The fiscal year of the city government shall begin on the first day of April and shall end on the last day of March of every calendar year unless the council by ordinance changes the fiscal year. The council may adopt an interim budget and make appropriations from available revenues for any interim period resulting from a change in the fiscal year.
The content and form of the city budget, its preparation and submission by the city manager to the council, public hearing thereon, consideration and adoption of the budget by the council, making of appropriations, and levy of property taxes shall be governed by law, this charter, and ordinances consistent with law and this charter.
(a) 
City manager to inform council.
The city manager shall inform the council from time to time as to the excess, sufficiency, or insufficiency of appropriations and of available revenues, and recommend such action by the council as he deems appropriate.
(b) 
Supplemental appropriations; amendments.
If the council finds during the fiscal year that there are available for appropriation in any fund revenues in excess of those estimated in the budget, the council by ordinance may make supplemental appropriations from the fund up to the amount of such excess. Conversely, if the council finds that the total available revenues in any fund are not or will not be as great as total appropriations, the council by ordinance shall provide additional revenue or reduce appropriations from the fund so that appropriations shall not exceed anticipated revenues. The council by ordinance may also otherwise amend the budget and the appropriations during the fiscal year. But total appropriations from a fund shall never exceed total anticipated revenues thereof in the budget as adopted or as amended, as the case may be.
(c) 
Transfer of appropriation balances.
(1) 
During the fiscal year, except as the council by ordinance may provide otherwise, the city manager may transfer unencumbered appropriation balances or parts thereof in a fund from one item of appropriation within a department, office, or agency to any other item of appropriation, including new items, in the fund, within the same department, office, or agency.
(2) 
The council, by motion, resolution, or ordinance, may transfer unencumbered appropriation balances or parts thereof from any item of appropriation, including an item for contingencies, in a fund to any other item of appropriation, including new items, in the fund.
In any fiscal year, in anticipation of revenues estimated in the budget for any fund, the council by resolution or ordinance may authorize the borrowing of money for the fund by the issuance of revenue-anticipation notes of the city. Such notes may be renewed from time to time, but all such notes and renewals thereof shall mature and be payable not later than the end of the fiscal year. Money for one fund may thus be borrowed from another fund of the city as well as from other sources.
Every appropriation, except an appropriation for a capital expenditure from a bond fund or other fund from which such expenditures may be lawfully authorized for more than one year, shall lapse at the close of the fiscal year to the extent that it has not been expended or lawfully encumbered. Such an appropriation for a capital expenditure shall continue in force until the purpose for which it was made has been accomplished or abandoned. In any case, the purpose of any such appropriation shall be deemed abandoned if three years pass without any disbursement from or encumbrance of the appropriation.