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Piggy-backing on this question...  My child 14-yo received a 1099-NEC for $630 for refereeing youth hockey.  He has no other earned income.  He spent $300 in 2021 buying refereeing equipment.  Sounds like he need to file?  Can he deduct the equipment expense?  Is it possible to transfer the $630 to other income since he is not in the business of refereeing?  I am trying to use the TurboTax free version to file.  Thanks!