I have a T215 Past Service Pension Adjustment Exempt from Certification. Which TurboTax version do I need to use to report it? I couldn't find it in Free version.

As per CRA- There is nothing for you to do with the T215 slip- This is for your records only- The slip will be sent directly to the CRA and they will adjust your RRSP deduction limit accordingly.

Information for the employee

• The PSPA amount in box 2 will decrease your RRSP and PRPP deduction limit for the year following the year shown in box 1. Example: If the year shown in box 1 is 2019, the amount in box 2 will decrease your RRSP and PRPP deduction limit for 2020.
• Do not send a copy of this slip to us. We will adjust your RRSP and PRPP deduction limits based on the original T215 slip submitted by your registered pension plan administrator.