ITIN vs SSN: What Each Number Actually Lets You Do
Both are nine digits and both go in the same box on a tax form. What they get you is not remotely the same — and two of the differences moved in 2026. This is the version without the blurring.
Every rule on this page is cited to an IRS source, linked where it is used. Last read against those sources September 9, 2026.
An SSN is issued by the Social Security Administration, works across the whole federal system, and never expires. An ITIN is issued by the IRS, works only for federal tax administration, and expires after three consecutive years off a tax return. Both let you file a return and receive a refund. The Earned Income Tax Credit needs an SSN valid for employment for everyone on the return; the Child Tax Credit and the education credits are household tests, met on a joint return if one spouse holds the required SSN. Only an SSN builds Social Security entitlement. Neither one is work authorization, and neither one changes immigration status.
Key takeaways
- You cannot choose between them. An ITIN is only issued to someone who is not eligible for an SSN. If you can get an SSN, that is your number.
- The gap is in the credits, not the filing. Filing works identically. What you can claim on the return does not.
- The gap widened in 2026 — unevenly. Both education credits, and the new tips, overtime and senior deductions, gained their own Social Security number conditions. The car loan interest deduction did not; it turns on the vehicle, the loan and the VIN.
- An ITIN is not identification. Banks and states may accept one; that is their policy and it can change.
- An ITIN expires. An SSN does not. That single asymmetry catches people who skip a few filing years.
The short answer
| SSN | ITIN | |
|---|---|---|
| Issued by | The Social Security Administration | The Internal Revenue Service |
| Who it is for | U.S. citizens, permanent residents, and non-citizens with work authorization | People with a federal tax reason who are not eligible for an SSN |
| Format | Nine digits; the first digit is never 9 | Nine digits, 9XX-XX-XXXX — always begins with 9 |
| What it is for | Tax, employment, benefits, and identification across the federal system | Federal tax administration only |
| Expires? | Never | Yes — after three consecutive years off a federal return |
| Cost | Free | Free from the IRS; a private agent may charge a fee |
| Can you hold both? | Not legitimately — an ITIN is only for those who cannot get an SSN | If you later receive an SSN, the ITIN is voided and the records merged |
The full capability matrix
Thirteen rows, each answered plainly. Three of them have an honest “no” in the SSN column too, which is the part comparison pages usually leave out.
| Can you… | With an SSN | With an ITIN | The detail that matters |
|---|---|---|---|
| File a federal tax return | Both work. This is the entire purpose of an ITIN. | ||
| Receive a federal refund you are owed | A refund is not a benefit — it is your own overpaid money coming back. | ||
| Be claimed as a spouse or dependent | An ITIN works only where the tax benefit being claimed allows it. Since 2018 the IRS will not issue one to a spouse or dependent otherwise. | ||
| Claim the Child Tax Credit | On a joint return only one spouse needs an SSN valid for employment; the other may hold an ITIN issued by the due date. Each qualifying child still needs their own SSN valid for employment, so a child holding an ITIN never qualifies. | ||
| Claim the $500 Credit for Other Dependents | The dependent may hold an ITIN. | ||
| Claim the Earned Income Tax Credit | Stated directly on the IRS ITIN page. | ||
| Claim an education credit | Changed for tax years beginning after December 31, 2025: you or your spouse if filing jointly, and the student if the student is your dependent, need an SSN valid for work. One qualifying SSN on the taxpayer side is enough. | ||
| Claim a tax-treaty rate on U.S. income | One of the listed reasons for applying. | ||
| Work legally in the United States | An SSN alone is not work authorization either — the authorization comes from your immigration status. But an ITIN never confers it. | ||
| Earn Social Security or Medicare credits | The IRS states an ITIN does not qualify you for Social Security benefits. | ||
| Change or support an immigration status | Neither number does this. Any service claiming otherwise is selling you something. | ||
| Serve as identification outside the tax system | The IRS says explicitly that an ITIN does not serve as identification outside the federal tax system. | ||
| Expire from non-use | An SSN never expires. An ITIN expires on December 31 after the third consecutive tax year it goes unused on a federal return. |
Source: IRS — Individual taxpayer identification number (ITIN), read September 8, 2026. Credit rows cross-checked against the IRS Child Tax Credit page and P.L. 119-21.
Who issues each, and how to tell them apart
An ITIN is written to look like a Social Security number on purpose: it has to fit the same nine-digit box on a Form 1040 and a Form 1099. But the numbering is distinguishable.
- An ITIN always begins with 9, and the fourth and fifth digits fall in one of these bands: 50-65, 70-88, 90-92, 94-99.
