ITIN Number: What It Is, Who Needs One, and the 2026 Rules
An ITIN is the number the IRS gives you so you can file a federal tax return when you cannot get a Social Security number. Here is who needs one, what it does and does not get you, and exactly how to apply — written by a Chartered Accountant with nothing to sell you.
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 ITIN (Individual Taxpayer Identification Number) is a nine-digit number the IRS issues to people who need a U.S. taxpayer number but cannot get a Social Security number. It is formatted like an SSN and always starts with 9. You apply on Form W-7, usually attached to the tax return the number is for, and the IRS asks you to allow 7 weeks — or 9–11 weeks during January 15 through April 30 — to be told the outcome. An ITIN lets you file and be paid a refund. It does not give you work authorization, immigration status, Social Security benefits, or identification outside the tax system.
Key takeaways
- Only apply if you cannot get a Social Security number. The IRS will not issue an ITIN to someone who is eligible for an SSN, and that single test decides most applications before they are written.
- The number and the return travel together. Your Form W-7 goes in the same envelope as the tax return it is for, on paper. Five narrow exceptions let you apply without one.
- A passport is the only stand-alone document. Everything else has to be paired — one document proving identity, one proving foreign status.
- Applying in person is free and keeps your passport. The free-by-mail route is the one that puts your original passport in the postal system for two months.
- What an ITIN gets you narrowed in 2026 — but not uniformly. The education credits, and the new deductions for tips, overtime and seniors, each gained their own Social Security number condition. The car loan interest deduction did not: it turns on the vehicle, the loan and the VIN. Older guides get both halves of this wrong.
What an ITIN is, in one paragraph
The U.S. tax system runs on numbers, not names. Every return has to be filed against a taxpayer identification number so the IRS can match income reported by employers and banks to the person who owes tax on it. Most people use a Social Security number. But there are millions of people with a genuine U.S. tax obligation who cannot get one — a foreign investor with U.S. rental income, a spouse living abroad, a researcher on a visa that does not permit work. The ITIN exists to fill that gap, and nothing else.
In the IRS's own words, “an ITIN is a 9-digit number the IRS issues if you need a U.S. taxpayer identification number for federal tax purposes, but you aren't eligible for a Social Security number.” The last clause is the one that matters. It is a condition, not a description.
Source: IRS — Individual taxpayer identification number (ITIN), read September 8, 2026.
Do you actually need an ITIN? Follow the tree
Four questions settle it for almost everyone. Read down; each branch either ends in an answer or sends you to the next question.
- Do you have a Social Security number, or could you get one?
- Yes / maybeYou do not need an ITINApply to the Social Security Administration instead. The IRS will not issue an ITIN to anyone who is eligible for an SSN, and an application that says otherwise is rejected. If you already have an SSN, use it — never both.
- NoGo to question 2.
- Yes / maybe
- Do you have a federal tax reason for needing a number this year?
- NoYou do not need an ITINAn ITIN is issued for a federal tax purpose, not on request. With no return to file, no income being reported to you, and nobody claiming you, there is nothing for the IRS to issue a number against. Apply in the year the reason appears.
- YesGo to question 3 to find which reason it is.
- No
- Which reason describes you?
- AYou need an ITINYou must file a U.S. return yourself. You are a nonresident with U.S. income, or you meet the substantial-presence test and file as a resident. Apply with the return attached.
- BYou need an ITINSomeone is claiming you as a spouse or dependent for a tax benefit they are allowed to claim. Since 2018 that condition matters: no allowable benefit, no ITIN. A dependent also has to prove U.S. residency, unless the passport carries a U.S. entry date, the dependent belongs to a U.S. military family stationed overseas, or the dependent is from Canada or Mexico and is claimed for an allowable benefit other than the Credit for Other Dependents.
- CYou need an ITINA U.S. payer has to report money to you or withhold on it — bank interest, dividends, rent, royalties, a scholarship, a property sale, or mortgage interest you paid. These are the exceptions, and most of them let you apply without attaching a return.
