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taxpayer's actual liability under Section 2d. If the month during which such tax liability is incurred begins on or after January 1, 1986, 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 calendar year. If the month during which such tax liability is incurred begins on or after January 1, 1987, 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. The amount of such quarter monthly payments shall be credited against the final tax liability of the taxpayer's return for that month filed under this Section or Section 2f, as the case may be. Once applicable, the requirement of the making of quarter monthly payments to the Department pursuant to this paragraph shall continue until such taxpayer's average monthly prepaid tax collections during the preceding 2 complete calendar quarters is $25,000 or less. 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. The provisions of this paragraph apply on and after October 1, 2001. Without regard to whether a taxpayer is required to make quarter monthly payments as specified above, SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468