- A leading 9 rules out a Social Security number — the Social Security Administration has never issued an SSN beginning with 9 — but it does not by itself establish that the number is an ITIN. It is the quickest elimination test, not a positive one — the 9 series also carries Adoption Taxpayer Identification Numbers (middle digits 93) and numbers the IRS assigns internally, so check the middle pair too.
- Neither number is issued with a card that says which it is, apart from the Social Security card itself. Your ITIN arrives on an IRS notice, not a card — the CP565.
Source: IRS Publication 4757 — Individual Taxpayer Identification Number (ITIN), read September 8, 2026.
Work authorization: the question behind the question
“Can I work with an ITIN?” is one of the most-searched questions on this topic, and it usually hides a different question. Two things are being confused, so it helps to separate them.
| The question | The answer | Who decides |
|---|---|---|
| Does an ITIN give me permission to work? | No. The IRS says an ITIN does not authorize you to work legally in the U.S., and does not provide or change immigration status. | Immigration law, not the IRS |
| Does an SSN give me permission to work? | Not by itself either. Some Social Security cards are annotated 'not valid for employment'. The authorization comes from your status; the number just records it. | Immigration law, not the SSA |
| If I have U.S. income, do I have to report it? | Yes. The obligation to report income and pay tax on it does not depend on how the income was earned or on your immigration status. | The Internal Revenue Code |
Source: IRS — Individual taxpayer identification number (ITIN), read September 8, 2026.
Credits and deductions — where the money actually is
Filing is identical. What you can claim on the return is not, and this is where the difference becomes a number in dollars.
| Credit or deduction | Available with an ITIN? | Amount | The test, and what it turns on |
|---|---|---|---|
| Child Tax CreditCHANGED | Up to $2,200 per qualifying child | You — or, on a joint return, at least one spouse — must have a Social Security number valid for employment. The other spouse may hold an ITIN, issued by the return's due date. Each qualifying child must separately have an SSN valid for employment, issued before the due date of the return. So an ITIN spouse does not by itself end the credit: if the other spouse holds an SSN valid for employment and the children hold theirs, the credit survives on a joint return. It is only lost when nobody on the return has the required SSN. A child with an ITIN never qualifies for this credit, whatever the parents hold. | |
| Credit for Other Dependents | $500 per dependent | The dependent must have a Social Security number, an ITIN, or an ATIN. There is no SSN-valid-for-employment condition on the dependent. This is the one that still works with an ITIN, and it is what a dependent's ITIN is usually worth. It starts to phase out above $200,000 of adjusted gross income. | |
| Earned Income Tax Credit | — | Everyone on the return — filer, spouse and any qualifying child — needs a Social Security number valid for employment. The IRS states plainly that an ITIN does not qualify you for the Earned Income Tax Credit. Unlike the Child Tax Credit there is no one-spouse-is-enough rule here, so a single ITIN on the return closes it. | |
| American Opportunity CreditCHANGED | Up to $2,500 per student | For tax years beginning after 31 December 2025: you, or your spouse if you file jointly, and the student if the student is your dependent, must have a Social Security number valid for work, issued before the due date of the return including extensions. Read the 'or' and the 'and' literally. On a joint return one spouse's valid-for-work SSN satisfies the taxpayer half of the test. The student half is separate, and only bites where the student is your dependent — a student claiming the credit on their own return is the taxpayer. | |
| Lifetime Learning CreditCHANGED | Up to $2,000 per return | The same test, from the same date: you, or your spouse if filing jointly, and the student if the student is your dependent, must have a Social Security number valid for work issued before the return's due date including extensions. Before 2026 an ITIN supported both education credits. It no longer does on its own — but a household is not automatically shut out either, because one qualifying SSN on the taxpayer side is enough. | |
| Child and Dependent Care Credit | Varies with expenses and income | No SSN-valid-for-employment condition applies to the filer. The qualifying person and the care provider must be identified on the return. This credit does not carry the test the Child Tax Credit does, so an ITIN filer can generally claim it if the ordinary rules are met. | |
| Standard deduction and itemised deductions | Varies | No identification-number test. The test is residency status for tax purposes. A resident-alien ITIN filer takes the standard deduction like anyone else. A nonresident filing Form 1040-NR generally cannot, and itemises a narrower list instead. Which number you hold is irrelevant here. | |
