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retailers, users or purchasers of motor fuel for purposes other than those with regard to which the taxes may be imposed as provided in those paragraphs to receive refunds of taxes improperly paid, which provisions may be at variance with the refund provisions as applicable under the Municipal Retailers Occupation Tax Act. The Department of Revenue may provide for certificates of registration for users or purchasers of motor fuel for purposes other than those with regard to which taxes may be imposed as provided in paragraphs (b) and (c) of this Section to facilitate the reporting and nontaxability of the exempt sales or uses. (m) Any ordinance imposing or discontinuing any tax under this Section shall be adopted and a certified copy thereof filed with the Department on or before June 1, whereupon the Department of Revenue shall proceed to administer and enforce this Section on behalf of the Authority as of September 1 next following such adoption and filing. Beginning January 1, 1992, an ordinance or resolution imposing or discontinuing the tax hereunder shall be adopted and a certified copy thereof filed with the Department on or before the first day of July, whereupon the Department shall proceed to administer and enforce this Section as of the first day of October next following such adoption and filing. Beginning January 1, 1993, an ordinance or resolution imposing, increasing, decreasing, or discontinuing the tax hereunder shall be adopted and a certified copy thereof filed with the Department, whereupon SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468