Where to look for your Tax ID Number

Your Tax ID Number is printed on documents you already have at home. The fastest way to find it is to check your most recent tax return, W-2 form, or 1099 form — the number appears in the top right corner of each. If you filed taxes last year, look in your email for the confirmation message from the IRS or your tax software; that message usually includes your Tax ID.

If you cannot find those documents, check your Social Security card. For most individual filers, your Tax ID is straightforward your Social Security Number (SSN). If you are self-employed or run a business, your Tax ID is an Employer Identification Number (EIN) instead, and that will not be on your Social Security card.

Bank statements and mortgage documents sometimes show your Tax ID as well, since lenders need it for reporting purposes. Look at any financial paperwork from the past year or two.

Key Takeaways

  • Your Tax ID Number appears on your most recent tax return, W-2, or 1099 form in the top right corner.
  • For individuals, your Tax ID is your Social Security Number; for businesses, it is an Employer Identification Number (EIN).
  • If you cannot locate a tax document, the IRS can confirm your Tax ID by phone or through your online account at IRS.gov.
  • You do not need to request a new Tax ID unless you have never had one or your situation has changed significantly.

Getting your Tax ID from the IRS directly

If you have looked through your documents and cannot find your Tax ID, you can contact the IRS directly. Call the IRS at 1-800-829-1040 during business hours (Monday through Friday, 7 a.m. to 7 p.m. your local time). Have your name, date of birth, and current address ready. The IRS representative will confirm your Tax ID over the phone.

You can also create an account on IRS.gov and log in to view your Tax ID. Go to IRS.gov, select "Sign in" in the top right, and follow the steps to set up an account using your Social Security Number or EIN. Once logged in, your Tax ID will be visible on your account dashboard.

The difference between SSN and EIN

If you work as an employee, your Tax ID is your Social Security Number. This is the nine-digit number on your Social Security card, formatted as XXX-XX-XXXX. You use this number on your personal tax return (Form 1040) and on W-2 forms your employer sends you.

If you own a business, work as a sole proprietor, or are self-employed, you may have an Employer Identification Number (EIN) in addition to your SSN. An EIN is a nine-digit number issued by the IRS specifically for business purposes. You use your EIN on business tax returns (Form 1120 for corporations, Schedule C for sole proprietors) and when hiring employees. You do not need an EIN unless your business has employees or is structured as a partnership, corporation, or LLC.

What to do if you have never had a Tax ID

If you have never filed taxes and do not have a Social Security Number, you will need to obtain one before you can file. Contact your local Social Security Administration office or visit ssa.gov to request a Social Security Number. The process takes several weeks.

If you are self-employed and have never had an EIN, you can request one from the IRS. Visit IRS.gov and use the online EIN process tool, which issues a number when ready. You can also explore by phone at 1-800-829-4933 (TTY 1-800-829-4059) or by mail using Form SS-4. The phone and online methods are faster than mail.

Using your Tax ID on forms and documents

Your Tax ID appears on nearly every tax-related document you receive or submit. On your personal tax return (Form 1040), it goes in the top right corner. On W-2 forms from your employer, it appears in Box a. On 1099 forms (for freelance income, interest, dividends), it is in the top left corner labeled "RECIPIENT'S TIN."

When you open a bank account, explore for credit, or sign up for certain services, you may be asked for your Tax ID. Banks use it to report interest income to the IRS. Credit card companies use it to report rewards or cash back. Always provide your correct Tax ID to avoid mismatches between what you report and what the IRS receives.

Protecting your Tax ID

Your Tax ID is sensitive information, similar to a password. Do not share it with people you do not trust, and do not post it on social media or unsecured websites. Scammers can use your Tax ID to file false tax returns in your name or open accounts fraudulently.

If you believe your Tax ID has been compromised, contact the IRS when ready at 1-800-829-1040. You can also file Form 14039 (Identity Theft Affidavit) with the IRS to report the issue. The IRS will flag your account and monitor it for suspicious activity.

Frequently Asked Questions

Is my Tax ID the same as my Social Security Number?

For most people, yes. Your Tax ID and Social Security Number are the same nine-digit number. However, if you own a business, you may have both an SSN and a separate EIN. The IRS uses whichever number matches the type of return you are filing.

Can I look up someone else's Tax ID?

No. Tax ID Numbers are private information protected by federal law. You cannot look up another person's Tax ID through the IRS or any public database. Only the person themselves, their employer (for W-2 purposes), or an authorized representative can access it.

What if I lost my Social Security card but know my number?

You do not need your physical Social Security card to use your Tax ID. The number itself is what matters for tax purposes. If you need a replacement card, contact the Social Security Administration, but for filing taxes you only need to know the number.

How long does it take to get an EIN?

If you explore online at IRS.gov, you receive your EIN when ready. If you explore by phone, you get it the same day. If you mail Form SS-4, allow four to six weeks. Online and phone are much faster if you need the number right away.

Do I need a Tax ID if I am not working?

If you have no income, you do not need to file taxes or have a Tax ID. However, if you have any income at all — even from a small freelance job or interest in a savings account — you should have a Tax ID and may need to file a return.