The commission payment you received is earned income. Since you are no longer employed by the company that paid you, they reported it on Form 1099-NEC. Unless you can get your former employer to issue a corrected 1099-NEC with a zero amount paid and issue you a W-2, you will have to report it as self-employment income. If you had been paid as an employee and the payment reported on a W-2, you would have had Social Security and Medicare tax withheld. Self-Employment tax is basically both the employee and the employer's part of social security and Medicare. If you have any expenses you can allocate to that income, you can deduct them on Schedule C.
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