Title II — TAX ON INCOME Their income and expenses for the fiscal year shall be deemed to have been earned and spent equally for each month of the period. The corporate income tax rate shall be applied on the amount computed by multiplying the number of months covered by the new rate within the fiscal year by the taxable income of the corporation for the period, divided by twelve. Provided, further, That the President, upon the recommendation of the Secretary of Finance, may, effective January 1, 2000, allow corporations the option to be taxed at fifteen percent (15%) of gross income as defined herein, after the following conditions have been satisfied: (1) A tax effort ratio of twenty percent (20%) of Gross National Product (GNP); (2) A ratio of forty percent (40%) of income tax collection to total tax revenues; (3) A VAT tax effort of four percent (4%) of GNP; and (4) A 0.9 percent (0.9%) ratio of the Consolidated Public Sector Financial Position (CPSFP) to GNP. The option to be taxed based on gross income shall be available only to firms whose ratio of cost of sales to gross sales or receipts from all sources does not exceed fifty-five percent (55%). The election of the gross income tax option by the corporation shall be irrevocable for three (3) consecutive taxable years during which the corporation is qualified under the scheme. For purposes of this Section, the term ‘gross income’ derived from business shall be equivalent to gross sales less sales returns, discounts and allowances and cost of goods sold. ‘Cost of goods sold’ shall include all business expenses directly incurred to produce the merchandise to bring them to their present location and use. For a trading or merchandising concern, ‘cost of goods sold’ shall include the invoice cost of the goods sold, plus import duties, freight in transporting the goods to the place where the goods are actually sold, including insurance while the goods are in transit. For a manufacturing concern, ‘cost of goods manufactured and sold’ shall include all costs of production of finished goods, such as raw materials used, direct labor and manufacturing overhead, freight cost, insurance premiums and other costs incurred to bring the raw materials to the factory or warehouse. National Internal Revenue Code of 1997 (as amended by the TRAIN Law, RAs 11256, 11346 and 11467) 27