The Complete ITIN Guide for Non-US Residents

What Is an ITIN and Who Needs One?

Using Your ITIN: Banking, Payments & Online Selling

An ITIN is often the practical key to actually getting paid in the United States. Payment processors and online marketplaces are legally required to collect a U.S. taxpayer ID for tax reporting — and for a non-resident who cannot get an SSN, the ITIN fills that role.

ITIN vs SSN: Key Differences

Both Social Security Numbers (SSNs) and Individual Taxpayer Identification Numbers (ITINs) are nine-digit numbers used for US tax identification, but they serve different populations and carry different rights and limitations.

If you are assigned an ITIN and later become eligible for an SSN — through a change in immigration status or naturalization — the SSN takes precedence. Notify the IRS with documentation so your tax records under both numbers can be merged into a single account.

How Non-US Residents Apply for an ITIN

Non-US residents apply for an ITIN using IRS Form W-7 (Application for IRS Individual Taxpayer Identification Number). A complete application package includes the signed W-7, an attached federal tax return in most cases, and original or certified identity documents.

The Three Submission Methods

• By mail to IRS Austin, TX: Processing time 6–14 weeks. Your original passport must be mailed with the application and will be held by the IRS until the ITIN is assigned — the primary risk and inconvenience of this route.
• In person at an IRS Taxpayer Assistance Center (TAC): You must make an appointment at an IRS TAC office inside the United States. Not accessible for most international applicants who are outside the US.
• Through a Certifying Acceptance Agent (CAA): A CAA is authorized by the IRS to review, certify, and submit W-7 applications on behalf of applicants. The CAA authenticates your original identity documents in person — you never mail your passport. SK Financial is a CAA. Typical timeline from document submission to ITIN assignment: 4–8 weeks.

Required Documents

• Form W-7 — completed and signed (must use the current version from IRS.gov)
• Federal tax return attached — the W-7 must accompany a federal tax return in most cases (Form 1040-NR for individuals with US income; pro forma Form 1120 for foreign-owned LLC owners filing Form 5472)
• Identity documentation: A valid passport satisfies both identity and foreign status with a single document. Without a passport, you must provide two separate documents: one establishing identity and one establishing foreign status. The IRS maintains a list of accepted documents on its website.

Situations Where No Tax Return Is Required

The IRS grants exceptions allowing W-7 applications without an attached tax return in specific circumstances:

• Dependents or spouses of US citizens or lawful permanent residents (Exception 1 and 2)
• Third-party withholding on passive income — such as dividends from a US company (Exception 2)
• Mortgage interest reporting (Exception 3)
• Certain gambling winnings (Exception 4)

Contact SK Financial to determine which exception, if any, applies to your situation before filing.

ITIN Requirements for Foreign-Owned LLCs

Foreign nationals who own US LLCs often discover they need an ITIN for reasons beyond simple income tax filing. The specific filing and reporting obligations of a foreign-owned US LLC create individual TIN requirements that cannot be satisfied with the LLC's own EIN.

When a Foreign LLC Owner Needs an ITIN

• Form 5472 and pro forma Form 1120: Foreign-owned single-member LLCs must file Form 5472 attached to a pro forma Form 1120 every year, regardless of income. While the LLC's EIN is used to identify the entity, the foreign owner who signs the return typically needs an individual TIN. The IRS may reject returns where the responsible party's individual TIN is missing.
• Effectively Connected Income (ECI): If the LLC earns income that is effectively connected with a US trade or business, the foreign owner must file Form 1040-NR. This return requires an ITIN.
• US rental income: Foreign nationals who receive rental income from US real property must file Form 1040-NR, which requires an ITIN.
• Multi-member LLC partnerships: Each foreign partner in a US partnership (including multi-member LLCs taxed as partnerships) must have an ITIN to receive Schedule K-1 and to file any required US returns reporting their share of partnership income.
• Tax treaty claims: Claiming a reduced withholding rate under a US tax treaty requires the foreign party to provide Form W-8BEN with a valid ITIN — an EIN alone does not satisfy this requirement on an individual-level claim.

The Distinction Between EIN and ITIN

The LLC's EIN identifies the business entity for business-level tax purposes. An ITIN identifies the individual owner for individual-level obligations. These are separate identification numbers serving separate purposes. When an obligation falls at the individual level — such as signing a return, filing 1040-NR, or claiming a treaty benefit — the individual's own TIN (ITIN) is required, not the entity's EIN.

ITIN and US Tax Filing: What You Are Required to Report

Having an ITIN identifies you to the IRS but does not automatically create a US income tax liability. Whether you owe US tax depends on the nature and source of your income and your connection to the United States.

ECI: Effectively Connected Income

Effectively Connected Income is income derived from conducting an active trade or business in the United States. It includes income earned from:

• Services performed inside the United States
• Business operations with a US physical presence — office, employees, or inventory
• US real estate rental income (generally treated as ECI if you make the election on Form 4224)

ECI is taxed at the same graduated rates that apply to US citizens and residents. If you have ECI, you must file Form 1040-NR for every year in which that income is received.

