"TITLE IV - VALUE-ADDED TAX

"CHAPTER I - IMPOSITION OF TAX

"SECTION 105. Persons Liable. - Any person who, in the course of trade or business, sells, barters, exchanges, leases goods or properties, renders services, and any person who imports goods shall be subject to the value-added tax (VAT) imposed in Sections 106 to 108 of this Code.

"The value-added tax is an indirect tax and the amount of tax may be shifted or passed on to the buyer, transferee or lessee of the goods, properties or services. This rule shall likewise apply to existing contracts of sale or lease of goods, properties or services at the time of the effectivity of Republic Act No. 7716.

"The phrase 'in the course of trade or business' means the regular conduct or pursuit of a commercial or an economic activity, including transactions incidental thereto, by any person regardless of whether or not the person engaged therein is a nonstock, nonprofit private organization (irrespective of the disposition of its net income and whether or not it sells exclusively to members or their guests), or government entity.

"The rule of regularity, to the contrary notwithstanding, services as defined in this Code rendered in the Philippines by nonresident foreign persons shall be considered as being rendered in the course of trade or business.