For an IRA distribution, leave Box 2a empty if you don't know the taxable amount. Our software calculates taxable income by using the gross distribution you enter in Box 1 of the 1099-R screen and information you enter about your IRA account on the screens after the 1099-R screen.
Also make sure you check the IRA / SEP / SIMPLE box by Box 7 if it's checked on your Form 1099-R.
