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ITIN Application: Form W-7 Guide for Foreigners (2026)
Short answer: An ITIN is a tax ID for foreigners who need a US taxpayer number but cannot get a Social Security number. You apply with Form W-7, normally filed with a federal tax return. The IRS says allow 7 weeks, or 9 to 11 in peak season or from overseas.
Key takeaways
An ITIN is for federal tax purposes only. It does not change immigration status or allow you to work.
A new application must include a federal tax return unless an exception applies.
You can apply by mail, in person at an IRS Taxpayer Assistance Center, or through an Acceptance Agent.
An ITIN not used on a federal return for 3 consecutive tax years expires and must be renewed.
You do not need an ITIN to request a Form 4868 extension or make estimated tax payments.
What an ITIN is and who needs one
An Individual Taxpayer Identification Number (ITIN) is a nine-digit number for individuals who must have a US taxpayer identification number for federal tax purposes but cannot get a Social Security number.
Typical examples are a foreign spouse or dependent on a US return, or a foreign individual with a US filing requirement of their own.
An ITIN has limits. It does not give Social Security benefits, does not change your immigration status or right to work, and filers with ITINs cannot claim the earned income credit. For tax years 2018 through 2025, the December 2024 Form W-7 instructions say a child with an ITIN cannot be claimed as a qualifying child for the child tax credit.
Who does not need one
Do not file Form W-7 if you have a Social Security number or are eligible for one. US citizens and people admitted for permanent residence or US employment are eligible for an SSN.
If you are a foreign owner getting an EIN for a US company, an ITIN is not automatically part of that. On Form SS-4, if the responsible party has no SSN or ITIN and cannot get one, you enter "foreign" or N/A on line 7b. On Form 5472, a related foreign owner without a US identifying number uses a reference ID number instead.
What Form W-7 requires
Documents. You must prove identity and foreign status with original documents or copies certified by the issuing agency. The IRS lists 13 acceptable documents. A passport is the only stand-alone document, and at least one must have a photo unless the applicant is a young dependent. Documents must be current, and the IRS returns them to you.
A tax return. A new ITIN application must include a federal tax return unless an exception applies. The IRS says to apply on or before the return due date and to put the return inside the ITIN package. The W-7 instructions describe the exceptions, and we check whether one fits your case before deciding anything.
Dependents. Dependents applying must also prove US residency in most cases. The exceptions are dependents of overseas US military and, for most credits, applicants from Canada or Mexico.
The three ways to apply
The Form W-7 instructions describe three routes:
By mail. Send Form W-7, the return and your documents to the IRS ITIN Operation in Austin, TX.
In person. Go to a designated IRS Taxpayer Assistance Center, by appointment (844-545-5640).
Through an agent. Use an Acceptance Agent or Certifying Acceptance Agent, in the US or abroad.
An Acceptance Agent helps complete Form W-7 and must send the IRS original documents or issuer-certified copies for all applicants. A Certifying Acceptance Agent can also verify original documents and certified copies for primary and secondary applicants and dependents, and return them immediately. Exceptions: foreign military ID cards, and for dependents only passports and birth certificates. Certifying Acceptance Agents can also work with the IRS to resolve application issues.
On cost, the IRS comparison table labels applying at a Taxpayer Assistance Center and at VITA sites "Free." It labels Acceptance Agents and Certifying Acceptance Agents "Fee-based," with fees that vary by agent.
How long it takes
The IRS says to allow 7 weeks for notice of your ITIN status. Allow 9 to 11 weeks during peak season (January 15 to April 30) or when you file from overseas. These are IRS timeframes, not a promise about your case.
Expiration and renewal
An ITIN that is not included on at least one federal tax return in 3 consecutive tax years expires on December 31 of the third consecutive year. You must renew it before using it on a return again. Renewal uses Form W-7 with the return.
An ITIN used only on third-party information returns does not need renewing until it is needed on an income tax return.
ITIN vs EIN
An ITIN identifies an individual for federal tax purposes. An EIN is the number a business entity uses, applied for on Form SS-4. A US single-member LLC owned by a foreign person needs an EIN to file Form 5472. People with no US residence or business presence cannot use the online EIN application.
How we help
We prepare your Form W-7 together with the tax return it attaches to. That covers foreign spouses, dependents, foreign owners of US companies and foreign investors, in English or Spanish, entirely remotely. Sabih Shafi is an IRS Enrolled Agent, federally licensed to represent taxpayers in all 50 states.
If you want ITIN application help, we explain the three routes above and help you pick the one that fits your documents and location. The fee is flat and quoted in writing before work starts.
Book a free 20-minute review: https://www.allstatetaxresolution.com/booking-calendar/free-tax-review-20-min?referral=service_list_widget or call or text (323) 900-0305.
General information, not tax advice for your situation.
Frequently Asked Questions
Can I apply for an ITIN without filing a tax return?
A new application must include a federal tax return unless an exception applies. The IRS says to put the return inside the ITIN package.
Does an ITIN let me work in the US?
No. An ITIN is for federal tax purposes only and does not change your immigration status or your right to work.
Do I need an ITIN to get an EIN for my LLC?
Not necessarily. Form SS-4 lets a responsible party with no SSN or ITIN enter "foreign" or N/A on line 7b. An entry on that line is required.
How long does an ITIN last?
One not included on a federal return in 3 consecutive tax years expires on December 31 of the third year. Renew it with Form W-7 and the return.
Can I apply from outside the US?
Yes. You can apply by mail or through an agent in the US or abroad. The IRS says to allow 9 to 11 weeks when filing from overseas.
Last reviewed: October 2026 by Sabih Shafi, EA
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This article is general information, not individual tax advice. If you want to talk through your own IRS or state balance, book a free 20-minute review or call or text us directly.
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