(1) Subject to the provisions of this Act, where proposals for general or supplementary appropriation of public funds are made to the House of Assembly and are embodied in an appropriation or supplementary appropriation Bill, as the case may be, the Cabinet may, for the purpose of raising revenue to meet the expenditure specified in any such Bill, by order, provide for the imposition of any tax or the variation of any existing tax, and from the date of the publication of such order in the Gazette (hereinafter referred to as “the commencement of the order”) the tax as imposed or varied by such order shall be payable.