Form 1099-R box 2a is blank
Generally, retirement/IRA distributions from after-tax dollar contributions are partly taxable, if from pre-tax dollars they are taxable. If Form 1099-R, box 2a is blank make sure you answer the follow up question 'Verify box 2a'. Use your records to determine the taxable amount. If you don’t know and leave this blank TurboTax will use the gross distribution in box 1 as the taxable amount for box 2a. If you enter 0, no amount will be taxed.