Errors in some software, including TurboTax, could result in Vermont charging interest and penalties if taxpayers don't file amended returns by June 30.
Commissioner Mary Peterson says it's ultimately a taxpayer's responsibility if glitches in tax preparation software have caused an underpayment.
More than 19,000 filers who took itemized deductions should check to be sure their software or that used by their tax preparer capped deductions properly and avoided taking a deduction for state taxes paid in the previous year.
Peterson says the amounts owed vary widely but the average is about $160.
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