@fanfare OK - the instructions could be a lot clearer. Form 8453 says I need to mail in Form 8949, but it doesn't indicate any specific copy 8949, and your answer says that I don't need to mail in the 8949 that has a "see attached statement" line.
You then say that the "attached statement" is the document that needs to be mailed in with Form 8453, but you are not clear that a separate document is needed, not 8949. And you do not explain what document is needed, nor how to create it.
I presume that the "statement" is normally the pages of the brokerage 1099-B that lists the detailed Block "E" transactions.
