This guide is for Australia-based individuals and businesses dealing with U.S. payroll, tax, or immigration questions. It separates three things people often confuse: SSN eligibility, work authorisation, and Individual Taxpayer Identification Number (ITIN) eligibility.
Key Takeaways
- An SSN records U.S. earnings; an ITIN handles federal tax processing when you can't get an SSN.
- An SSN alone never gives permission to work in the U.S.
- The wording on the card and your immigration documents decide how the number can be used.
- Check current rules with the SSA, USCIS, the IRS, or a qualified adviser before applying.
What Does "Nonresident Alien" Mean?
The IRS definition
Under IRS guidance, a non-US citizen is a nonresident for tax purposes unless they meet one of two tests:
- Green card test: lawful permanent resident status at any time during the calendar year.
- Substantial presence test: at least 31 days in the current year and 183 weighted days over three years (current-year days, plus one-third of last year's, plus one-sixth of the year before).
Certain F, J, M, and Q students generally exclude their days of presence for the first five calendar years. That affects day-counting only. It is not a blanket exemption from tax.
Tax status is not visa status
The IRS treats immigration status and tax classification as separate things. Someone can be a nonresident alien for tax purposes and still be lawfully in the US on a visa that permits work.
An F-1 student who arrived in August 2020, for example, stays a nonresident through 2024 and becomes a resident for 2025 once the exemption ends.
Australian tax residency stays separate
US nonresident status does not replace Australian residency analysis. The ATO applies its own residency rules, and an Australian tax file number (TFN) is a separate reference for Australian tax and superannuation. Weigh cross-border obligations in each country on their own terms.
When Can a Nonresident Alien Get a Social Security Number?
The main route: work authorisation
According to the SSA's noncitizen publication, only noncitizens authorised to work by the Department of Homeland Security (DHS) can generally get an SSN. Evidence depends on your category:
| Category | Typical employment evidence |
|---|---|
| F-1 on-campus work | Letter from the designated school official (DSO), plus a recent payslip or signed employer letter |
| F-1 CPT | I-20 employment page signed by the DSO, plus I-94 |
| F-1 OPT | Employment Authorization Document (EAD, Form I-766) |
| J-1 | DS-2019; students and interns also need a sponsor's authorisation letter |
| EAD-based categories | EAD showing validity period and conditions |
Student status alone isn't enough. Lawful permanent residents and workers in employment-permitting nonimmigrant classes may also qualify, subject to SSA verification.
The limited nonwork route
Without work authorisation, you qualify only if a federal, state, or local law requires an SSN for a benefit you are otherwise entitled to.
- Federal benefit: a statute or regulation must require the SSN.
- State or local assistance: you must be legally in the U.S., and local law must require the number.
- Evidence: a letter from the agency naming you, citing the law, and confirming you meet other requirements.
Medicaid and Temporary Assistance for Needy Families are examples. SSNs aren't issued solely for college enrolment.
What the card wording means
- No restriction: usable for employment reporting, subject to separate work-authorisation rules.
- "VALID FOR WORK ONLY WITH DHS AUTHORIZATION": temporary, restricted employment eligibility.
- "NOT VALID FOR EMPLOYMENT": a nonwork card that can't prove work authorisation on Form I-9.
Who shouldn't apply
If you have no work authorisation and no qualifying nonwork reason, an ITIN is usually the better option.
SSN vs. ITIN: Which Number Does a Nonresident Alien Need?
An SSN comes from the SSA and ties to wage reporting and Social Security records. An ITIN comes from the IRS for people with a U.S. tax filing or reporting requirement who can't get an SSN.
| Aspect | SSN | ITIN | EIN |
|---|---|---|---|
| Issuer | SSA | IRS | IRS |
| Form | SS-5 | W-7 | SS-4 |
| Purpose | Earnings and Social Security records | Federal tax processing | Identifies a business entity |
| Work rights | Not conferred | Not conferred | Not applicable |
The decision rule
If you're eligible for an SSN through authorised employment, use or apply for the SSN. If you aren't eligible but owe U.S. tax, an ITIN may apply. The two aren't interchangeable.
Practical details
- Form W-7 normally goes with a federal tax return, though documented exceptions exist.
- The IRS accepts 13 document types; a valid passport generally covers identity and foreign status.
