... indicate in the receipt or invoice the name, business style, address and TIN of the purchaser.
Source: http://www.bir.gov.ph/index.php/tax-code.html#title4
Sec 237, NIRC
SEC. 237. Issuance of Receipts or Sales or Commercial Invoices. - All persons subject to an internal revenue tax shall, for each sale or transfer of merchandise or for services rendered valued at Twenty-five pesos (P25.00) or more, issue duly registered receipts or sales or commercial invoices, prepared at least in duplicate, showing the date of transaction, quantity, unit cost and description of merchandise or nature of service: Provided, however, That where the receipt is issued to cover payment made as rentals, commissions, compensations, fees, receipts or invoices shall be issued which shall show the name, business style, if any, and address of the purchaser, customer or client: Provided, further, That where the purchaser is a VAT-registered person, in addition to the information herein required, the invoice or receipt shall further show the Taxpayer Identification Number (TIN) of the purchaser.
The original of each receipt or invoice shall be issued to the purchaser, customer or client at the time the transaction is effected, who, if engaged in business or in the exercise of profession, shall keep and preserve the same in his place of business for a period of three (3) years from the close of the taxable year in which such invoice or receipt was issued, while the duplicate shall be kept and preserved by the issuer, also in his place of business, for a like period.
