The 401(k) plan administrator should know that your separation from service from the employer providing this plan was made after age 55, so they should use code 2 in box 7 of the Form 1099-R to show that the distribution is not subject to an early-distribution penalty. Still, if they use code 1 instead, you can claim the exception on line 2 of Form 5329 which TurboTax will prepare for you when you indicate to TurboTax the amount that qualifies for this penalty exception.
