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quarters, he shall file a return with the Department each month by the 20th day of the month next following the month during which such tax liability is incurred and shall make payment 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 January 1, 1985, each payment shall be in an amount equal to 1/4 of the taxpayer's actual liability for the month or an amount set by the Department not to exceed 1/4 of the average monthly liability of the taxpayer to the Department for the preceding 4 complete calendar quarters (excluding the month of highest liability and the month of lowest liability in such 4 quarter period). If the month during which such tax liability is incurred begins on or after January 1, 1985, and prior to January 1, 1987, each payment shall be in an amount equal to 22.5% of the taxpayer's actual liability for the month or 27.5% of the taxpayer's liability for the same calendar month of the preceding year. If the month during which such tax liability is incurred begins on or after January 1, 1987, and prior to January 1, 1988, each payment shall be in an amount equal to 22.5% of the taxpayer's actual liability for the month or 26.25% of the taxpayer's liability for the same calendar month of the preceding year. If the month during which such tax liability is incurred begins on or after January 1, 1988, and prior to January 1, 1989, or begins on or after January 1, 1996, each payment shall be in an amount equal SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468