REVENUE REGULATIONS NO. 4-2000 issued August 15, 2000 prescribes the posting in places of business of a notice on the requirement for the issuance of sales/commercial invoices and/or official receipts by persons engaged in trade or business, including the exercise of profession. Issuance of invoices/receipts is not required for every sale valued at P 25 or below by a non-VAT taxpayer. Failure and neglect to post the notice required and/or deliberate removal of the notice constitute violation of the regulations. Any person who commits any of the said violation shall, upon conviction, be punished by a fine of not more than One Thousand Pesos (P1,000) or suffer imprisonment of not more than six (6) months, or both. In case of corporations, partnerships or associations, the penalty shall be imposed on the president, partner, general manager, branch manager, officer-in-charge and/or employees responsible for the violation.