You always want to e-file when possible. The program will tell you to print a form 8453 and you can attach a copy of your 1099-B forms. I recommend a copy of all 1099-Bs so that it is easier to verify and process. The IRS will sometimes ask for other forms as well. This helps them to know you sent it, verify you and the forms all together. The IRS does not normally look at the w2, 1099, etc for 2-3 years after filing and by computer, This allows a human to look and move on.
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