Mo. Rev. Stat. § 82.610

Effective January 1, 1976, the collector shall appoint such deputies, assistants, and clerks as he may by ordinance be authorized to appoint and who shall receive salaries fixed by ordinance of any constitutional charter city not located within a county. Salaries shall be paid out of the fees collected, deducted and retained as provided by sections 82.650 and 82.670. The term of office of each of the appointees shall be at the pleasure of the said collector but not to exceed the term of office of said collector of revenue.