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(4) The basis of qualified property shall be the basis used to compute the depreciation deduction for federal income tax purposes. (5) If the basis of the property for federal income tax depreciation purposes is increased after it has been placed in service in Illinois by the taxpayer, the amount of such increase shall be deemed property placed in service on the date of such increase in basis. (6) The term "placed in service" shall have the same meaning as under Section 46 of the Internal Revenue Code. (7) If during any taxable year, any property ceases to be qualified property in the hands of the taxpayer within 48 months after being placed in service, or the situs of any qualified property is moved outside Illinois within 48 months after being placed in service, the Personal Property Tax Replacement Income Tax for such taxable year shall be increased. Such increase shall be determined by (i) recomputing the investment credit which would have been allowed for the year in which credit for such property was originally allowed by eliminating such property from such computation and, (ii) subtracting such recomputed credit from the amount of credit previously allowed. For the purposes of this paragraph (7), a reduction of the basis of qualified property resulting from a redetermination of the purchase price shall be deemed a disposition of qualified property to the extent SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468