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an additional credit equal to .5% of the basis of qualified property placed in service during the taxable year, provided such property is placed in service on or after July 1, 1986, and the taxpayer's base employment within Illinois has increased by 1% or more over the preceding year as determined by the taxpayer's employment records filed with the Illinois Department of Employment Security. Taxpayers who are new to Illinois shall be deemed to have met the 1% growth in base employment for the first year in which they file employment records with the Illinois Department of Employment Security. The provisions added to this Section by Public Act 85-1200 (and restored by Public Act 87-895) shall be construed as declaratory of existing law and not as a new enactment. If, in any year, the increase in base employment within Illinois over the preceding year is less than 1%, the additional credit shall be limited to that percentage times a fraction, the numerator of which is .5% and the denominator of which is 1%, but shall not exceed .5%. The investment credit shall not be allowed to the extent that it would reduce a taxpayer's liability in any tax year below zero, nor may any credit for qualified property be allowed for any year other than the year in which the property was placed in service in Illinois. For tax years ending on or after December 31, 1987, and on or before December 31, 1988, the credit shall be allowed for the tax year in which the SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468