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Occupation Tax Act, the Service Occupation Tax Act and the Service Use Tax Act, as shown by an original monthly return, the Department shall issue to the taxpayer a credit memorandum no later than 30 days after the date of payment, which memorandum may be submitted by the taxpayer to the Department in payment of tax liability subsequently to be remitted by the taxpayer to the Department or be assigned by the taxpayer to a similar taxpayer under this Act, the Retailers' Occupation Tax Act, the Service Occupation Tax Act or the Service Use Tax Act, in accordance with reasonable rules and regulations to be prescribed by the Department, except that if such excess payment is shown on an original monthly return and is made after December 31, 1986, no credit memorandum shall be issued, unless requested by the taxpayer. If no such request is made, the taxpayer may credit such excess payment against tax liability subsequently to be remitted by the taxpayer to the Department under this Act, the Retailers' Occupation Tax Act, the Service Occupation Tax Act or the Service Use Tax Act, in accordance with reasonable rules and regulations prescribed by the Department. If the Department subsequently determines that all or any part of the credit taken was not actually due to the taxpayer, the taxpayer's vendor's discount shall be reduced, if necessary, to reflect the difference between the credit taken and that actually due, and the taxpayer shall be liable for penalties and interest on such difference. If the retailer is otherwise required to file a monthly SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468