Changes the effective date of the supplemental payments to qualified cities statute. Requires the state comptroller to distribute annual supplemental payments to qualified cities, that were not previously paid, using money sourced from a combination of: (1) amounts to be deducted from the amount payable to Gary under the disposition of tax revenue statute; and (2) money appropriated by the general assembly. Requires the city of Gary to repay to the state the amounts the state appropriates for the supplemental payments, once the total amount of supplemental payments has been made to qualified cities, through continued monthly deduction of Gary wagering tax, and until the full amount appropriated by the state is repaid.