If you’ve ever filled out a tax form or applied for a business license, you’ve likely encountered the term TIN. But many people still wonder, “what is my TIN?” and where they can find it.
In this article, we’ll break down what a Tax Identification Number (TIN) is, the different types, and how to locate yours—whether you’re an individual, business owner, or nonresident.
What Is a TIN?
A Tax Identification Number (TIN) is a unique number used by the IRS and other tax authorities to track your tax obligations and identity. It’s required for filing taxes, opening financial accounts, and interacting with federal or state tax agencies.
Types of TINs in the U.S.
Depending on your status, your TIN might fall under one of these categories:
1. Social Security Number (SSN)
Used by U.S. citizens and permanent residents for individual tax filing.
2. Employer Identification Number (EIN)
Used by businesses, LLCs, and nonprofits to file taxes and handle payroll.
3. Individual Taxpayer Identification Number (ITIN)
Issued to non-U.S. residents and others who don’t qualify for an SSN.
4. Adoption Taxpayer Identification Number (ATIN)
Used for children being adopted who do not yet have an SSN.
What Is My TIN? How to Locate It
For Individuals:
- Your TIN is usually your SSN.
- You can find it on your:
- Social Security card
- W-2 form
- Tax returns (Form 1040)
For Business Owners:
- Your TIN is your EIN.
- Find it on:
- IRS EIN Confirmation Letter (CP 575)
- Business tax returns
- IRS Form 147C (request copy by calling the IRS)
For Nonresidents:
- Your TIN is your ITIN, issued on IRS Notice CP565.
- Find it on tax filings or the original IRS letter.
Why Is Your TIN Important?
Your TIN is used for:
- Filing federal and state taxes
- Applying for loans or bank accounts
- Hiring employees
- Receiving tax benefits or credits
- Filing information returns (e.g., Form 1099)
What If I Lost My TIN?
If you lost your TIN:
- SSN: Contact the Social Security Administration (SSA)
- EIN: Call the IRS Business Line at 800-829-4933
- ITIN: Call the IRS at 800-829-1040
Never share your TIN publicly, as it’s sensitive and can be used for identity theft.
Final Thoughts
So, what is my TIN? Your TIN could be an SSN, EIN, or ITIN depending on your status. It plays a critical role in your financial and legal identity, especially when dealing with the IRS or government institutions.
Make sure you store your TIN securely, and know which type applies to you or your business.
