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highest liability and the month of lowest liability) is less than $19,000 or until such taxpayer's average monthly liability to the Department as computed for each calendar quarter of the 4 preceding complete calendar quarters is less than $20,000. If any such quarter monthly payment is not paid at the time or in the amount required, the taxpayer shall be liable for penalties and interest on such difference, except insofar as the taxpayer has previously made payments for that month in excess of the minimum payments previously due. If any payment provided for in this Section exceeds the taxpayer's liabilities under this Act, the Use Tax Act, the Service Occupation Tax Act, and the Service Use Tax Act, as shown on an original monthly return, the Department shall, if requested by the taxpayer, issue to the taxpayer a credit memorandum no later than 30 days after the date of payment. The credit evidenced by such credit memorandum may be assigned by the taxpayer to a similar taxpayer under this Act, the Use 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. If no such request is made, the taxpayer may credit such excess payment against tax liability subsequently to be remitted to the Department under this Act, the Use 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 determined that all or any part of the credit SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468