Unfortunately, looking up your EIN on IRS.gov isn't an option, as there's no EIN lookup tool. Still, that doesn't mean you're entirely out of luck. You can find it on the official IRS notice you received when it was issued, call the IRS directly or locate your EIN on business documents.

The IRS doesn't provide a public database you can use to look up EIN numbers for your own company or others. However, you can look at your EIN confirmation letter or other places your number may be recorded, including previously filed tax returns or old financing documents.

There are a couple of places that EIN verification lookup tools can draw information from. The most authoritative places are government websites, such as state Secretary of State portals, the SEC's EDGAR system (for companies listed on public stock exchanges), or the IRS itself (for charities and nonprofits).

More In Help. An employer identification number (EIN) is a nine-digit number assigned by the IRS. It's used to identify the tax accounts of employers and certain others who have no employees. The IRS uses the number to identify taxpayers who are required to file various business tax returns.