65 ILCS 5/8-11-1.1
Beginning January 1, 1992 and through December 31, 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, and through September 30, 2002, 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 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.
Beginning October 1, 2002, and through December 31, 2013, an ordinance or resolution imposing or discontinuing the tax under this Section or effecting a change in the rate of tax must either (i) be adopted and a certified copy of the ordinance or resolution 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 and filing; or (ii) be adopted and a certified copy of the ordinance or resolution 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 the adoption and filing.
Beginning January 1, 2014, if an ordinance or resolution imposing the tax under this Section, discontinuing the tax under this Section, or effecting a change in the rate of tax under this Section is adopted, a certified copy thereof shall be filed with the Department of Revenue, either (i) on or before the first day of May, whereupon the Department shall proceed to administer and enforce this Section as of the first day of July next following the adoption and filing; or (ii) 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 the adoption and filing.
Notwithstanding any provision in this Section to the contrary, if, in a non-home rule municipality with more than 150,000 but fewer than 200,000 inhabitants, as determined by the last preceding federal decennial census, an ordinance or resolution under this Section imposes or discontinues a tax or changes the tax rate as of July 1, 2007, then that ordinance or resolution, together with a certification that the ordinance or resolution received referendum approval in the case of the imposition of the tax, must be adopted and a certified copy of that ordinance or resolution must be filed with the Department on or before May 15, 2007, whereupon the Department shall proceed to administer and enforce this Section as of July 1, 2007.
Notwithstanding any provision in this Section to the contrary, if, in a non-home rule municipality with more than 6,500 but fewer than 7,000 inhabitants, as determined by the last preceding federal decennial census, an ordinance or resolution under this Section imposes or discontinues a tax or changes the tax rate on or before May 20, 2009, then that ordinance or resolution, together with a certification that the ordinance or resolution received referendum approval in the case of the imposition of the tax, must be adopted and a certified copy of that ordinance or resolution must be filed with the Department on or before May 20, 2009, whereupon the Department shall proceed to administer and enforce this Section as of July 1, 2009.
A non-home rule municipality may file a certified copy of an ordinance or resolution with the Department of Revenue, as required under this Section, only after October 2, 2000.
The tax authorized by this Section may not be more than 1% and may be imposed only in 1/4% increments.
65 ILCS 5/8-11-1.1