Mo. Rev. Stat. § 86.337: Amount payable to general reserve fund — city's contribution.

The total amount payable to the retirement system for each fiscal year shall be not less than the normal contribution rate of the total compensation earnable by all members during the year; provided, however, that the aggregate payment by the said cities shall be sufficient when combined with the assets of the retirement system to provide the pensions and other benefits payable during the then current year.