The estimated expenditures plus the required cash reserve for the ensuing fiscal year or biennial period less all estimated and actual unencumbered balances at the beginning of the year or biennial period and less the estimated income from all sources, including motor vehicle taxes, other than taxation of personal and real property shall equal the amount to be received from taxes, and such amount shall be shown on the proposed budget statement pursuant to section 13-504. The amount to be raised from taxation of personal and real property, as determined above, plus the estimated revenue from other sources, including motor vehicle taxes, and the unencumbered balances shall equal the estimated expenditures, plus the necessary required cash reserve, for the ensuing year or biennial period.