Addressing the reason that the Form 1099-R has code T instead of code Q, the Roth IRA custodian is using code T to indicate that they do not know the year for which you first made a Roth IRA contribution. Telling 2022 TurboTax that you had a Roth IRA prior to 2018 causes code T to be treated the same as code Q. If instead it has been less than 5 years since the beginning of the year for which you first made a Roth IRA contribution, the taxable amount of your Roth IRA distribution is calculated on Form 8606 Part III.
