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property within the business district, either in the form of tangible personal property or in the form of real estate as an incident to a sale of service. The tax shall be imposed at the same rate as the tax imposed in subsection (b) and shall not exceed 1% of the selling price of tangible personal property so transferred within the business district, to be imposed only in 0.25% increments. The tax may not be imposed on tangible personal property taxed at the 1% rate under the Service Occupation Tax Act (or at the 0% rate imposed under this amendatory Act of the 102nd General Assembly). Beginning December 1, 2019, this tax is not imposed on sales of aviation fuel unless the tax revenue is expended for airport-related purposes. If the District does not have an airport-related purpose to which it dedicates aviation fuel tax revenue, then aviation fuel is excluded from the tax. Each municipality must comply with the certification requirements for airport-related purposes under Section 2-22 of the Retailers' Occupation Tax Act. For purposes of this Act, "airport-related purposes" has the meaning ascribed in Section 6z-20.2 of the State Finance Act. Beginning January 1, 2021, this tax is not imposed on sales of aviation fuel for so long as the revenue use requirements of 49 U.S.C. 47107(b) and 49 U.S.C. 47133 are binding on the District. The tax imposed under this subsection and all civil penalties that may be assessed as an incident thereof shall be collected and enforced by the Department of Revenue. The SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468