Mo. Rev. Stat. § 33.240: Estimates of anticipated revenue to be furnished.

The budget director shall prepare estimates of revenue for each fund for each fiscal year of the biennium to which the budget applies, so classified as to show in detail the amounts expected to be received from each source. He may require each department collecting or receiving any revenues or earnings from any source to submit to him its estimates of expected revenue or earnings from each source as an aid to him in preparing revenue estimates. In parallel columns with such estimates, he shall show the actual revenues for each fund and source in the first fiscal year of the current biennium and the estimated revenues for the second fiscal year of the current biennium.