The rollover from the IRA to a Roth IRA will be taxable. If federal (and state if applicable) tax has not been withheld, you'll need to pay estimated tax. The way to proceed would be to estimate the tax due (taking into account your deferred compensation in 2020 and the tax withheld) and to pay it in 4 equal installments on 4/15/2020, 6/15/2020, 9/15/2020 and 1/15/2021.
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