If you feel you would like to send the 1099-B with the 8949 and 8453 you can always include it, even if it's not required. The forms should be mailed within three days of your return acceptance at the IRS.
If you are e-filing your tax return, then mail your statements and Form 8949 (1099-Bs or other document showing detailed sales information) along with Form 8453 to:
Internal Revenue Service
Attn: Shipping and Receiving, 0254
Receipt and Control Branch
Austin, TX 73344-0254
If you need a blank Form 8453, you can download this pdf, enter your address information and check the box for Form 8949 (this form is really just a cover sheet).
@rushil89
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