Mo. Rev. Stat. § 105.120: Penalty on delinquents.

Every such officer who shall fail to pay the amount found due from him on such settlement, and who shall be returned by the collector to the county commission as a delinquent, so that the collector shall be credited in his account with the amount of delinquency, shall forfeit five percent per month upon the amount due from the time it ought to have been paid until collected, which may be recovered by suit upon his official bond or otherwise according to law.