- DIt depends — read onYou are a student or scholar on an F, J or M visa. The answer splits, and it splits differently by status. An F-1 student with actual authorised employment, or a J-1 whose Responsible Officer has authorised employment in writing, can get a Social Security number and should. An M-1 student can only work in authorised practical training on a DHS employment authorisation document — before that exists there is no SSN route at all. With no SSN route and taxable U.S. money, an ITIN is the right number.
- A
Source: IRS — Instructions for Form W-7 (Rev. 12/2024), read September 8, 2026. Reason codes a–h and the exception list.
If you would rather answer the questions than read the chart, the free ITIN eligibility and document checker asks the same five things and hands you a printable document list for your specific case — which route to use, which Form W-7 box to tick, and exactly which papers go in the envelope. It runs entirely in your browser and your answers are not transmitted to or stored by TaxSaveIQ.
Who needs an ITIN — the four groups
Every one of the eight reason codes on Form W-7 falls into one of four situations. Finding yours here tells you which box to tick and whether a tax return has to be attached.
| Group | Who this is | W-7 reason | Return attached? |
|---|---|---|---|
| You file your own return | A nonresident with U.S. income filing Form 1040-NR, or someone who meets the substantial-presence test and files Form 1040 as a resident. The largest group by volume. | b or c | Yes |
| You are on someone else's return | A spouse being listed on a joint or separate return, or a dependent being claimed for a tax benefit the filer is allowed to claim. | d or e | Yes |
| A U.S. payer needs your number | A bank paying interest, a company paying dividends, a tenant paying rent, a university paying a scholarship, a buyer of your U.S. property, or a lender reporting the mortgage interest you paid. | a or h | Usually no — an exception applies |
| You are a visa-holding student or scholar | F-1, J-1 or M-1. Whether you need an ITIN or an SSN depends on whether your status permits work. | f or g | Depends |
Source: IRS — Instructions for Form W-7 (Rev. 12/2024), read September 8, 2026.
The eight boxes on Form W-7, in plain English
| Box | What the form says | What it means | Return? |
|---|---|---|---|
| a | Nonresident alien required to get an ITIN to claim a tax treaty benefit | You are claiming a treaty rate on U.S. income and the payer needs a number. | Not always |
| b | Nonresident alien filing a U.S. federal tax return | You have to file a Form 1040-NR — the most common reason for people outside the U.S. | Yes |
| c | U.S. resident alien filing a U.S. federal tax return | You pass the substantial-presence test and file a Form 1040 — the most common reason for people living in the U.S. | Yes |
| d | Dependent of a U.S. citizen or resident alien | Someone is claiming you as a dependent for a tax benefit they are allowed to claim. | Yes |
| e | Spouse of a U.S. citizen or resident alien | You are being listed on a joint return, or on a separate return that needs your number. | Yes |
| f | Nonresident alien student, professor or researcher filing a U.S. tax return, or claiming an exception | The F, J and M visa case — see the students page for which part applies to you. | Not always |
| g | Dependent or spouse of a nonresident alien holding a U.S. visa | Your spouse or parent is here on a visa and you are on their return. | Yes |
| h | Other | The exceptions — treaty income, scholarships, mortgage interest, property sales. You write the reason on the line. | Not always |
Ticking the wrong box is one of the quieter causes of a rejection, because the box tells the examiner which documents to expect. A dependent filed under box b looks like an incomplete nonresident application rather than a complete dependent one. The W-7 walkthrough goes line by line.
Source: IRS — Instructions for Form W-7 (Rev. 12/2024), read September 8, 2026.
Who does not need an ITIN
A surprising share of applications are for people who should not be applying at all. Each of these costs weeks and produces a rejection notice.
- Anyone eligible for a Social Security number. If your immigration status permits employment, you can get an SSN, so the IRS will not issue you an ITIN. Apply to the Social Security Administration instead — it is free, and an SSN reaches credits an ITIN cannot.
- Anyone who already has an SSN. Use it. Never file with both numbers, and if you hold an old ITIN, ask the IRS to merge the records — see from ITIN to SSN.
- Someone who just wants a number for the future.An ITIN is issued against a federal tax purpose that exists now. There is no “apply early” option, and an unused number expires anyway.
