Customs Modernization and Tariff Act
Section 104. When Duty and Tax are Due on Imported Goods. - Except as otherwise provided for in this Act or in other laws, all goods, when imported into the Philippines, shall be subject to duty upon importation, including goods previously exported from the Philippines.
Unpaid duties, taxes and other charges, shall incur legal interest of twenty percent (20%) per annum computed from the date of final assessment under Section 429 of this Act, when payment becomes due and demandable. The legal interest shall likewise accrue on any fine or penalty imposed.
Upon payment of the duties, taxes and other charges, the Bureau shall issue the necessary receipt or document as proof of such payment.