Yes. Keep in mind that I have seen no guidance from the IRS that indicates that unrecoverable basis in the Roth 401(k) can be treated as a rollover to a Roth IRA. However, it seems reasonable that if you don't (can't) claim a deduction for unrecoverable basis that that you would retain that basis. If you enter such a Form 1099-R into TurboTax and indicate that it was rolled over, TurboTax will add it to your basis that it tracks.