- A business. A company, partnership or LLC needs an Employer Identification Number, not an ITIN. The two are different applications with different forms, and a foreign owner may well need both — the ITIN for themselves, the EIN for the entity.
- A spouse or dependent nobody is claiming.Since tax years beginning after 2017, the IRS does not issue an ITIN to a spouse or dependent unless they are claimed for an allowable tax benefit. A number “just in case” is no longer available.
Source: IRS — Tax Topic 857, Individual taxpayer identification number, read September 8, 2026. Spouse and dependent restriction is stated in Tax Topic 857.
What an ITIN does and does not get you
This is the section most pages blur, usually because the site is selling an application service and a shorter list of limits reads better. Here is the honest version. The IRS states in four bullets what an ITIN does not do, and they are worth reading literally.
- Let you file a federal tax return and be issued a refund you are owed
- Let you be claimed as a spouse or dependent on someone else's return, where a tax benefit allows it
- Let a payer report income to you and apply the correct withholding rate
- Let you claim a tax-treaty benefit that reduces withholding on U.S. income
- Qualify you for Social Security benefits or the Earned Income Tax Credit
- Provide or change immigration status
- Authorize you to work legally in the U.S.
- Serve as identification outside the federal tax system
Source: IRS — Individual taxpayer identification number (ITIN), read September 8, 2026. The right-hand column is the IRS's own list, quoted.
The fourth item on the right is the one that catches people out. An ITIN is not identification. A bank, a landlord or a state agency may choose to accept it as part of their own process, and many do — but that is their policy, not a right the number confers, and it can change without notice. Anyone telling you an ITIN is a form of U.S. ID is describing a practice, not a rule.
ITIN vs SSN, in short
| 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. |
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.
That is the short form. The full ITIN vs SSN comparisonholds every row and takes each apart, including the three where the honest answer for an SSN is also “no”. It is the page to read if what you want is the matrix rather than the overview.
Credits an ITIN filer can and cannot claim
This is where filing with an ITIN costs real money, and where the internet is most out of date. Several rows moved in the last year, and most of them are household tests rather than filer tests — the answer turns on which person holds which number, which is why a flat “ITIN filer: no” table is wrong more often than it is right.
| 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. |
These are the rows that matter here. The complete credit and deduction matrix, with every row and the SSN comparison alongside it, is on ITIN vs SSN.
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.
Child Tax Credit: available. 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.Her husband's number satisfies the taxpayer half; the children satisfy the other. Two children at up to $2,200 each — and note that this is exactly the case a flat “ITIN filer = no” table gets wrong.
American Opportunity Credit: also depends on whose numbers are involved. 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.Her husband's SSN meets the taxpayer half here too, so the credit survives if the college-age child — their dependent — holds a valid-for-work SSN. This is a change; a guide written in 2024 would have told them something else.
Earned Income Tax Credit: not available while Maria holds an ITIN. The credit requires an SSN valid for employment for everyone on the return.
The arithmetic here is not the point. The point is that which spouse holds which number changes the answer, and no generic table can tell you — run the numbers on the Family Tax Credit Finder and the 2026 federal tax calculator.
Applying in outline, and how long it really takes
The outline is the same for everyone; what varies is which route you use and what goes in the envelope. This is the summary. The line-by-line walkthrough of Form W-7 — every box, every document rule, and what to do when a notice arrives — lives on how to apply for an ITIN with Form W-7, which is the page to open when you are actually filling the form in.
- Confirm you cannot get a Social Security numberThis is a condition of eligibility, not a formality. Everything downstream is wasted if it fails.
- Complete Form W-7 and tick the reason boxYour name has to match your passport exactly. The current revision is dated December 2024 — download it from the IRS rather than from a third-party site.
- Gather the supporting documentsOriginals, or copies certified by the agency that issued them. A notary cannot certify a document for an ITIN application. A valid passport is the only document that works on its own.
- Attach the tax return the number is forUnless one of the five exceptions applies, in which case that exception's own evidence goes in instead.
