how long is a tax id number
The IRS uses this number for your business the way it uses a Social Security Number (SSN) for individuals. The IRS uses your business EIN to identify your tax returns, business tax account, and documents. The EIN is the taxpayer identification number for businesses â it appears on all your business federal tax filings. CT Tip: Some states require a separate State Tax ID number; other states use the Federal Tax ID number. The IRS calls a business Tax ID number an âEmployer Identification Number,â or EIN. CT Tip: Both your individual SSN and your business EIN are nine digits. But SSNs (and ITINs) take the form 123-45-6789. In contrast, EIN numbers take the form 12-3456789.