National Internal Revenue Code (NIRC)
(a) Any person who, being required under Section 237 to issue receipts or sales or commercial invoices, fails or refuses to issue such receipts of invoices, issues receipts or invoices that do not truly reflect and/or contain all the information required to be shown therein, or uses multiple or double receipts or invoices, shall, upon conviction for each act or omission, be punished by a fine of not less than One thousand pesos (P1,000) but not more than Fifty thousand pesos (P50,000) and suffer imprisonment of not less than two (2) years but not more than four (4) years.
(b) Any person who commits any of the acts enumerated hereunder shall be penalized in the same manner and to the same extent as provided for in this Section:
(1) Printing of receipts or sales or commercial invoices without authority from the Bureau of Internal Revenue; or
(2) Printing of double or multiple sets of invoices or receipts; or
(3) Printing of unnumbered receipts or sales or commercial invoices, not bearing the name, business style, Taxpayer Identification Number, and business address of the person or entity.