What is a tax ID number? A tax ID number is a unique nine-digit number issued by the Social Security Administration or the Internal Revenue Service to anyone who pays taxes. Read More: Owe Money to ...

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 run a home business or you have self-employment income, you may at some point need an employer identification number. This need may arise when you hire employees, or when you want to open a ...