For the purposes of computing the 'index of taxpaying ability' pursuant to item (3) of Section 3 of Act 163 of 1977 (South Carolina Education Finance Act) for any area in which tax increment financing plan is in effect the value to be used shall be the original assessed value plus any portion of the captured assessed value which is distributed among taxing authorities pursuant to Section 31-8-120.
S.C. Code § 59-20-25