(a) In counties of the second class the controller or in counties of the second class A the commissioners shall annually prepare a proposed budget for all funds for the next fiscal year no later than November 15 of the current fiscal year. Said budget shall reflect, as nearly as possible, the estimated revenues and expenditures of the county for the year for which the budget is prepared. It shall be unlawful to prepare and advertise notice of a proposed budget when the same is knowingly inaccurate. Where, upon any revision of the budget, it appears that the estimated expenditures in the adopted budget will be increased more than ten per cent in the aggregate over the proposed budget, it shall be presumed that the tentative budget was inaccurate, and such budget may not be legally adopted with any such increases therein unless the same is again advertised once as in the case of the proposed budget and an opportunity afforded to taxpayers to examine the same and protest such increases. Said budget shall be prepared on forms furnished as provided herein. Final action shall not be taken on the proposed budget by the county commissioners until after at least ten days public notice. The proposed budget shall be published or otherwise made available for public inspection, by all persons who may interest themselves, at least twenty days prior to the date set for the adoption of the budget. The county commissioners shall, after making such revisions and changes therein as appear advisable, adopt a budget for the next fiscal year prior to December 31 of the current fiscal year and necessary appropriation measures required to put it into effect.

(b) Within fifteen days after the adoption of the budget, the county commissioners shall file a copy of the same in the office of the Department of Community Affairs.

(c) The county commissioners may at any time, by resolution, make supplemental appropriations for any lawful purpose from any funds on hand or estimated to be received within the fiscal year and not otherwise appropriated, including the proceeds of any borrowing now or hereafter authorized by law.

(d) The county commissioners shall have power to authorize the transfer, within the same fund, of any unencumbered balance or any portion thereof from one spending agency to another, but such action shall be taken only during the last nine months of the fiscal year.

(e) No work shall be hired to be done, no materials purchased, no contracts made, and no order issued for the payment of any moneys by the county commissioners, which will cause the sums appropriated to be exceeded.