Missouri Revised Statutes Title XXXV. Civil Procedure and Limitations § 506.369. Partial payment of court costs, when

1. If the court receiving a motion pursuant to section 506.366 determines that an offender is unable to pay the full amount of court costs due with respect to a case, the court shall assess a partial payment of the twenty percent of the greater of the following:

2. If a trial court has entered an order pursuant to subsection 1 of this section upon the filing of plaintiff's petition, the determination of the court shall apply to the case until final judgment is entered by either the trial or an appellate court.