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to 22.5% of the taxpayer's actual liability for the month or 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, 1989, and prior to January 1, 1996, each payment shall be in an amount equal to 22.5% of the taxpayer's actual liability for the month or 25% of the taxpayer's liability for the same calendar month of the preceding year or 100% of the taxpayer's actual liability for the quarter monthly reporting period. The amount of such quarter monthly payments shall be credited against the final tax liability of the taxpayer's return for that month. Before October 1, 2000, once applicable, the requirement of the making of quarter monthly payments to the Department shall continue until such taxpayer's average monthly liability to the Department during the preceding 4 complete calendar quarters (excluding the month of highest liability and the month of lowest liability) is less than $9,000, or until such taxpayer's average monthly liability to the Department as computed for each calendar quarter of the 4 preceding complete calendar quarter period is less than $10,000. However, if a taxpayer can show the Department that a substantial change in the taxpayer's business has occurred which causes the taxpayer to anticipate that his average monthly tax liability for the reasonably foreseeable future will fall below the $10,000 threshold stated above, then such taxpayer may petition the Department for change in such taxpayer's reporting status. On SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468