Unfortunately, some people make regular payments on their restitution judgment while serving their federal prison sentence, only to get released and find that they still owe tens of thousands of dollars more than was originally imposed. The reason? Interest.
When a judge imposes restitution of more than $2,500, interest is automatically imposed by statute. 18 U.S.C. § 3612(f). Interest is calculated according to a formula set in the statute.
There likely is already a box on the judgment form for the court to check to waive the interest on restitution (or a fine).