Get your taxes done using TurboTax

I am also having a problem locating my 2020 tax returns.  I used the Credit Karma tax return service for 2020.  I can not find tax return documents of any kind on the Credit Karma site, and the Turbotax is stating that I did not file with them in 2020 (technically true).  Where am I supposed to find my 2020 tax return documents?