Mo. Rev. Stat. § 139.400
If the township collector shall be unable to collect any taxes charged in the tax list, by reason of the removal or insolvency of the person to whom such tax may be charged, or on account of any error in the tax list, he shall deliver to the county treasurer his tax book, and shall make out and file with said treasurer, at the time of his settlement, a statement in writing, setting forth the name of the person charged with such tax, the value of the property, and the amount of tax so charged and the cause of the delinquency, and shall make oath before the county clerk, or some associate circuit judge, that the facts stated in such statement are true and correct, and that the sums mentioned therein remain unpaid, and that he used due diligence to collect the same, which oath or affidavit shall be signed by the township collector; and upon filing said statement, the county treasurer shall allow the township collector credit for the amount of taxes therein stated, and shall apportion and credit the same on the several funds for which such tax was charged; and when he makes settlement with the county commission, such statement shall be a sufficient voucher to entitle him to credit for the amount therein stated; but in no case shall any township collector, or county treasurer, be entitled to abatement on the resident tax list until the statement and affidavit aforesaid are filed as required by this chapter.
(RSMo 1939 § 14016)
Prior revisions: 1929 § 12339; 1919 § 13252; 1909 § 11740