You don't have to fix your tax return. One of the requirements to amend your tax return is that you made an error that affects your bottom line. You don't need to file an amended return if you correctly reported your cost basis and proceeds for your short-term transactions. Checking either box A or box C doesn't affect your refund (or amount due).
- Form 8949 Box c is Short-term transactions not reported to you on Form 1099-B. Box A is Short-term transactions reported on Form(s) 1099-B showing basis was reported to the IRS. By sending in your Form 8949 and entering your 1099-B forms, you've informed send in your cost basis.
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