ITIN vs SSN: The Differences Explained

The ITIN (Individual Taxpayer Identification Number) is issued by the IRS so you can file your taxes and meet your tax obligations, regardless of immigration status. The SSN (Social Security Number) is issued by the Social Security Administration; it authorizes you to work legally in the U.S. and opens access to Social Security, Medicare and other federal benefits.

Neither replaces the other: each answers a different need. That’s why it’s common to hold an ITIN for years, then obtain work authorization or residency, and switch to an SSN. Here’s the full comparison.

Side by side

ITIN vs SSN, side by side

The key facts, so you know exactly what each number does — and which one you need.

	ITIN	SSN
What it is	Individual Taxpayer Identification Number	Social Security Number
Who issues it	The IRS	The Social Security Administration (SSA)
What it’s for	Filing taxes and meeting your obligations with the IRS, regardless of immigration status	Working legally and identifying yourself to the U.S. government for federal benefits
Work authorization	Does not authorize employment in the U.S.	Does (when issued for that purpose)
Taxes	Lets you file your return even without an SSN	Lets you file your return
Credit	Yes — the credit bureaus accept it to open your file and build your score	Yes — the number most widely accepted by banks and bureaus
LLC	Yes — you can form your Texas LLC and get your EIN with an ITIN	Yes — you can form your Texas LLC with your SSN
Bank account	Yes — most U.S. banks accept it to open an account	Yes — accepted at practically every bank

Common myths

What you CAN do with an ITIN — even if most people think you can’t

The ITIN doesn’t authorize work, but it opens more doors than most people expect.

Open a bank account

Most U.S. banks accept an ITIN to open a checking or savings account.

Build a credit history

The credit bureaus (Experian, Equifax, TransUnion) accept the ITIN to open your file and build your score.

Get a credit card

Select banks and issuers offer cards to ITIN holders — some starting with your first account with them.

Form your LLC and get an EIN

Texas doesn’t require an SSN to register a business, and the IRS assigns your company an EIN using your ITIN.

File jointly

If your spouse has an SSN, you can file Married Filing Jointly even while you hold an ITIN.

Apply for loans, including a mortgage

Some lenders work specifically with ITIN holders on personal, auto and home loans.

The transition

Can you switch from an ITIN to an SSN?

Yes. If you get an SSN after using an ITIN — through residency or work authorization, for example — the switch is not automatic: you have to tell the IRS in writing.

Send the IRS a letter asking them to combine your records, with a copy of your Social Security card and, if you kept it, your original ITIN assignment letter (CP565).
Your past filing history gets linked to your new SSN.
Your ITIN goes inactive — don’t use it on future returns.
The credit history you built with the ITIN generally transfers once you update your information with the bureaus and your creditors.

Frequently asked

ITIN and SSN questions, answered

Does my ITIN help me get an SSN later?

Not directly — they are separate processes, and an ITIN neither speeds up nor is required for an SSN. When you qualify for one (for example, through residency or work authorization), you apply with the Social Security Administration like anyone else. What does carry over is your history: once you tell the IRS you have an SSN, your ITIN goes inactive and your tax history is linked to the new number.

Can my U.S.-born children use an ITIN?

They don’t need one. Anyone born in the U.S. is a citizen automatically and can get an SSN from birth — usually arranged right at the hospital along with the birth certificate. The ITIN exists only for people who don’t qualify for an SSN.

Do I need an ITIN or an SSN for Obamacare?

The federal Marketplace (Obamacare/ACA) generally requires an SSN or an eligible immigration status to enroll the policy holder — an ITIN alone is not enough. In mixed-status families, though, the eligible members (for example, children with SSNs) can enroll even if you hold an ITIN, and some carriers sell private plans without asking for an SSN. See health insurance →

Does my ITIN work for a Texas driver license?

No — the ITIN is not a document the Texas DPS accepts for a driver license. That process requires proving identity and, in most cases, lawful presence — an ITIN alone doesn’t meet the requirement. For what applies to your specific situation, the Texas DPS is the official source.

What if my ITIN is stolen?

Report it to the IRS with Form 14039 (Identity Theft Affidavit), and place a fraud alert or freeze on your credit file with the three bureaus. If you suspect someone filed a tax return using your ITIN without your consent, contact the IRS immediately. We walk you through the process and amend your return if it was affected.

Keep exploring

Everything related to your ITIN

Still not sure which one you need?

Tell us your situation and we’ll point you the right way — free, no commitment. And if the answer is an ITIN, we file it as IRS Certified Acceptance Agents, with your passport never going to the government.

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ITIN vs SSN: what’s the difference