Mo. Rev. Stat. § 33.290
Within two weeks after the approval of the appropriation acts by the governor, each department shall submit to the budget director a work program and requested allotments of appropriations by quarterly periods for the first fiscal year of the biennium. Such requested allotments shall show how the department proposes to classify its expenditures for various purposes and objects of expenditure within each such quarterly period for the fiscal year. Such allotment requests and the allotments as approved shall be in such form and in such detail as the budget director shall direct. Such allotments shall be subject to approval by the governor in such detail as he may determine except that the allotments of the departments not directly under the control of the governor shall be subject to approval only as to the total allotment for each quarter. At the end of any quarterly period any department may make changes in the allotments for the remaining periods upon approval of the governor. At the end of any quarterly period the governor may revise the allotments of any department, and if it shall appear that revenues in any fund for the fiscal year will fall below the estimated revenues for such fund to such extent that the total revenues of such fund will be less than the appropriations from such fund, then and in such case, the governor shall reduce the allotments of appropriations from such fund to any department or departments so that the total of the allotments for the fiscal year will not exceed the total estimated revenue of the fund at any such time. Each such department shall in its requested allotments set aside three percent of the appropriations as a reserve fund which shall be subject to expenditure only with approval of the governor; provided, that this shall not apply to amounts for personal service to pay salaries fixed by law. On or before June first of the first fiscal year of the biennium, similar work programs and requested allotments of the appropriation for the second fiscal year of the biennium shall be submitted to the budget director. Such requests and allotments shall be subject to the same approval, limitations and changes as those for the first year.
§ 33.290, RSMo