If you have some sort of account that has no reporting to the IRS - or you are summarizing transactions where the basis was not reported, you have to either enter every transaction on the 8949 or send a printed statement along with Form 8453 by mail (not email) to the IRS. You can still e-file your return, but you would need to send the details to the IRS by regular US mail.
Click here for the details on how to mail it in.
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"
