I'm still struggling with this issue. My tax forms from Fidelity for stock sales says specifically the following: short term transactions for which basis is NOT reported to the IRS. I then go to the supplemental to get my basis and input it into the fields. So when I do the easy forms, I choose short term basis not reported to IRS. However, I get an error when I am finished and want to check the taxes before filing that says only C or F are allowed. What am I doing wrong?
