§ 77. Tax budget. The amount of estimated expenditures contained in the annual estimate adopted by the common council, less the amount of estimated revenues applicable to the payment thereof and the amount of all judgments payable prior to the tax levy, shall constitute the tax budget. The common council shall levy and cause to be raised by tax the amount of said budget, and the amount shall be levied, assessed and raised by tax upon the real and personal property liable to taxation in the city at the time and in the manner provided by law.