- An unused ITIN expires after three consecutive tax years without use on a return.
- Once you receive an SSN, you must use it for tax purposes and stop using the ITIN. Notify the IRS so records can be combined.
- As the IRS puts it, an ITIN "creates no inference concerning your immigration status or your right to work."
VJM Global supports nonresident individuals with Form 1040-NR preparation and ITIN-related tax filings, with pricing quoted by service scope.
How to Apply for an SSN as a Nonresident Alien
Check eligibility and timing first
Identify your immigration category and confirm current work authorisation or a qualifying nonwork need. Then check whether your situation allows an SSN request through an immigration application or requires applying directly with the SSA.
The main route
- Complete Form SS-5. You need at least two documents showing age, identity, and immigration or work status.
- Start online if eligible. SSA's 2026 guidance lets noncitizens begin online but requires a visit to an office or Card Center to finish.
- Attend the interview. First-time applicants aged 12 or over need an in-person interview unless an immigration-linked route applies.
- Submit originals. Use originals or copies certified by the issuing agency. Photocopies and notarised copies are rejected.
Some people can request an SSN alongside an immigrant visa application (Enumeration at Entry) or a green card application (Form I-485). Confirm availability for your case.
Document checklist
- Identity: valid passport or another SSA-accepted document.
- Lawful status: I-94, permanent resident document, or other current DHS record.
- Work authorisation: EAD, or status-specific evidence.
- Students and exchange visitors: I-20, DS-2019, DSO or sponsor letter, job offer or employer evidence.
For foreign-language documents, SSA arranges translation through authorised translators. Translator websites and phone apps aren't permitted under its policy effective December 2025.
After you apply
SSA verifies your information, may ask for more evidence, and mails the card once approved. For timing, see SSA's current processing guidance rather than relying on estimates.
One warning: don't start unauthorised work because you've applied or been issued a number. USCIS says categories needing EAD approval can't begin work before approval. Equally, authorised workers needn't wait for the SSN. SSA says it doesn't require one before you start.
What an SSN Does and Does Not Prove
SSN, Form I-9 and work eligibility
An SSN helps an employer report wages. Employment eligibility is verified separately on Form I-9, using documents from these lists:
- List A: establishes identity and work authorization together.
- List B: identity only; pair with List C.
- List C: work authorization only; an unrestricted SSN card can qualify.
Employees choose which acceptable documents to present. Both restricted card types are unacceptable as List C evidence under USCIS guidance.
What it doesn't prove
SSNs issued to eligible noncitizens are not recognition of citizenship. An SSN also doesn't show permanent residence, current immigration status, or unrestricted permission to work. The SS-5 itself requires separate current immigration evidence.
Protecting your number
- Store the card securely rather than carrying it routinely.
- Share the number only when legitimately required.
- Treat unexpected calls claiming to be from the SSA or IRS as suspect; the FTC warns impersonators seek personal information.
- Report identity theft through IdentityTheft.gov and scams at ReportFraud.ftc.gov.
- Consider an IRS Identity Protection PIN, a six-digit safeguard against fraudulent filing.
Advice for Australian businesses
Australia-based businesses with US payroll, contractor, or cross-border tax questions can consult VJM Global for accounting and tax-advisory support. VJM Global doesn't issue SSNs or decide immigration eligibility.
Frequently Asked Questions
Can a nonresident alien have a Social Security number?
Yes. A nonresident alien may qualify through DHS-authorised employment or a valid nonwork reason, subject to SSA verification.
Can a nonresident alien get an SSN without work authorisation?
Only in limited cases. You must be legally present and show a federal, state, or local law requiring an SSN for a benefit you're otherwise entitled to.
What is the difference between an SSN and an ITIN for a nonresident alien?
An SSN is tied to employment and earnings records. An ITIN is for federal tax processing when you aren't eligible for an SSN.
What documents does a nonresident alien need to apply for an SSN?
You need evidence of identity, age, and immigration status, plus work authorisation or a valid nonwork reason. Requirements vary by status.
How does a nonresident alien apply for an SSN?
Confirm eligibility, then complete Form SS-5 or request one through an eligible immigration process. Follow the SSA's current submission and interview instructions.
Does having an SSN give a nonresident alien permission to work in the United States?
No. Work permission comes from your immigration status or separate DHS authorisation. A nonwork SSN can't be used to work.
