If your stock sales show that they are covered sales (the basis is reported to the IRS), you can include summary information in your tax return and not mail the 1099-B to the IRS.
If you have stock sales where the basis is not reported to the IRS then you need to mail the IRS your 1099-B, or list those sales separately in your tax return, so they appear on from 8949. If those sales are listed separately in your return, you do not need to mail your 1099-B to the IRS.
@aborshov
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