If you’re running a US business and you don’t have a Social Security Number, sooner or later the IRS is going to ask for an ITIN. It’s the nine-digit number that lets you file a personal US tax return, claim treaty benefits, and open certain accounts — without ever needing SSN eligibility. This guide covers what an ITIN actually is, who needs one, how the Form W-7 application works, and what to expect once you have it.
An ITIN is a federal tax ID for people who need to file US taxes but don’t qualify for a Social Security Number. It doesn’t grant work authorization or immigration status — it’s strictly a tax processing number. We prepare and certify your application as part of onboarding, so you never have to mail your passport to the IRS.
What is an ITIN?
An Individual Taxpayer Identification Number (ITIN) is a nine-digit number the IRS issues to people who have a US tax obligation but aren’t eligible for a Social Security Number. It’s always formatted like an SSN and always starts with a 9: 9XX-XX-XXXX. The IRS created the ITIN in 1996 for exactly this reason — a US tax filing shouldn’t depend on immigration status.
The most recently published IRS figures, from 2022, show roughly 3.8 million ITIN returns filed, reporting $14.4 billion in taxable income and contributing about $6.5 billion toward Social Security and Medicare — programs ITIN holders fund but can’t draw benefits from. Processing a new application typically takes 7–11 weeks.
An ITIN is for federal tax purposes only. It doesn’t provide work authorization, immigration status, or eligibility for Social Security benefits or the Earned Income Tax Credit.
ITIN vs. SSN vs. EIN
These three numbers get mixed up constantly. Here’s the distinction that matters:
| Feature | ITIN | SSN | EIN |
|---|---|---|---|
| Issued to | Individuals without SSN eligibility | Citizens, residents, eligible visa holders | Business entities |
| Purpose | File federal taxes | Employment & benefits | Business identification |
| Starts with | 9 | Any digit | Varies |
| Work authorization | No | Yes, if eligible | N/A |
| Application | Form W-7 | Social Security Administration | Form SS-4 |
Every US business needs an EIN, regardless of whether its owner has an ITIN, an SSN, or neither — see how to get an EIN without an SSN or ITIN. If you own a foreign-owned single-member LLC, you’ll typically need both: an EIN for the business, and an ITIN so you can report the business’s income on your own return.
Who actually needs an ITIN
You need one if you have a US federal tax purpose and don’t qualify for an SSN. That covers most non-resident founders, plus a few other common cases:
- You’re a nonresident alien filing a US tax return.
- You’re claiming a tax treaty benefit.
- You’re a dependent or spouse of a US citizen or resident.
- You’re a foreign business owner reporting US-source income.
- You need one to open an interest-bearing bank account or apply for a business loan.
You don’t need one if you’re a US citizen, hold a green card, have a work visa that makes you SSN-eligible, already have an SSN, or you’re not filing a US return at all.
What counts as a “federal tax purpose”
In practice, this means one of four things applies to you: you’re legally required to file a federal return, you want to claim a refund or benefit, you’re reporting income, or a federal filing requires a tax ID from you. If none of those apply, you don’t need to apply yet.
Applying: Form W-7, documents, and a tax return
An ITIN application has three parts: Form W-7, supporting identity documents, and — in most cases — the US tax return you’re filing the ITIN for, attached to the same package.
The documents you’ll need
A valid passport is the only document that works on its own, since it proves both identity and foreign status in one document. Without a passport, you’ll need two other documents instead — a national ID card, US or foreign driver’s license, USCIS photo ID, US visa, or (for dependents) a birth certificate, medical, or school record. At least one document needs a photo, everything must be current, and copies need an official certified stamp from the issuing agency.
If you mail original documents to the IRS, expect them back within 60 days. A Certifying Acceptance Agent avoids that entirely — they authenticate your documents and hand them straight back.
Four ways to submit your application
- By mail — free and direct to the IRS Austin service center, but the slowest route, with a 60-day wait to get your originals back and real risk if anything gets lost in transit.
- Through a Certifying Acceptance Agent (CAA) — an IRS-authorized agent who verifies your original documents on the spot and hands them straight back, so nothing ever leaves your possession. This is the route we use for every client.
- At an IRS Taxpayer Assistance Center — free, but appointments run weeks out, locations are limited, and TACs can’t authenticate school or medical records.
- At a VITA site — free ITIN help paired with tax prep, though availability is very limited, US-only, and often income-restricted.
When we handle your ITIN application as your Certifying Acceptance Agent, you keep your passport the entire time. We complete Form W-7, certify your documents, attach the right return, and follow up directly with the IRS if anything needs a response.
