You need to find out how the employer is reporting that income to you.
Could be either a W-2, or a 1099-NEC, depending on whether or not they were treating you as an actual employee, or an independent contractor.......and in either form, the tax withholding could and should be reported on that form, if the employer is operating correctly.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
