DoninGA is correct that you have to report all your 2023 income on your 2023 tax return. If you are employed, then your employer normally asks you to fill out a W-4 so that the employer will know how much to withhold. This is done because the US tax system is a pay-as-you go system, that is, you should be paying tax at least every quarter.
Do you know why your employer did not withhold any tax?
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