How long it takes, and what the IRS sends back
Standard processing runs about 7 weeks; expect 9–11 weeks if you’re applying during tax season (January–April) or from outside the US. Along the way, you may hear from the IRS directly:
| Notice | Meaning | What to do |
|---|---|---|
| CP565 | ITIN assigned | Nothing — keep it for your records |
| CP566 | More information needed | Respond with the requested documents |
| CP567 | Application rejected | Resubmit with corrections |
Tax benefits an ITIN unlocks — and what it doesn’t
An ITIN comes with real limits, but it also opens up several benefits: joint filing with a US citizen or resident spouse, Head of Household status, the American Opportunity Tax Credit, the Premium Tax Credit, and the Credit for Other Dependents.
It doesn’t get you Social Security benefits (even on contributions you’ve made), the Earned Income Tax Credit, or the Child Tax Credit — a 2025 update to federal tax law made permanent the requirement that a qualifying child have a Social Security Number, so ITIN-only dependents still don’t qualify for the CTC. That’s a durable rule now, not a temporary one set to expire.
ITINs expire — here’s when and how to renew
ITINs aren’t permanent. Yours expires under either of two conditions:
- Three years of non-use — if it hasn’t appeared on a federal return for three consecutive years, it expires on December 31 of the third year.
- Middle-digit expiration — ITINs with middle digits 70–88, or 90–92 and 94–99 issued before 2013, have already expired.
Filing with an expired ITIN doesn’t stop your return from being accepted, but the IRS holds your refund and any credits you’d otherwise qualify for until you renew — which can mean real delays if you’re depending on that refund.
Renewing works exactly like applying for a new ITIN: complete Form W-7, check the “renew” box, enter your expired ITIN, and attach your current year’s return along with current identity documents.
Start renewing at least 45 days before you file. And if your ITIN only ever shows up on information returns like a 1099, you don’t need to renew it unless you’re actually filing a tax return.
Using your ITIN for business
Most US banks require an SSN or ITIN to open a business account, so having one ready removes a common bottleneck right after forming your LLC — it lets you open an interest-bearing account, apply for business credit cards, and start building a US credit history alongside your bookkeeping.
If your company is a foreign reporting company — one formed under another country’s law and registered to do business in the US — it also has a separate obligation: filing Beneficial Ownership Information with FinCEN. Existing foreign reporting companies had to file by April 25, 2025; new registrations get 30 days from their registration notice. US-formed companies and US persons are currently exempt from BOI reporting entirely, so this mainly applies if your LLC’s member is itself a foreign entity.
What an ITIN does — and doesn’t — share
Section 6103 of the tax code protects your ITIN information from routine sharing with other government agencies; the IRS built the ITIN specifically to be a tax tool, not an enforcement one. In April 2025, the IRS and Department of Homeland Security signed an agreement allowing narrow, non-tax information sharing with ICE, limited to individuals who already have final orders of removal — not a general lookup. That agreement has drawn several legal challenges with split outcomes so far. A D.C. Circuit panel declined to block IRS-ICE sharing in one case in February 2026, but a separate federal court has had an injunction in place since November 2025 limiting IRS disclosures to strict statutory compliance, and a Massachusetts court has barred DHS and ICE from using data already disclosed. That Washington injunction is now on appeal, with the appeals panel signaling in May 2026 that it may uphold the block. None of this litigation is final. We’ll keep this section current as it develops, but for the vast majority of ITIN holders, the ITIN remains what it was built to be: a way to meet a tax obligation, not a data trail.
Moving from ITIN to SSN
If you later become SSN-eligible — a green card or work visa, for example — stop using your ITIN and notify the IRS so your records merge under the new number. Mail the IRS your name, address, ITIN, a copy of your CP565 notice, and a copy of your new Social Security card; the IRS voids the ITIN and transfers your tax history to the SSN. Skipping this step can cost you credit for wages and withholding that should already be on record.
A quick founder checklist
- A valid passport is the fastest path — it’s the only document that works alone.
- Apply or renew at least 45 days before you need to file.
- Use a Certifying Acceptance Agent if you’d rather not mail your passport.
- Track your ITIN’s expiration: three years of non-use, or an already-expired middle-digit range.
- Notify the IRS the moment you become SSN-eligible.
None of this needs to be something you manage alone. When we form your company or prepare your federal tax return, we handle the ITIN application as part of getting you set up — Form W-7, document certification, and direct IRS follow-up — so it’s one less form standing between you and running your business.
