The IRS has certain forms that must be mailed in. Usually the 1099-B is also required to be mailed with the 8949. That way the IRS can see the form in your return along with the paperwork that generated it.
there are trades where the cost basis is not reported to the IRS. the IRS requires details on exh of these trades. if multiple trades are lumped together on the 8949, then to only way to submit detail to the IRS is through form 8453 with the details contained on the 1099-B
Thanks - I've had these in prior years and never had to mail these forms when e-filed.
Thank you - I've never had to mail a 1099b or mail these forms when I e-filed with cap gains of stock where the basis was not reported to the IRS . The 1099B :Box E checked.