Your tax ID is on documents you already have at home

Your tax ID number — either your Social Security number or Employer Identification Number — appears on several documents you receive from the government or your employer. You do not need to request it or contact anyone. The fastest way to find it is to check your most recent tax return, a W-2 form, or a bank statement. If you have filed taxes before, the IRS has your number on file.

If you have never filed taxes and do not have these documents, you can request a replacement Social Security card from the Social Security Administration or contact the IRS directly. Both processes take a few weeks, so plan ahead if you need the number for a important date.

Key Takeaways

  • Your Social Security number appears on your most recent tax return, W-2 form, 1099 form, or bank statement.
  • If you are self-employed or own a business, your Employer Identification Number is on IRS correspondence, business bank statements, or your business tax returns.
  • The Social Security Administration can issue a replacement card with your number if you have lost all documents that show it.
  • The IRS can confirm your tax ID number if you call their automated line or visit a local office with proof of identity.

Finding your Social Security number on documents at home

Your Social Security number is printed on several documents you likely have in a file or drawer. Check your most recent federal tax return first — the number appears in the top-left corner of Form 1040 or whichever form you filed. If you filed jointly with a spouse, both numbers are listed.

If you do not have a recent return, look for a W-2 form from your employer. This form, which shows your annual wages and taxes withheld, displays your Social Security number in the top-left box. You should receive a W-2 by January 31 each year if you were employed. If you were self-employed or had other income, check for a 1099 form instead — the number appears in the same location.

Bank statements, investment account statements, and retirement account statements (like 401k or IRA statements) also show your Social Security number. Any official financial document from a bank or brokerage will have it printed on the first page or in the account information section.

Finding your Employer Identification Number if you own a business

An Employer Identification Number (EIN) is a nine-digit number the IRS assigns to businesses, partnerships, and certain trusts. If you own a business or are self-employed, you may have an EIN separate from your Social Security number. This number appears on business tax returns (Form 1120, 1120-S, or 1065), business bank statements, and any IRS correspondence sent to your business address.

Check your business tax returns first. The EIN is listed at the top of the form. If you have business bank statements, the EIN usually appears on the first page or in the account details section. The IRS also sends a letter (Form SS-4) when it assigns an EIN — if you kept this letter, the number is clearly displayed.

If you cannot find these documents, you can contact the IRS Business and Specialty Tax Line at 800-829-4933 to request your EIN. Have your business name, address, and date of birth ready. The IRS can confirm the number over the phone.

Requesting a replacement Social Security number from the Social Security Administration

If you have lost all documents showing your Social Security number and cannot locate it, you can request a replacement Social Security card from the Social Security Administration. You will need to visit a local Social Security office in person — you cannot request a card by mail or phone.

Bring a government-issued photo ID (such as a driver's license or passport) and proof of citizenship or legal residency (such as a birth certificate or naturalization papers). The office will verify your identity and issue a new card with your existing number printed on it. The card typically arrives by mail within two weeks.

To find your nearest Social Security office, visit ssa.gov and use the office locator tool, or call 800-772-1213. Some offices accept walk-ins, but many now require an appointment. Check the office's website or call ahead before you go.

Contacting the IRS to confirm your tax ID number

The IRS has your tax ID number on file if you have ever filed a federal tax return. You can confirm your number by calling the IRS directly or visiting a local IRS office. The IRS Automated Phone System at 800-829-1040 can verify your Social Security number if you have your return from the previous year available.

If you prefer to speak with a person, call the same number and select the option to speak with a representative. Wait times are often long, especially during tax season (January through April). Have your name, address, date of birth, and any recent tax documents ready when you call.

You can also visit an IRS office in person. Use the IRS office locator at irs.gov to find the nearest location. Bring a government-issued photo ID and any tax documents you have. Walk-ins are accepted, but arriving early in the morning reduces wait times.

What to do if you have never filed taxes and have no documents

If you have never filed a tax return and do not have a Social Security number, you must first obtain one from the Social Security Administration. Visit a local Social Security office with your birth certificate, proof of citizenship or legal residency, and a government-issued photo ID if you have one. The office will assign you a number and issue a card.

If you were born outside the United States, you will also need to show proof of legal residency, such as a green card or visa. The process takes about two weeks from the date you explore. Once you receive your card, your number is active when ready and can be used for tax purposes, employment, and financial accounts.

Frequently Asked Questions

Can I find my tax ID number online?

You cannot look up your Social Security number or EIN through a public online tool. The IRS does not provide an online lookup service. Your best option is to check documents at home or call the IRS at 800-829-1040 to confirm your number over the phone.

Is my Social Security number the same as my tax ID?

For most people, yes — your Social Security number is your tax ID. However, if you own a business, you may have both a Social Security number and a separate Employer Identification Number. The IRS uses whichever number matches the type of return you file.

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

You do not need to replace the card if you remember the number. The card itself is just proof of the number — the number itself does not expire or change. You only need a replacement card if you need to show it to an employer or financial institution.

How long does it take to get a replacement Social Security card?

A replacement card typically arrives by mail within two weeks of your visit to a Social Security office. Some offices offer expedited service for an additional fee. Call your local office to ask about faster options if you need the card urgently.

Can someone else pick up my Social Security card or tax ID information?

No. The Social Security Administration will only issue a card to the person whose name is on it. You must visit the office in person with your own ID. The IRS will only confirm your tax ID to you directly, not to a third party.