No officer, board, body or commission shall, during any fiscal year, expend any money (except to pay notes, bonds or interest thereon), incur any liability, or enter into any contract which by its terms involves the expenditure of money for any purpose for which no appropriation is provided, or in excess of the amount appropriated for such purpose.
Any contract made in violation hereof shall be null and void, and no moneys shall be paid thereon.
Nothing in this section contained, however, shall prevent the making of contracts or the spending of money for
Nothing in this section shall apply to the use of funds of departments, for the operation of which budget appropriations are not made, nor to contracts for professional services for the liquidation or foreclosure of tax title liens in such municipalities wherein it is agreed that the cost of the services are to be paid, in all or in part, from the funds derived, or to be derived from the redemption of liened property or the sale of foreclosed property. The use of funds of such departments and for such service contracts shall be subject to approval of the Director of the Division of Local Government Services in the Department of Community Affairs.
N.J.S. § 40A:4-57