Amends the Property Tax Code. Provides that a claim for a refund resulting from a final order of the Property Tax Appeal Board shall not be allowed unless the claim is filed within 20 years from the date the right to a refund arose; provided, however, that the aggregate total of refunded taxes and interest shall not exceed $5,000,000 in any calendar year for claims filed more than 7 years after the right to the refund arose. Provides that if the payment of a claim for a refund would cause the aggregate total of taxes and interest to exceed $5,000,000 in any year, the refund shall be paid in the next succeeding year. Provides that the changes made by the amendatory Act apply to matters concerning refund claims filed on or after the first day of the first month following the effective date of the amendatory Act. Effective immediately.