A common question for entrepreneurs, researchers, and vendors is: “Can I look up a tax ID number?” The short answer is yes—but with limitations. A Tax ID Number (also called an Employer Identification Number or EIN) is used by the IRS to identify businesses for tax purposes.
Let’s break down how and where you can search for this number legally.
Ways to Look Up a Tax ID Number
1. For Your Own Business
If you lost your EIN:
- Check your IRS confirmation letter (CP 575)
- Review your tax filings or bank account documents
- Call the IRS Business Line at 800-829-4933
2. For Nonprofit Organizations
Yes, you can look up nonprofit EINs through the:
- IRS Tax Exempt Organization Search: apps.irs.gov/app/eos
- Public 990 tax return databases
3. For Other Businesses
Generally, business EINs are not fully public, but you might find them via:
- Secretary of State websites (some list business IDs)
- Commercial databases like Dun & Bradstreet or EIN Finder
- SEC filings (for publicly traded companies)
4. Use Form 4506-T (Advanced)
You can request tax transcripts using this form—but it only works for your own business or with consent.
Important Legal Notes
- You cannot freely look up individual or private company EINs without proper authorization.
- Be cautious of unofficial websites claiming to provide EINs—they may not be legitimate.
Conclusion
Can I look up a tax ID number? Yes, but it depends on whose number you’re trying to find. For your own or nonprofit organizations, it’s simple. For private companies, you’ll need to rely on legal, verified sources.
