Tax Forms W-4 Forms   When hiring new employees you will need to have them fill out a W-4 form. W-9 Form   If you have a subcontractor or pay a person casual labor they will need to fill out a W-9 form. EIN   Are you starting a new business or starting payroll? You will need an employer identification number. This link will take you to the application or feel free to call the office and we can assist you.