All states have their own rules for adding interest to judgments. Sometimes called statutory charges, because the amount of interest is set by law.
Typically, interest begins to accrue from the date the judgment is rendered until the judgment is paid in full.
Use this Garnishment Laws and Procedures link to learn what about your State’s interest rate on judgments. After locating your state’s garnishment procedures, look at the “Interest Rate at which Judgments Accrue ” section located just after the procedures.