FDAP: Fixed, Determinable, Annual, Periodic Income

FDAP income is passive US-source income: dividends from US corporations, interest from US bank accounts, royalties from US intellectual property, and certain US rents. FDAP income is subject to a flat withholding tax of 30%, deducted by the payer before the payment reaches you. The US tax treaty between your country of residence and the United States may reduce this rate — to 15%, 10%, 5%, or 0% depending on the treaty and type of income — but treaty benefits must be actively claimed by filing Form W-8BEN with the payer before income is paid.

When Your US LLC Has No US-Source Income

If your US LLC operates entirely outside the United States — no US employees, no US physical location, no US clients, no income sourced in the US — your federal income tax liability may be zero. However, you still have mandatory filing obligations:

• Form 5472 plus pro forma Form 1120: Filed every year regardless of whether the LLC has any income or activity whatsoever. The penalty for non-filing is $25,000 per return per year, with no minimum income threshold and no exception for inactive LLCs. The IRS has been actively assessing this penalty since the 2017 regulations took effect.
• FinCEN Form 114 (FBAR): If you have signature authority over one or more US bank accounts and the aggregate balance exceeds $10,000 at any point during the calendar year, you must file an FBAR electronically by April 15 (with an automatic extension to October 15).
• Form 1040-NR: May not be required if there is no ECI — but this determination should be confirmed with a qualified tax advisor given the complexity of the analysis.

How to Renew an Expired ITIN

ITINs are not permanent. They expire under two circumstances: (1) the ITIN was not used on a US federal tax return for three consecutive calendar years, or (2) the ITIN falls into one of the IRS-designated middle-digit ranges targeted for mass renewal.

Which ITINs Have Already Expired

• ITINs with middle digits 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, or 88: expired December 31, 2022
• ITINs with middle digits 90, 91, 92, 94, 95, 96, 97, 98, or 99 assigned before 2013: expired December 31, 2022
• Any ITIN not used on a US federal return filed for 2022, 2023, or 2024

Consequences of Filing or Transacting with an Expired ITIN

• The IRS will not process a tax return filed with an expired ITIN — it will be set aside until the ITIN is renewed
• The Child Tax Credit and American Opportunity Tax Credit will be disallowed, even retroactively if the ITIN was expired at time of filing
• Withholding agents who are aware your ITIN has expired may apply the full 30% withholding rate rather than any reduced treaty rate

How to Renew

Renewing an ITIN uses the same Form W-7 used for initial applications, with one important difference: write "Renew an Existing ITIN" across the top and include your current ITIN number in Box 6f. You do not need to attach a federal tax return for a renewal — this exception applies only to renewals, not to initial applications.

You will still need to provide identity documentation. A valid, unexpired passport is the simplest option. Filing your renewal through a Certifying Acceptance Agent (CAA) like SK Financial eliminates the risk of mailing your original passport and typically reduces processing time compared to mail submissions. ITIN Renewal: $200 all-inclusive.

Common ITIN Application Mistakes to Avoid

The IRS rejects a meaningful percentage of ITIN applications — not because the applicants are ineligible, but because of procedural errors that are entirely avoidable. Here are the most frequent mistakes and how to prevent each one.

Mistake 1: Submitting Copies Instead of Originals

The IRS requires either original documents or copies that are certified by the issuing authority — for example, a copy of your passport certified by your country's passport office or embassy. A notarized copy, no matter how official it appears, is not an acceptable substitute. The only way to avoid sending original documents to the IRS is to work through a Certifying Acceptance Agent (CAA), who is authorized to review and certify original documents in person without them leaving your possession.

Mistake 2: Submitting W-7 Without the Required Tax Return

In most cases, Form W-7 must be submitted as part of a complete tax return package — the return is attached to the W-7 before mailing. Common errors include submitting the W-7 alone, submitting an unsigned return, or attaching a return with TIN placeholders that do not match the information on the W-7. The IRS will reject incomplete packages in their entirety.

Mistake 3: Name Inconsistencies Between Documents

Your legal name on Form W-7 must match your name exactly as it appears on your passport or other primary identity document. Differences in middle name inclusion, hyphenation of surnames, or the ordering of given and family names — which vary significantly by country — will trigger rejection. Always use your name exactly as it appears on your passport, even if that differs from how you customarily spell your name in English.

Mistake 4: Using an Outdated Version of Form W-7

The IRS periodically revises Form W-7. Prior versions become obsolete on specific dates published in the form's instructions. Submitting a version that has been superseded results in automatic rejection. Download Form W-7 directly from IRS.gov each time you prepare an application — do not reuse a form from a prior year.

Mistake 5: Applying for an ITIN You Already Have

If you previously applied for and received an ITIN — even many years ago and even if you have not used it since — the IRS already has that number associated with your identity. Submitting a new application creates a duplicate record, which the IRS will identify and reject. If you are uncertain whether you have an existing ITIN, contact SK Financial to research your IRS records before filing a new application.

Mistake 6: Mailing to the Wrong Address

ITIN applications by mail go to a specific processing address at the IRS Austin Service Center, which is different from the addresses used for regular tax return filings. Sending your package to the wrong IRS address will not cause a formal rejection, but it may add weeks to the processing timeline as the IRS reroutes your documents internally.

SK Financial's ITIN service addresses all of the above. As a Certifying Acceptance Agent, we verify your eligibility, prepare Form W-7 correctly with the current version, authenticate your identity documents in person, and submit your application directly to the IRS — eliminating the risk of your passport being lost in transit and significantly reducing processing delays.