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paying or reimbursing business district project costs and obligations incurred in the payment of those costs. (b) The corporate authorities of a municipality that has designated a business district under this Law may, by ordinance, impose a Business District Retailers' Occupation Tax upon all persons engaged in the business of selling tangible personal property, other than an item of tangible personal property titled or registered with an agency of this State's government, at retail in the business district at a rate not to exceed 1% of the gross receipts from the sales made in the course of such business, to be imposed only in 0.25% increments. The tax may not be imposed on tangible personal property taxed at the rate of 1% under the Retailers' Occupation Tax Act (or at the 0% rate imposed under this amendatory Act of the 102nd General Assembly). Beginning December 1, 2019 and through December 31, 2020, 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 Section, "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 SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468