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Before October 1, 2000, once applicable, the requirement of the making of quarter monthly payments to the Department by taxpayers having an average monthly tax liability of $10,000 or more as determined in the manner provided above 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 a change in such taxpayer's reporting status. On and after October 1, 2000, once applicable, the requirement of the making of quarter monthly payments to the Department by taxpayers having an average monthly tax liability of $20,000 or more as determined in the manner provided above 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 $19,000 or until such taxpayer's average monthly liability to the Department as SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468