National Internal Revenue Code (NIRC)
Section 113. Invoicing and Accounting Requirements for VAT-Registered Persons. -
(A) Invoicing Requirements. - A VAT-registered person shall, for every sale, issue an invoice or receipt. In addition to the information required under Section 237, the following information shall be indicated in the invoice or receipt:
(1) A statement that the seller is a VAT-registered person, followed by his taxpayer's identification number (TIN); and
(2) The total amount which the purchaser pays or is obligated to pay to the seller with the indication that such amount includes the value-added tax.
(B) Accounting Requirements. - Notwithstanding the provisions of Section 233, all persons subject to the value-added tax under Sections 106 and 108 shall, in addition to the regular accounting records required, maintain a subsidiary sales journal and subsidiary purchase journal on which the daily sales and purchases are recorded. The subsidiary journals shall contain such information as may be required by the Secretary of Finance.