| Deduction for qualified tips (Schedule 1-A)CHANGED | Up to $25,000 | The taxpayer, or the spouse, who received the qualified tips must have a Social Security number valid for employment. A married taxpayer must file jointly to claim it. The condition attaches to the person who earned the tips, not to the return as a whole. Tips earned by an ITIN holder cannot be deducted; tips earned by a spouse who holds an SSN valid for employment can be, on a joint return. | |
| Deduction for qualified overtime (Schedule 1-A)CHANGED | Up to $12,500 ($25,000 on a joint return) | The taxpayer, or the spouse, who received the qualified overtime compensation must have a Social Security number valid for employment. A married taxpayer must file jointly. Same structure as the tips deduction: the test follows the earner. Overtime earned by an ITIN holder does not qualify, even on a joint return with an SSN spouse. | |
| Additional deduction for seniors (Schedule 1-A)CHANGED | Up to $6,000 per qualifying individual | Each taxpayer claiming the deduction must have a valid Social Security number. On a joint return each spouse claiming it must have one. A married taxpayer must file jointly. It is claimed per person, so it is decided per person. A 68-year-old with an SSN filing jointly with an ITIN spouse can claim their own; the ITIN spouse cannot claim theirs. | |
| Qualified passenger vehicle loan interest (Schedule 1-A)CHANGED | Up to $10,000 of interest | There is no Social Security number condition on this deduction. What it requires instead is the vehicle identification number of the vehicle, reported on Schedule 1-A, plus the loan and vehicle conditions: the loan originated after 31 December 2024, is secured by a first lien on the vehicle, and was used to buy a new personal-use passenger vehicle whose final assembly took place in the United States. An income phase-out applies. Separately, it turns on residency status: the IRS states that nonresident aliens are generally not eligible for this deduction, and the Instructions for Form 1040-NR were revised to remove it. This row is the reason a blanket 'all four new deductions need an SSN' statement is wrong, and it is wrong in both directions. There is no SSN condition here — the VIN is the identifying requirement, and it is also how final assembly in the United States is established. But an ITIN filer still has to clear a different test: a resident alien for tax purposes can claim the deduction on the ordinary rules, while a nonresident alien filing Form 1040-NR generally cannot. The Treasury and IRS final regulations (T.D. 10054, published 8 September 2026) set out the vehicle and loan conditions, and add information reporting by lenders who receive $600 or more of interest on a specified vehicle loan in a calendar year. |
Source: IRS — Education credits: AOTC and LLC, read September 9, 2026. Child Tax Credit row from the IRS Child Tax Credit page; the Schedule 1-A rows from the IRS Schedule 1-A guidance and, for vehicle loan interest, the final regulations at T.D. 10054.
Both spouses hold SSNs valid for employment. The Child Tax Credit is available for both children. The American Opportunity Credit is available for the college student. The Earned Income Tax Credit is available if income qualifies.
One spouse holds an ITIN, the other an SSN. The Child Tax Credit survives — the rule asks that you or your spouse hold an SSN valid for employment, and each child hold one too. The Earned Income Tax Credit does not survive; it needs an SSN for everyone on the return.
Both spouses hold ITINs. The Child Tax Credit is gone, even though the children are U.S. citizens with Social Security numbers. What remains is the $500 Credit for Other Dependents per child, and generally the Child and Dependent Care Credit.
And one row that moves on a different axis. If the household paid interest on a qualifying car loan, the Schedule 1-A deduction for it carries no Social Security number condition, so it survives all three cases above on that test. What it requires instead is the vehicle identification number on the form and the vehicle and loan conditions behind it — and, separately, that the claimant is a resident rather than a nonresident for tax purposes, because the IRS states that nonresident aliens are generally not eligible for this deduction. For an ITIN household that is the question to settle: residency status, not which number is on the return.
Between the first case and the third, the difference across two children is the gap between two credits of up to $2,200 and two of $500. Run your own figures on the Family Tax Credit Finder and 2026 federal tax calculator — the interaction with income phase-outs is not something a table can capture.
Identification: a policy, not a right
The IRS lists four things an ITIN does not do, and the fourth is that it does not “serve as identification outside the federal tax system.” That sentence does a lot of work.
In practice, many banks will open an account against an ITIN, several states will issue a driver's licence against one, and some lenders will underwrite against one. All of that is real, and all of it is the institution's own policy. None of it is a right the number confers, and any of it can change without the tax rules changing at all. Plan on the number being a tax number; treat everything else as a bonus that particular institution offers.
Source: IRS — Individual taxpayer identification number (ITIN), read September 8, 2026.
And where does an EIN fit?
