did you use Turbotax all those years? are you sure they weren't used? you have to look at Form 8582 each year to see if any passive losses were allowed and the carryover. the exception is PALs from Publicly Traded Partnerships (PTP). The carryover for rental activities would be on the schedule E Turbotax worksheet in the section Carryovers to 2020 Smart Worksheet. PTP losses don't flow through that form. For those, you need to look at the Turbotax K-1 form Section A,
if you started each year correctly and used Turbotax should have picked up any PAL carryforwards or asked about them in step-by-step mode.
please check prior returns to see what your situation is and post back including what type of activity produced the PAL - rental, partnership, S-Corp, other (?)
for any PALS that would flow through Form 8582 you'll probably need to see a pro because the c/o's would need to be adjusted for any that would have been utilized. Turbotax no longer supports those years so the proper calculations would not be possible.
