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determine by its address whether a business is located in the business district. The municipality must provide this boundary and address information to the Department on or before April 1 for administration and enforcement of the tax under this subsection by the Department beginning on the following July 1 and on or before October 1 for administration and enforcement of the tax under this subsection by the Department beginning on the following January 1. The Department of Revenue shall not administer or 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. SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468