@iitmarty
I got one of those IRS letters. Was it a CP2000 reporting the missing income on the Sch D ?
It looks as though Turbo Tax failed to enter my Edward Jones income in 2020 and I now owe $2,294.00. TT is a DIY program where you are responsible for all the entries on the tax return. If you did not review the return carefully before you filed it and income was missing then this is a user error and not a program failing. Read the notice carefully ... they give you options on how to respond if you do not agree with their determination. Usually you can send them a copy of the 8949 & Sch D that was missing to add to your return or send in an amended return ... read the notice carefully and/or seek professional guidance.
