You won't be able to "attach" the detail of your 1099-B when you e-file your income tax return. However, if you need to send your Form 1099-B detail to the IRS, because you summarized your 1099-B forms in TurboTax, TurboTax will give you instructions on where to send in the detail once the IRS has accepted your income tax return.
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 within three (3) business days after you have received acknowledgement that the IRS has accepted your return.
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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