Can You File Taxes Without a Social Security Number?

You can file a federal tax return without a Social Security number by applying for an Individual Taxpayer Identification Number (ITIN) from the IRS. Federal law requires every person filing a return to include a taxpayer identification number, and the IRS is authorized to issue ITINs to people who have a tax filing obligation but cannot get a Social Security number.¹ Families adopting a U.S. child who cannot get a Social Security number in time can use a temporary Adoption Taxpayer Identification Number (ATIN) instead.

What an ITIN Is (and Isn’t)

An ITIN is a nine-digit number that begins with “9” and is formatted like a Social Security number. The IRS issues it to nonresident aliens, resident aliens, and their spouses or dependents who need to file a federal tax return but are not eligible for a Social Security number.²

An ITIN exists for one purpose: federal tax processing. It does not give you the right to work in the United States, and it does not qualify you for Social Security benefits.³ Its role is to let you meet a tax obligation, claim a refund, or supply a taxpayer number when another federal rule requires one.

How to Apply for an ITIN

Form W-7 and Your Filing Reason

You apply by completing IRS Form W-7 and checking the reason that fits your situation. The categories include nonresident aliens filing a return, resident aliens who meet the substantial presence test, dependents or spouses of U.S. citizens or residents, and foreign students, professors, and researchers temporarily in the country.⁴

Documents You Need

Your application must prove both your identity and your foreign status. A valid passport is the simplest option because it covers both on its own. Without a passport, you need at least two documents from an IRS list of 13 acceptable items, and at least one must show a photograph (with an exception for dependents under 14, or under 18 if a student).⁴ Other accepted items include a USCIS photo ID, a U.S. visa, a U.S. or foreign driver’s license, a national identification card, a civil birth certificate, and, for young dependents, medical or school records.

All documents must be originals or certified copies from the issuing agency. Notarized photocopies are not accepted.

Three Ways to Submit

The standard route is to attach Form W-7 to the front of your paper federal tax return and mail the package to the IRS ITIN Operation in Austin, Texas.⁵ First-time applicants cannot e-file, since you do not yet have a taxpayer number. The drawback is that your original documents travel with the application and can be out of your hands for weeks.

You can instead visit an IRS Taxpayer Assistance Center that offers ITIN services, where staff verify your documents in person and hand them back the same day. Appointments are required through 844-545-5640, and wait times can run several weeks. Each applicant, including spouses and dependents, must appear in person. Most documents can be authenticated on the spot, though school and medical records for dependents still have to be mailed.⁶

A third option is to work with an IRS-authorized Certifying Acceptance Agent (CAA). CAAs verify your identity and original documents in person and submit the application for you, so you do not have to mail your passport to the IRS.⁷ They charge a fee, often ranging from around $50 to several hundred dollars depending on the provider and whether tax preparation is included.

How Long It Takes

The IRS generally processes an ITIN application in about seven weeks and notifies you of the outcome. Applications filed during tax season (January 15 through April 30) or from outside the United States can take 9 to 11 weeks.³ The tax return you attached is processed after the ITIN is assigned, so a refund will take longer than a standard e-filed return.

The date the IRS receives your Form W-7 usually becomes your ITIN assignment date. That matters because some tax credits require the taxpayer number to be issued on or before the return’s due date, including extensions.⁸ Filing early is the safest way to meet that cutoff.

Which Credits You Can Claim With an ITIN

An ITIN lets you file and pay, but it does not open every credit on the return. Two of the largest refundable credits are off-limits.

