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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 September 1, 1985 (the effective date of Public Act 84-221), each payment shall be in an amount not less than 22.5% of the 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. SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468