You can upload and attach a copy of your 1099-B if you are using TurboTax Online. TurboTax CD/Download doesn’t support 1099-B upload.
if you’re using TurboTax CD/Download, TurboTax will generate Form 8453. You can still e-file your return, but you'll need to mail a paper copy of your 1099-B to the IRS along with Form 8453, which you can print from your online account or from the desktop software.
Mail these completed forms to the IRS at the address below by the tax-filing deadline:
Internal Revenue Service
Attn: Shipping and Receiving, 0254
Receipt and Control Branch
Austin, TX 73344-0254
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