. As of the knowledge cutoff in 2023, this rate is typically set at the 52-week average discount rate for 52-week United States Treasury bills, plus 6%. Post-judgment interest, which is the interest that accrues after a judgment has been entered, is also governed by Maine law, specifically Title 14, Section 1602-C. The post-judgment interest rate is the same as the prejudgment rate unless the judgment specifies otherwise. It is important to note that these rates can be updated and may vary depending on specific circumstances or changes in the law. Therefore, it is advisable to consult the current statutes or an attorney for the most up-to-date information regarding interest rates on judgments in Maine.