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imposing or discontinuing the tax hereunder or effecting a change in the rate thereof 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 or discontinuing the tax hereunder or effecting a change in the rate thereof shall be adopted and a certified copy thereof filed with the Department on or before the first day of October, whereupon the Department shall proceed to administer and enforce this Section as of the first day of January next following such adoption and filing. However, a municipality located in a county with a population in excess of 3,000,000 that elected to become a home rule unit at the general primary election in 1994 may adopt an ordinance or resolution imposing the tax under this Section and file a certified copy of the ordinance or resolution with the Department on or before July 1, 1994. The Department shall then proceed to administer and enforce this Section as of October 1, 1994. Beginning April 1, 1998, an ordinance or resolution imposing or discontinuing the tax hereunder or effecting a change in the rate thereof shall either (i) be adopted and a certified copy thereof filed with the Department on or before the first day of April, whereupon the Department shall proceed to administer and enforce this Section as of the first day of July next following the adoption SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468