The correct solution is to use aggregation aka enter a summary.
TurboTax Online will ask you for a PDF copy of your consolidated 1099-B,
so no mailing is necessary.
Otherwise, mail the transaction details to the IRS within three business days of IRS accepting your e-Filed tax return.
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Detail Reporting Exception: if you summarize Category A or Category D, Form 8949 is not needed for transactions without adjustments. No mailing is necessary. No attachment is necessary.
