Idaho Calculating Interest on a Judgment is the process of determining the amount of interest owed on a judgment. This can be done by calculating the interest rate and multiplying it by the length of time the judgment is outstanding. There are two different types of Idaho Calculating Interest on a Judgment: Simple Interest and Compound Interest. Simple Interest is calculated by multiplying the principal amount of the judgment by the interest rate for the length of time the judgment is outstanding. Compound Interest is calculated by multiplying the principal amount of the judgment by the interest rate for the length of time the judgment is outstanding and then adding the interest accrued for each period to the principal amount. This type of calculation can help determine the total amount owed on an outstanding judgment.