What Is a Tax ID Number?
A Tax ID Number is a unique identifier used by the IRS for tax tracking purposes. There are two main types:
- EIN (Employer Identification Number): For businesses, trusts, estates, and nonprofit organizations.
- SSN (Social Security Number) or ITIN (Individual Taxpayer Identification Number): For individuals, including sole proprietors.
How Do You Find Your Tax ID Number?
1. Look at IRS Confirmation Letters
If your business has applied for an EIN, you received a CP 575 confirmation letter from the IRS. This letter contains your EIN and serves as your official certificate.
2. Check Tax Returns and Financial Documents
Your EIN or TIN will be listed on:
- Filed tax returns (Form 941, 1120, 1040 with Schedule C, etc.)
- Business bank account statements
- Payroll documents
- Previous IRS notices and correspondence
3. Contact Your Bank or Financial Institution
If you’ve used your EIN to open a business bank account or apply for credit, your bank can typically provide a copy of your EIN upon request.
4. Call the IRS Business & Specialty Tax Line
If you can’t locate your EIN, call the IRS at:
- 1-800-829-4933 (Business & Specialty Tax Line)
- Hours: Monday to Friday, 7 a.m. to 7 p.m. (local time)
Only the business owner or an authorized representative can request EIN information. Be prepared to verify your identity.
5. For Individuals: Check Your SSN or ITIN
If you’re a sole proprietor using your SSN or ITIN as your TIN:
- Check your Social Security card or ITIN letter
- Review past tax returns or W-2s
- Contact the IRS if you’ve lost your SSN/ITIN documentation
What If You Never Had a Tax ID?
If you don’t have a TIN yet:
- Apply for an EIN via the IRS EIN Online Assistant (free and instant for most businesses)
- Apply for an ITIN or SSN via IRS Form W-7 or through the SSA, respectively
Final Thoughts
So, how do you find your tax ID number? Start with your existing IRS documents, bank records, or contact the IRS directly. Keeping your TIN secure and accessible is vital for financial, legal, and operational purposes.
