@BrimstoneFox
Too bad so much off-base misleading misinformation on this forum ...
IRS requires detail on some form 8949
or other forms with the same information and in the manner of Form 8949.
An Excel spreadsheet is perfectly acceptable.
Put a header with your name ssn and tax year.
As you pointed out, you only need to supply details of 1099-B covered transactions with adjustments (e.g. wash sales) that are not listed on your e-Filed Form 8949. and all non-covered transactions not listed there.
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If you are in the mood to invest the time and energy, and have a small number of wash sales.
you can enter wash sales manually into your e-Filed Form 8949.
Then you have to adjust the summary totals on Schedule D Line 1a.
No mailing is necessary.
