If the IRS form 1099-NEC reports $10,000 in self-employment income and $2,000 in per diem, report the total $12,000 as self-employment income.
Report the $2,000 as a separate miscellaneous expense and title it Per Diem paid on 1099 or some title that accurately describes the expense.
Retain all paperwork with your tax return file should a tax authority have a question at a later time.
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