The rollover from the traditional IRA to a Roth IRA is a taxable event on your federal taxes. The amount of the conversion is added to our current income, raising your adjusted gross income.
Most state income tax returns begin with your federal adjusted gross income. Therefore, the higher federal income amount will also result in a higher state tax owed.
https://www.irs.gov/pub/irs-tege/rollover_chart.pdf
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