Three numbers get confused with each other. They are not interchangeable.
| Number | Belongs to | Issued by | Used for |
|---|---|---|---|
| SSN | A person | Social Security Administration | Tax, employment, benefits, identification |
| ITIN | A person | IRS | Federal tax filing only |
| EIN | A business entity | IRS | The entity's own returns, payroll, and information reporting |
A foreign national who owns a U.S. LLC typically needs two of these at once: an EIN for the company and an ITIN for themselves, because the company's profit flows onto their personal return. They are separate applications on separate forms, and getting the EIN does not get you the ITIN. If that is your situation, the self-employment tax calculator and the LLC tax calculator cover what the personal return then looks like.
Holding both, and switching over
You are not meant to hold both. If your status changes and the Social Security Administration issues you a number, you stop using the ITIN immediately — and you write to the IRS so the two records become one.
That letter is not optional housekeeping. Until the IRS merges them, wages and withholding reported under the old number sit in a record the IRS no longer associates with you, which is exactly how a refund goes missing. The full procedure, the address, and what happens to your earlier filing history are on from ITIN to SSN.
Going the other way — an SSN holder wanting an ITIN — does not happen. Eligibility for an SSN is a bar to an ITIN, not a preference.
Frequently asked questions
What is the difference between an ITIN and an SSN?
A Social Security number is issued by the Social Security Administration, works across the whole federal system, and never expires. An ITIN is issued by the IRS, works only for federal tax administration, and expires if it goes three consecutive years without appearing on a tax return. You cannot hold both legitimately — an ITIN is only for people who cannot get an SSN.
Can I work in the U.S. with an ITIN?
No. The IRS states that an ITIN does not authorize you to work legally in the United States. Work authorization comes from your immigration status, not from any tax number. An ITIN lets you report and pay tax on income; whether you were permitted to earn that income is a separate question decided by immigration law.
Is an ITIN a Social Security number?
No, though it is deliberately formatted like one so it fits the same fields on tax forms. An ITIN is nine digits written as 9XX-XX-XXXX, always starting with 9, with the middle two digits inside published ranges. An SSN can start with any digit other than 9 in that position.
Can I get a driver's licence or open a bank account with an ITIN?
Sometimes, but that is a policy of the state or the bank rather than a right the number confers. The IRS says explicitly that an ITIN does not serve as identification outside the federal tax system. Many banks accept one and several states accept one for a licence — but each institution sets its own rule and can change it.
Does having an ITIN help or hurt my immigration case?
The IRS states an ITIN neither provides nor changes immigration status. It is a tax number, issued for tax administration. Whether a filing history matters in any particular immigration process is an immigration question, not a tax one — ask a licensed immigration attorney or a DOJ-accredited representative, not a tax website.
Which credits can I claim with an ITIN but not an SSN, or the other way round?
There is nothing an ITIN reaches that an SSN does not. Going the other way is less uniform than most comparisons suggest. The Earned Income Tax Credit needs an SSN valid for employment for everyone on the return, with no exceptions — that one really is closed. The Child Tax Credit and both education credits are household tests: on a joint return one spouse's SSN valid for employment satisfies the taxpayer side, so an ITIN spouse does not end them, though each qualifying CTC child still needs their own SSN. Of the 2025-2028 Schedule 1-A deductions, tips, overtime and the senior deduction each carry their own SSN condition attached to the person concerned. The qualified passenger vehicle loan interest deduction carries no SSN condition at all — it turns on the vehicle, the loan and the VIN — but it does turn on residency: the IRS states that nonresident aliens are generally not eligible for it, so a resident-alien ITIN filer can reach it and a nonresident filing Form 1040-NR generally cannot. The $500 Credit for Other Dependents and generally the Child and Dependent Care Credit remain available.
What is the difference between an ITIN and an EIN?
An EIN is an Employer Identification Number, issued to a business entity — a company, partnership or LLC — so it can file its own returns and report payroll. An ITIN belongs to a person. A foreign owner of a U.S. business commonly needs both: an EIN for the entity, an ITIN for themselves. They are separate applications on separate forms.
If I get an SSN later, does my ITIN filing history transfer?
Only if you ask. The IRS asks you to write to it with your name, mailing address, ITIN, a copy of your Social Security card and a copy of your CP565 notice, so it can void the ITIN and associate everything filed under it with the SSN. Skip that letter and your earlier wages and withholding stay attached to a number the IRS no longer connects to you.
Work out what your situation costs
The difference between the numbers is only interesting as a figure on your own return. These are free, need no account, and run entirely in your browser.
- 2026 federal tax calculator — the whole return, including which credits apply.
- Family Tax Credit Finder — the credit questions above, answered against your household.
- Tax refund estimator — what comes back once the credits are settled.
- ITIN eligibility & document checker — if you are still deciding whether you need one at all.