Correction to macuser_22's post. Assuming that this is your own IRA and not an inherited IRA, you should enter into box 2a the same amount that is in box 1. The Form 1099-R that you will receive from the custodian will have box 2a equal to box 1. Although TurboTax ignores the value in box 2a under these circumstances unless you enter $0 which has special meaning, you should make entries that agree with those that will be on the Form 1099-R you will receive.