You cannot claim the Earned Income Tax Credit with an ITIN. The statute defines the required taxpayer number for the EITC as a Social Security number issued by the Social Security Administration, and both spouses on a joint return must have valid Social Security numbers.⁹¹⁰

The Child Tax Credit and Additional Child Tax Credit require each qualifying child to have a Social Security number valid for employment, issued before the return’s due date. An ITIN does not satisfy that requirement.¹¹

If your child or dependent has an ITIN or ATIN, you may still qualify for the Credit for Other Dependents, worth up to $500 per dependent. The dependent must be claimed on your return and be a U.S. citizen, national, or resident alien.¹¹

A refund on an ITIN return can therefore be smaller than one for an otherwise identical filer with a Social Security number. Knowing which credits apply before you file helps you avoid claims that will be denied and delay processing.

Renewing an Expired ITIN

An ITIN expires on December 31 of the third consecutive year in which it is not used on a federal return.¹² Some older ITINs issued before 2013 have already been phased out based on middle digits, so confirm your number is still active before filing.

Renewal uses the same Form W-7, with the “Renew an existing ITIN” box checked. You submit the same kinds of identity documents and attach the renewal to a federal return (or qualify for an exception). If your legal name has changed, include documentation such as a marriage certificate or court order.¹² Spouses and dependents renewing must be listed on the attached return along with the schedule or form for the tax benefit being claimed.

Pending Adoptions: The ATIN

If you are adopting a child who is a U.S. citizen or resident and cannot get a Social Security number for the child in time to file, you can apply for a temporary ATIN using Form W-7A.¹³ Do not apply for an ATIN if the child can get a Social Security number before your filing deadline, and use Form W-7 for an ITIN instead if the child is not a U.S. citizen or resident.

Form W-7A collects the child’s basic information along with the adoptive parents and placement agency, and it must be supported by legal proof that the child has been placed in your home for adoption. That can be a placement agreement from an authorized adoption agency or a court order establishing legal guardianship, showing placement by a government-authorized entity.¹³

Once issued, the ATIN goes in the dependent section of your return where a Social Security number would appear. It lets you claim the Credit for Other Dependents and other applicable benefits during the adoption. The IRS deactivates an ATIN within two years, so it is strictly temporary. After the adoption is finalized, get a Social Security number for the child, notify the IRS so the ATIN is deactivated, and use the Social Security number on future returns. That switch also opens the door to the full Child Tax Credit if the other requirements are met.

What Happens If You Don’t File

Lacking a Social Security number is not a reason to skip filing. If you owe tax and do not file, the IRS charges a failure-to-file penalty of 5% of the unpaid tax for each month or partial month the return is late, up to 25%.¹⁴ If the return is more than 60 days late, the minimum penalty is $525 (for returns due in 2026) or 100% of the unpaid tax, whichever is less.¹⁵

Beyond the dollar penalties, gaps in your tax history can complicate later immigration applications and make it harder to show a consistent record if you eventually apply for a Social Security number or adjust status. Getting an ITIN and filing on paper avoids both problems.

1
Office of the Law Revision Counsel. 26 U.S.C. 6109 – Identifying Numbers
2
Internal Revenue Service. Taxpayer Identification Numbers (TIN) – Section: Individual Taxpayer Identification Number (ITIN)
3
Internal Revenue Service. Individual Taxpayer Identification Number (ITIN)
4
Internal Revenue Service. Instructions for Form W-7
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Internal Revenue Service. How to Apply for an ITIN
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Internal Revenue Service. IRS Taxpayer Assistance Centers with ITIN Services
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Internal Revenue Service. ITIN Acceptance Agent Program
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Internal Revenue Service. ITIN Application Frequently Asked Questions
9
Office of the Law Revision Counsel. 26 U.S.C. 32 – Earned Income
10
Internal Revenue Service. Who Qualifies for the Earned Income Tax Credit (EITC)
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Internal Revenue Service. Child Tax Credit
12
Internal Revenue Service. How to Renew an ITIN
13
Internal Revenue Service. About Form W-7 A, Application for Taxpayer Identification Number for Pending U.S. Adoptions
14
Internal Revenue Service. Failure to File Penalty
15
Internal Revenue Service. Topic No. 653, IRS Notices and Bills, Penalties and Interest Charges