Don't waste your time. I was very fortunate. I normally file with turbotax, but tried Credit Karma because an update trubotax was waiting on prevented me from submitting my completed return for 2018.
A surprise 1099 came up for 2017 which had been filed with turbotax, requiring me to amend my 2017 return. It was a piece of cake using turbotax and because in the process I discovered I had left a lot of money on the table because of how I filed, I also decided to amend my 2016 and 2018 taxes.
Again it was a piece of cake for the 2016 taxes filed with turbotax, but for the 2018 taxes filed with Credit Karma, to this day 2/11/2020, from somewhere around November 2019 upon contacting Credit Karma via email, I have yet to receive an appreciable response beyond their automated acknowledgement of receipt of my inquiry, and that's with having sent a followup inquiry. Fortunately I had completed my return without sending it in turbotax and was able to retrieve it.
There's no way I'd file with Credit Karma again. It was crucial for me to be able to amend my 2017 taxes because I was facing a hefty tax bill as a result of the 1099 stemming from a student loan debt that was pardoned and subsequently increased my calculated income substantially for that year. I can't imagine how much of a drain on my mental state it would have been had my 2017 return been with Credit Karma instead of turbotax.
