What is a tax ID number? It's a unique nine-digit number issued by the Social Security Administration or the IRS to anyone who pays taxes. Learn more here.

Ever tried filing taxes, opening a U.S. bank account, or applying for a loan and hit a wall because you don’t have a Social Security Number? That’s where a taxpayer identification number (or TIN) can ...

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 ...

Julia Kagan is a financial/consumer journalist and former senior editor, personal finance, of Investopedia. Pete Rathburn is a copy editor and fact-checker with expertise in economics and personal ...

An EIN, also called a federal identification number, is a unique business tax ID number that you can get online in just a few minutes. Many, or all, of the products featured on this page are from our ...

Julia Kagan is a financial/consumer journalist and former senior editor, personal finance, of Investopedia. Mira Norian / Investopedia A bank identification number (BIN) is the initial set of four to ...