If the capital loss was reported on Form 1099-B, you would need to upgrade from the free edition of TurboTax in order to amend your return. Otherwise, as long as you don't add anything other than the list below, you can amend your return at no additional charge.
Situations covered in TurboTax Free (assuming no added tax complexity):
- W-2 income
- Interest or dividends (1099-INT/1099-DIV) that don’t require filing a Schedule B
- IRS standard deduction
- Earned Income Tax Credit (EITC)
- Child Tax Credit (CTC)
- Student loan interest deduction
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