You must report all income you receive on your tax return. That includes Forms 1099-K, 1099-NEC, and 1099-MISC, and also any cash, property or goods you received that were not reported on a form. If the amounts are duplicates then you can expense the duplicate amount on your Schedule C (Self-employed profit or loss), as Other miscellaneous expenses. For the description, put in "1099 income reported twice" and then enter the amount of the duplicate income.
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