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liability for the same calendar month of the preceding year" shall be determined as if the rate reduction to 1.25% in Public Act 102-700 on sales tax holiday items had not occurred. If any such quarter monthly payment is not paid at the time or in the amount required by this Section, then the taxpayer shall be liable for penalties and interest on the difference between the minimum amount due as a payment and the amount of such quarter monthly payment actually and timely paid, except insofar as the taxpayer has previously made payments for that month to the Department in excess of the minimum payments previously due as provided in this Section. The Department shall make reasonable rules and regulations to govern the quarter monthly payment amount and quarter monthly payment dates for taxpayers who file on other than a calendar monthly basis. The provisions of this paragraph apply before October 1, 2001. Without regard to whether a taxpayer is required to make quarter monthly payments as specified above, any taxpayer who is required by Section 2d of this Act to collect and remit prepaid taxes and has collected prepaid taxes which average in excess of $25,000 per month during the preceding 2 complete calendar quarters, shall file a return with the Department as required by Section 2f and shall make payments to the Department on or before the 7th, 15th, 22nd and last day of the month during which such liability is incurred. If the month during which such tax liability is incurred began prior to SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468