- Choose one of three routesMail it, take it to an IRS Taxpayer Assistance Center by appointment, or use a Certifying Acceptance Agent. Only the first puts your passport in the post.
- Wait, and watch for a noticeA CP565 assigns the number. A CP566 asks for more information — reply fast and in full. A CP567 rejects the application and gives the reason.
The three routes at a glance
| Route | Cost | Do your originals leave your hands? | Appointment |
|---|---|---|---|
| Mail to the IRS ITIN Operation | Free (you pay postage) | Yes — originals mailed | None needed |
| IRS Taxpayer Assistance Center (TAC), in person | Free | No — returned same visit | Required — call ahead |
| Certifying Acceptance Agent (CAA) | Fees vary — set by the agent, not the IRS | Depends on the agent | Set by the agent |
The full comparison — including what each route's reviewer is not allowed to certify, which is the detail that sends people to the wrong door — is on the how to apply page.
Source: IRS — How to apply for an ITIN, read September 8, 2026.
The timeline, drawn to scale
- You submitweek 0
W-7, the tax return it is attached to, and your documents leave your hands.
- Receipt and sortingweeks 1–3
The ITIN Operation logs the package. Nothing is visible to you during this stage.
- Document reviewweeks 3–6
An examiner checks the documents against the reason code you claimed. Anything missing produces a CP566 request for more information, which restarts the clock.
- Decisionweeks 6–7
A CP565 assigns the number, or a CP567 rejects the application.
- Documents returnedweeks 7–11
Originals are mailed back. Peak season and overseas applications sit at the long end of every stage above.
Source: IRS — Individual taxpayer identification number (ITIN), read September 8, 2026. Both windows are IRS-stated notification times, not refund times.
Expiry, renewal, and the day you finally get an SSN
An ITIN is not permanent. It lapses from disuse, on a three-year clock, and a return filed with a lapsed number is processed slowly and can lose credits along the way. The rule is simple: one federal return in three years keeps it alive.
Older articles describe a middle-digit expiry schedule, where the IRS retired blocks of numbers by their fourth and fifth digits year by year. That programme ran its course. What remains is the three-year non-use rule, and that is what the renewal and expiration page sets out, with a timeline showing exactly which numbers lapse at the end of this year.
The happier ending is the one covered on from ITIN to SSN. 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 are merged. Skip that letter and your earlier wages and withholding stay attached to a number the IRS no longer connects to you, which is exactly how a refund goes missing.
The rest of this guide
Each page below answers one question completely rather than summarising all of them badly. Start with the checker if you want an answer in two minutes.
| Page | Answers |
|---|---|
| ITIN eligibility & document checker | Do I need one, which route, and exactly which documents — as a printable checklist |
| How to apply: Form W-7 step by step | The form line by line, the three routes compared, the document rules, and what a rejection means |
| ITIN vs SSN | What each number lets you do, without the blurring |
| Renewal and expiration | Whether yours has expired, how to tell, and how to renew |
| Spouse and dependents | Household cases, including dependents living outside the U.S. |
| International students and scholars | F-1, J-1 and M-1 — when it is an ITIN and when it is an SSN |
| Self-employed and gig work | 1099 income, Schedule C, self-employment tax and quarterly payments with an ITIN |
| From ITIN to SSN | The year your status changes and what happens to your filing history |
| Find a lost ITIN | Recovering the number, and what each IRS notice means |
Once you have the number, the tax work starts. The 2026 federal tax calculator, self-employment tax calculator and quarterly estimated tax planner are free, need no account, and run in your browser.
Frequently asked questions
What is an ITIN number?
An ITIN is an Individual Taxpayer Identification Number: a nine-digit number the IRS issues so someone who cannot get a Social Security number can still file a federal tax return. It is formatted like an SSN and always begins with 9. It exists for one purpose — federal tax administration — and the IRS states plainly that it does not serve as identification outside the federal tax system.
Who needs an ITIN?
Anyone with a federal tax reason for needing a taxpayer number who is not eligible for a Social Security number. In practice that is four groups: people who must file their own U.S. return, spouses and dependents being listed on someone else's return for an allowable tax benefit, people whose U.S. bank, university, tenant or property buyer must report money to them, and some students and scholars whose visa does not permit work.
