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 New Hampshire, interest rates on judgments are governed by state statutes. Prejudgment interest is the interest accrued from the time the money is owed until a judgment is entered, and post-judgment interest accrues from the time the judgment is entered until the amount is paid. The New Hampshire Revised Statutes Annotated (RSA) 524:1-b establishes the rate of interest in civil actions, including both prejudgment and post-judgment interest. As of the knowledge cutoff in 2023, the rate is set at the annual federal reserve discount rate plus 3%, with a minimum rate of 7% per annum unless the court orders otherwise. This rate is subject to change, so it is important to consult the current statutes or an attorney for the most up-to-date information. Additionally, parties to a lawsuit should be aware that different rates may apply under specific contractual agreements or other special circumstances, which may also be subject to legal limitations.