What is a state tax ID number, and what is it for? A state tax ID number is sometimes called a state employer ID, state EIN or state tax registration. It’s assigned by a state to identify a business ...

If you need a federal ID number for your business, you find it through the IRS website. Known as an employer identification number, EIN or tax identification number, it identifies your company to the ...

Tax-identification numbers are required on all tax forms, including tax returns. The number is how your business is identified by the IRS. The tax-identification number for your business can be either ...