I have received a paper 1099-NEC and wish to "attach" it to my Federal return yet still e-File.
The relevant NEC income is already accounted for (it was some rental assistance for a tenant, so just got counted as rent).
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As a rental property owner, I also prepare and e-File 1099-NEC's for contractors and tradespeople who work on the property, per recent IRS rules. For those I use the online system you mention.
