If the payment you received through Zelle was not for a job or any work-related service you provided, it likely falls under a category like a gift, personal loan, or non-taxable reimbursement. In general, you wouldn't need to report or file any tax forms for non-taxable transactions like gifts or personal loans. However, be sure to keep clear records of these transactions, in case you ever need to provide documentation in the future. If the transaction is indeed taxable, such as income from a side gig or freelance work, then you'd typically report it on Schedule C (Form 1040) or other appropriate forms based on your tax situation.