Can you work legally 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 and does not provide or change immigration status. Work authorization comes from your immigration status, never from a tax number. An ITIN lets you report income and pay tax on it; that is a separate question from whether you were permitted to earn it.
How long does it take to get an ITIN in 2026?
The IRS asks you to allow seven weeks to be notified of your application status, and nine to eleven weeks if you apply between January 15 and April 30 or from outside the United States. Note the wording: that is the time to be told the outcome, not the time to receive a refund. The tax return attached to your application is only processed once the number is assigned.
Does an ITIN expire?
Yes. If an ITIN is not used on a U.S. federal tax return for any three consecutive tax years, it expires on December 31 after the third tax year of non-use. Read the "after" literally: a number unused across the 2023, 2024 and 2025 returns expires on December 31, 2026, a full year after 2025 ends, because the 2025 return is not due until the following spring. One return in any three-year window keeps it alive. There is one carve-out: if your number only shows up on information returns reporting payments to you, such as a Form 1099, you do not have to renew it.
Can I get an ITIN without filing a tax return?
Usually no — the tax return is the reason the number is issued, and the two travel together in one envelope. Five exceptions let you apply without one: passive income with third-party withholding or a treaty benefit, wages and scholarships in certain cases, third-party reporting of mortgage interest, the sale of U.S. real property by a foreign person, and a narrow reporting rule. Each replaces the return with its own evidence, and the evidence genuinely differs — Exception 1(a) wants the partnership agreement showing you are a partner, 2(a) wants Form 8233, 4 wants the buyer's letter. There is no single letter that satisfies all five.
Can an ITIN filer claim the Child Tax Credit in 2026?
It depends on the household's Social Security numbers, not on the fact of an ITIN. On a joint return the test is met if at least one spouse has an SSN valid for employment; the other spouse may hold an ITIN issued by the return's due date. Each qualifying child separately needs an SSN valid for employment issued before that date. So an ITIN spouse does not end the credit — a household where nobody has the required SSN does, and so does a child who holds an ITIN. What remains in that case is the $500 Credit for Other Dependents.
Is applying for an ITIN safe if my immigration status is unresolved?
An ITIN application goes to the IRS for tax administration, and the IRS states that an ITIN provides no immigration status and no work authorization. It is a tax filing question, not an immigration filing. That said, immigration consequences are outside what any tax site can responsibly assess — if your status is unresolved, speak to a licensed immigration attorney or a DOJ-accredited representative before you file anything.
How much does it cost to get an ITIN?
The IRS charges nothing. Mailing the application is free apart from postage, and applying in person at an IRS Taxpayer Assistance Center is free. A Certifying Acceptance Agent is a private business and sets its own fee — the IRS says only that fees may vary. You are paying an agent to check your paperwork, not to make the IRS decide any faster.
Where these figures come from
Every rule on this page traces to an IRS source, read on September 9, 2026. Processing times, credit rules and expiration schedules change; if you are reading this long after that date, check the linked source before you rely on a number.
- IRS — Individual taxpayer identification number — definition, the four-item “does not” list, processing times.
- IRS — Instructions for Form W-7 (Rev. 12/2024) — reason codes, the document table, the five exceptions.
- IRS — How to renew an ITIN — the three-year rule and the consequences of filing with an expired number.
- IRS — Child Tax Credit — the Social-Security-number condition and the $500 Credit for Other Dependents.
- Public Law 119-21 — the education-credit and new-deduction changes effective for tax years beginning after 31 December 2025.
- IRS — Schedule 1-A, Additional Deductions and the Treasury and IRS final regulations on the car loan interest deduction (T.D. 10054, published 8 September 2026) — which of the four new deductions carry a Social Security number condition, and which turns on the vehicle and the VIN instead.
Our editorial methodology explains how these pages are sourced and reviewed. Questions on ITIN applications go to the IRS on 800-829-1040 inside the United States, or 267-941-1000 from outside it (not a toll-free number).