It's OK to send in copies of form 8453, form 8949 and the brokerage statements.
TurboTaxAnthony provides excellent guidance:
The answer below is going to assume that you choose to use the summary transaction method of reporting your 1099B transactions instead of entering individual sales.
Yes, you will need to physically mail the Form 8949 along with Form 8453 and your summary statements from your broker. You need to do this when you choose the summary transaction method, which is why TurboTax is prompted you with this information.
What type of statements you need to include depends on what information is included on your 1099B. If you have transactions (other than sales of collectibles) for which:
- You received a Form 1099-B (or substitute statement) that shows basis was reported to the IRS and doesn't show any adjustments in box 1f or 1g,
- The Ordinary box in box 2 isn’t checked, and
- You don't need to make any adjustments to the basis or type of gain or loss reported on Form 1099-B (or substitute statement), or to your gain or loss.
Then, you don't have to include the supporting details of each transaction and you can just include the summary statements. If the above doesn't apply, then you will need to send both the summary statement from your broker and the individual transaction detail statements (1099B). If you are unsure, then you should send both the summary and the full 1099Bs.
E-filed returns – Within three days after the IRS has accepted your return, mail the Form 8949 generated by TurboTax, a copy of the summary statements provided by your broker, and the Form 8453 generated by TurboTax, to the following address:
Internal Revenue Service
Attn: Shipping and Receiving, 0254
Receipt and Control Branch
Austin, TX 73344-0254
Click this link for a copy of Form 8453: Form 8453
[Edited | 3/13/2020 | 1:00pm PDT]
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