Whether you’re filing taxes, applying for a loan, or completing business paperwork, you may be asked for your Tax Identification Number (TIN). But what if you don’t remember where to find it?
Here’s a step-by-step guide to help you find your tax ID number—whether you’re an individual or a business owner.
What Is a Tax ID Number?
A Tax Identification Number (TIN) is used by the IRS to identify individuals and entities for tax purposes. There are different types of TINs:
- Social Security Number (SSN) – for individuals
- Employer Identification Number (EIN) – for businesses
- Individual Taxpayer Identification Number (ITIN) – for certain non-residents and others who don’t qualify for SSNs
How to Find Your Tax ID Number as an Individual
If you’re an individual looking for your SSN or ITIN:
1. Check Your Official Documents
Your SSN or ITIN can usually be found on:
- Social Security card
- Past tax returns (e.g., 1040 form)
- W-2 or 1099 forms
- ITIN assignment letter from the IRS
2. Call the IRS (For ITIN Only)
If you’ve lost your ITIN and can’t find your IRS letter, call the IRS at 1-800-829-1040 for assistance.
How to Find Your Business Tax ID Number (EIN)
If you own a business, your Employer Identification Number (EIN) serves as your tax ID number. Here’s how to find it:
1. Look at IRS Documents
Check for your:
- EIN Confirmation Letter (CP 575)
- IRS Form 147C (you can request this by calling 1-800-829-4933)
- Previous business tax returns (e.g., Form 1120 or 1065)
- EIN used on W-2s or 1099s issued by your business
2. Check with Your Bank or State
If you used your EIN to open a business bank account or register your LLC or corporation with the state, they may have a record of your EIN.
3. Call the IRS
If you still can’t locate it, call the IRS Business & Specialty Tax Line at 1-800-829-4933. Be ready to verify your identity.
Can I Look Up Someone Else’s Tax ID Number?
No. Tax ID numbers are not public information unless the business is a nonprofit. In those cases, EINs may appear on IRS Form 990s, which are public records.
Final Thoughts
How do I find my tax ID number?
It depends on whether you’re an individual or business. Start with your tax records, documents from the IRS, or contact the IRS directly if needed. Having this number handy ensures smooth tax filing, banking, and compliance.
