IF you have to mail anything, then a consolidated form makes the most sense. The IRS has received the full copy from the broker already. The IRS will contact you if they need more information.
Instructions for Form 8949 (2020) | Internal Revenue Service states: 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. (However, you can't attach a paper Form 8949 to Form 8453-FE.) You can attach one or more statements containing all the same information as Form 8949, instead of attaching Form 8949, if the statements are in a format similar to Form 8949.
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