Customs Modernization and Tariff Act
Section 103. When Importation Begins and Deemed Terminated. - Importation begins when the carrying vessel or aircraft enters the Philippine territory with the intention to unload therein. Importation is deemed terminated when:
(a) The duties, taxes and other charges due upon the goods have been paid or secured to be paid, at the port of entry unless the goods are free from duties, taxes and other charges and legal permit for withdrawal has been granted: or
(b) In case the goods are deemed free of duties, taxes and other charges, the goods have legally left the jurisdiction of the Bureau.