Section 5. Section one hundred eighty-three of Commonwealth Act Numbered Four hundred sixty-six, as amended, is hereby further amended to read as follows:

"Sec. 183. Payment of percentage taxes. (a) In general. It shall be the duty of every person conducting a business on which a percentage tax is imposed under this Title, to make a true and complete return of the amount of his, her or its gross monthly sales, receipts, or earnings, or gross value of output actually removed from the factory or mill warehouse and within ten days after the end of each month, pay the tax due thereon: Provided, That any person retiring from a business subject to the percentage tax shall notify the nearest internal revenue officer thereof, file his return or declaration, and pay the tax due thereon within ten days after closing his business.

"If the percentage tax on any business is not paid within the time prescribed above, the amount of the tax shall be increased by twenty-five per centum, the increment to be a part of the tax.

"In case of willful neglect to file the return within the period prescribed herein, or in case a false or fraudulent return is willfully made, there shall be added to the tax or to the deficiency tax, in case any payment has been made on the basis of such return before the discovery of the falsity or fraud, a surcharge of fifty per centum of its amount. The amount so added to any tax shall be collected at the same time and in the same manner and as part of the tax unless the tax has been paid before the discovery of the falsity or fraud, in which case the amount so added shall be collected in the same manner as the tax.

"(b) Sales tax on imported articles. When the articles are imported, the percentage taxes established in sections one hundred eighty-four, one hundred eighty-five, and one hundred eighty-six of this Code shall be paid in advance by the importer, in accordance with regulations promulgated by the Secretary of Finance and prior to the release of such articles from customs' custody, based on the import invoice value thereof, certified to as correct by the Philippine Consul at the port of origin if there is any, including freight, postage, insurance, commission, customs duty, and all similar charges, plus one hundred per centum of such total value in the case of articles enumerated in section one hundred and eighty-four; fifty per centum of such total value in case of articles enumerated in section one hundred and eighty-five; and twenty five per centum in the case of articles enumerated in section one hundred and eighty-six. The tax imposed in this section shall not apply to articles to be used by the importer himself in the manufacture or preparation of articles subject to specific tax or those for consignment abroad and are to form part thereof.

"In the case of tax-free articles brought or imported into the Philippines by persons, entities or agencies exempt from tax which are subsequently sold, transferred, or exchanged in the Philippines to non-exempt private persons or entities, the purchasers shall be considered the importers thereof. The tax due on such articles shall constitute a lien on the article itself superior to all other charges of liens, irrespective of the possessor thereof."