No, it isn't for all entries. I have some of the cost basis in the "cost bases reported to IRS" section of the 1099B received from Fidelity, but with the cost suffixed with characters "(e)", and that is why I believe TurboTax did not accept the value and left as blank, and ask me to review again.
I learnt that I have to put the value Fidelity reported to IRS (which is in the form 1099B received from Fidelity, which is NOT adjusted) "as is" in the first page of the sales details in TurboTax, and click Next button until I meet the page where I can select options to input adjusted values for cost basis. Because Fidelity already has the values adjusted and provided in the "Supplemental Information", I could select "I already have all information...." instead of "guide me...". I then simply had to put the adjusted values Fidelity provided as "Supplemental Information".
Beware that if you use "Guide me..." option to input the adjusted cost bases, but do not complete to the end, or change later with the other option "I already have all information..." TurboTax messes up your data and won't allow input or change of some of the boxes. You will have to remove the sales from TurboTax and add it back yourself as a separate group. TurboTax doesn't allow clearing of the entry they messed up. They don't seem to be able to fix this bug for years.
I am using Desktop TurboTax Premier for Tax 2021.
