Thank you very much for your answer. Yes, that must be the reason. I didn't report each transaction on a separate row. Turbotax automatically chose choice (b) for me; how can I change it to choice (a)? For choice b, I just print out the form 8949 from Turbotax and mail it to IRS. I feel this is completely waste of time. Since Turbotax already has the form 8949, why not go for choice (a)? Or at least, it can notify me to choose between a and b, not letting me mail after I efile.
- If you e-file your return but choose not to report each transaction on a separate row on the electronic return, you must either (a) include Form 8949 as a PDF attachment to your return, or (b) attach Form 8949 to Form 8453 (or the appropriate form in the Form 8453 series) and mail the forms to the IRS.
