If you are not a W-2 employee, they should be issuing a 1099-NEC. If you have been working as self-employed, then you are responsible to pay your own taxes, social security, and Medicare taxes. If your employer changes you to a W-2 employee, then they would withhold taxes and pay their portion of social security and Medicare. Often that will mean that they will then pay you a reduced hourly rate. Discuss with your employer to see if that is something you both agree on.
