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the provisions of Section 251 shall apply with respect to the credit under this subsection. For purposes of this subsection, "qualifying expenditures" means the qualifying expenditures as defined for the federal credit for increasing research activities which would be allowable under Section 41 of the Internal Revenue Code and which are conducted in this State, "qualifying expenditures for increasing research activities in this State" means the excess of qualifying expenditures for the taxable year in which incurred over qualifying expenditures for the base period, "qualifying expenditures for the base period" means the average of the qualifying expenditures for each year in the base period, and "base period" means the 3 taxable years immediately preceding the taxable year for which the determination is being made. Any credit in excess of the tax liability for the taxable year may be carried forward. A taxpayer may elect to have the unused credit shown on its final completed return carried over as a credit against the tax liability for the following 5 taxable years or until it has been fully used, whichever occurs first; provided that no credit earned in a tax year ending prior to December 31, 2003 may be carried forward to any year ending on or after December 31, 2003. If an unused credit is carried forward to a given year from 2 or more earlier years, that credit arising in the earliest year will be applied first against the tax liability for the SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468