In some cases, taxpayers will receive IRS form 8949's from a provider or provider(s). Taxpayers will enter the information in summary fashion.
The IRS form 8949 is then uploaded as a .pdf and electronically filed or IRS form 8949 is mailed with an IRS form 8453 within three business days of receiving the acknowledgement that the IRS has accepted the electronically filed tax return.
If your Federal 1040 tax return has been electronically filed and accepted by the IRS, the IRS will be expecting to receive IRS form 8453. In your case, the attachment is to be IRS form 8949 or similar documentation.
What information did you use to generate IRS form 8949 / Schedule D Capital Gains and Losses information? Did you receive IRS form 1099-B information from a broker? Did you receive this information on paper? Or did you receive it electronically? Please clarify.
If your electronically filed tax return is accepted by the IRS, this is probably the information that should be enclosed with IRS form 8453 and mailed to the IRS.
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