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enforce any change made to the boundaries of a business district or address change, addition, or deletion until the municipality reports the boundary change or address change, addition, or deletion to the Department in the manner prescribed by the Department. The municipality must provide this boundary change information or address change, addition, or deletion to the Department on or before April 1 for administration and enforcement by the Department of the change beginning on the following July 1 and on or before October 1 for administration and enforcement by the Department of the change beginning on the following January 1. The retailers in the business district shall be responsible for charging the tax imposed under this subsection. If a retailer is incorrectly included or excluded from the list of those required to collect the tax under this subsection, both the Department of Revenue and the retailer shall be held harmless if they reasonably relied on information provided by the municipality. A municipality that imposes the tax under this subsection must submit to the Department of Revenue any other information as the Department may require for the administration and enforcement of the tax. Nothing in this subsection shall be construed to authorize the municipality to impose a tax upon the privilege of engaging in any business which under the Constitution of the United States may not be made the subject of taxation by the SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468