<s>[INST] Article 285 of Indian Constitution [/INST] Exemption of property of the Union from State taxation
(1) The property of the Union shall, save in so far as Parliament may by law otherwise provide, be exempt from all taxes imposed by a State or by any authority within a State
(2) Nothing in clause ( 1 ) shall, until Parliament by law otherwise provides, prevent any authority within a State from levying any tax on any property of the Union to which such property was immediately before the commencement of this Constitution liable or treated as liable, so long as that tax continues to be levied in that State"
Article 286 of Indian Constitution,"Restrictions as to imposition of tax on the sale or purchase of goods
(1) No law of a State shall impose, or authorise the imposition of, a tax on the sale or purchase of goods where such sale or purchase takes place
(a) outside the State; or
(b) in the course of the import of the goods into, or export of the goods out of, the territory of India
(2) Parliament may by law formulate principles for determining when a sale or purchase of goods takes place in any of the ways mentioned in clause ( 1 )
(3) Any law of a State shall, in so far as it imposes, or authorises the imposition of,
(a) a tax on the sale or purchase of goods declared by Parliament by law to be of special importance in inter State trade or commerce; or
(b) a tax on the sale or purchase of goods, being a tax of the nature referred to in sub clause (b), sub clause (c) or sub clause (d) of clause 29 A of Article 366, be subject to such restrictions and conditions in regard to the system of levy, rates and other incidents of the tax as Parliament may by law specify"," </s>