If you were performing work for a company and they reported your income on a Form 1099-NEC, then that company considered you to be an independent contractor and not their employee. As an independent contractor your income reported on Form 1099-NEC will need to show up on a Schedule C Business Income and Expenses.
Being an independent contractor for the work you did means that you are considered to be self-employed in the eyes of the IRS and your income (and expenses, if any) should be reported on Schedule C.
See the following for some additional information:
What is a 1099-NEC?
Am I considered self-employed?
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