Title I — ORGANIZATION AND FUNCTION OF THE BUREAU OF INTERNAL REVENUE that such person is not declaring his correct income, sales or receipts for internal revenue tax purposes. The findings may be used as the basis for assessing the taxes for the other months or quarters of the same or different taxable years and such assessment shall be deemed prima facie correct. When it is found that a person has failed to issue receipts and invoices in violation of the requirements of Sections 113 and 237 of this Code, or when there is reason to believe that the books of accounts or other records do not correctly reflect the declarations made or to be made in a return required to be filed under the provisions of this Code, the Commissioner, after taking into account the sales, receipts, income or other taxable base of other persons engaged in similar businesses under similar situations or circumstances or after considering other relevant information, may prescribe a minimum amount of such gross receipts, sales and taxable base, and such amount so prescribed shall be prima facie correct for purposes of determining the internal revenue tax liabilities of such person. 4 (D) Authority to Terminate Taxable Period. — When it shall come to the knowledge of the Commissioner that a taxpayer is retiring from business subject to tax, or is intending to leave the Philippines or to remove his property therefrom or to hide or conceal his property, or is performing any act tending to obstruct the proceedings for the collection of the tax for the past or current quarter or year or to render the same totally or partly ineffective unless such proceedings are begun immediately, the Commissioner shall declare the tax period of such taxpayer terminated at any time and shall send the taxpayer a notice of such decision, together with a request for the immediate payment of the tax for the period so declared terminated and the tax for the preceding year or quarter, or such portion thereof as may be unpaid, and said taxes shall be due and payable immediately and shall be subject to all the penalties hereafter prescribed, unless paid within the time fixed in the demand made by the Commissioner. (E) Authority of the Commissioner to Prescribe Real Property Values. — The Commissioner is hereby authorized to divide the Philippines into different zones or areas and shall, upon mandatory3 consultation with competent appraisers both from the private and public sectors, and with prior notice to affected taxpayers,4 determine the fair market value of real properties located in each zone or area, subject to automatic adjustment once every three (3) years through rules and regulations issued by the 3 Introduced by Section 4 of the TRAIN Law. 4 Ibid. Isla Lipana & Co., the Philippine member firm of the PwC network