ITIN for Non-Resident Alien: Tax ID Guide

What Is a Non-Resident Alien?

The IRS defines a non-resident alien (NRA) as any individual who is not a US citizen and does not pass either the green card test or the substantial presence test. This classification is purely for tax purposes and is separate from your immigration status. You can hold a valid US visa and still be considered a non-resident alien for federal tax filing.

The substantial presence test uses a weighted formula based on your physical days in the United States over a three-year period. It counts all days present in the current year, one-third of days in the prior year, and one-sixth of days two years back. If the total reaches 183 or more, you meet the test and are treated as a resident alien. If it falls below 183, you remain a non-resident alien.

Understanding your NRA status matters because it determines which tax forms you use, which income the US can tax, and whether you are eligible for certain deductions and credits. Non-resident aliens file Form 1040-NR instead of Form 1040, and the US only taxes their US-source income rather than their worldwide income. For a broader look at how ITINs apply to all non-residents, see our ITIN for non-residents guide.

Why Non-Resident Aliens Need an ITIN

The IRS requires a taxpayer identification number on every tax return, withholding form, and information document filed with the agency. For US citizens and permanent residents, that number is a Social Security Number. For non-resident aliens who are not eligible for an SSN, the ITIN is the only alternative.

Here are the most common situations where an NRA needs an ITIN:

• Filing Form 1040-NR to report US-source income such as rental income, business profits, or capital gains from US real property
• Claiming tax treaty benefits by submitting a W-8BEN to a US payer to reduce or eliminate withholding
• Receiving US investment income such as dividends, interest, or royalties subject to reporting
• Being claimed as a spouse or dependent on a US taxpayer's return
• Opening US financial accounts that require a taxpayer identification number for compliance
• Selling US real property and needing to file for FIRPTA withholding adjustments

Not sure if you qualify? Our who needs an ITIN page walks through every scenario in detail.

NRA Tax Obligations in the United States

Non-resident aliens are subject to US tax on two categories of income: effectively connected income (ECI) and fixed, determinable, annual, or periodical (FDAP) income. Each category is taxed differently, and understanding the distinction is critical for proper compliance.

Effectively connected income (ECI): This includes income from a US trade or business, rental income from US real property (when you make the net income election), and wages for services performed in the US. ECI is taxed at graduated rates, the same brackets that apply to US residents. You report ECI on Form 1040-NR and can claim deductions directly related to earning that income.

FDAP income: This includes US-source dividends, interest, royalties, pensions, and certain other payments. FDAP income is taxed at a flat 30% rate through withholding at the source, unless a tax treaty reduces the rate. Your ITIN allows you to submit a W-8BEN to the payer, which triggers any applicable treaty rate reduction.

For a deeper look at filing requirements, see our guide on ITIN tax returns and Form 1040-NR.

Form 1040-NR: The NRA Tax Return

Form 1040-NR is the primary tax return for non-resident aliens. It looks similar to the standard Form 1040 but has important differences in what income you report, which deductions you can claim, and how your tax liability is calculated.

What you report: Only US-source income goes on Form 1040-NR. This includes wages earned in the US, rental income from US property, US business income, capital gains from selling US real estate, and FDAP income like dividends and royalties. Income earned entirely outside the US is not reported.

Available deductions: NRAs can deduct expenses directly connected to their US-source income. For rental properties, this includes mortgage interest, property taxes, depreciation, repairs, insurance, and management fees. For business income, you can deduct ordinary and necessary business expenses. However, NRAs cannot claim the standard deduction and are limited in which itemized deductions they can use.

Filing deadlines: If you received wages subject to US withholding, the deadline is April 15. If you did not receive such wages, you get an automatic extension to June 15. You can request a further extension to October 15 by filing Form 4868. Late filing penalties are 5% of the unpaid tax per month, up to 25%.

Your ITIN on the return: Enter your ITIN in the Social Security Number field at the top of Form 1040-NR. If you are applying for an ITIN and filing your first return at the same time, you attach the return to your Form W-7 application and the IRS processes both together. Once the ITIN is assigned, the IRS applies it to your return automatically.

How to Apply for an ITIN as a Non-Resident Alien

The ITIN application process follows the same general steps regardless of your residency status, but NRAs have some specific requirements and options to be aware of. Here is the full process from start to finish.

For a full explanation of what an ITIN is and how it works, visit our what is an ITIN page.

Tax Treaty Benefits for Non-Resident Aliens

The United States has income tax treaties with over 60 countries. These treaties are designed to prevent double taxation and often reduce the US withholding rate on certain types of income paid to residents of treaty countries. Your ITIN is the key that unlocks these benefits.

How treaty claims work: When a US company or institution pays you income that is subject to withholding (such as dividends, interest, or royalties), they are required to withhold 30% by default. To claim a reduced treaty rate, you submit Form W-8BEN to the payer with your ITIN and the specific treaty article that applies. The payer then adjusts the withholding rate based on the treaty provision.

Common treaty benefits: Many treaties reduce the withholding rate on dividends to 15% or lower. Interest income is often reduced to 0% or 10%. Royalties vary by treaty but frequently qualify for reduced rates. Some treaties also exempt certain types of income entirely, such as pensions, scholarships, or income from independent personal services performed for a limited period.

Without an ITIN: If you do not have an ITIN, you cannot complete the W-8BEN form properly. The payer has no choice but to apply the default 30% withholding rate, even if your country has a treaty that would reduce it to 0%. This means you overpay on every single payment until you get your ITIN and submit the correct documentation.

Claiming retroactive treaty benefits: If you received US income with 30% withholding before getting your ITIN, you can file Form 1040-NR to claim the treaty rate and request a refund of the excess withholding. The IRS allows you to file amended or late returns for the three most recent tax years, so there is a window to recover overpaid taxes even if you delayed your ITIN application.

Common Mistakes Non-Resident Aliens Make

The ITIN process is straightforward, but NRAs frequently run into avoidable problems that delay their applications or create tax complications. Here are the most common mistakes and how to avoid them.

Filing with the wrong form: Some NRAs mistakenly file Form 1040 (the resident alien or citizen return) instead of Form 1040-NR. This can trigger IRS notices, delayed processing, and incorrect tax calculations. Always confirm your residency status before choosing a tax form. If you are an NRA, Form 1040-NR is the correct return.

Missing the tax return attachment: Unless you qualify for a specific exception, your ITIN application must include a completed federal tax return. Submitting Form W-7 without the required return is one of the top reasons the IRS rejects applications. Make sure your 1040-NR is complete and attached before mailing your package.

Sending original documents without using a CAA: If you mail your application directly to the IRS without using a Certifying Acceptance Agent, you must include original documents (like your passport) or certified copies from the issuing agency. The IRS returns originals after processing, but that means your passport is out of your hands for 7 to 14 weeks. Using a CAA avoids this entirely.

Ignoring the ITIN expiration rules: ITINs expire if they are not used on a federal tax return for three consecutive years. They also expire based on the middle digits of the number under the IRS rolling renewal schedule. If your ITIN expires, you need to renew it before you can use it again. Keep track of your ITIN usage and renewal timeline.

Not claiming treaty benefits: Many NRAs are entitled to reduced withholding rates under tax treaties but never claim them because they do not submit a W-8BEN. If your country has a treaty with the US, failing to claim treaty benefits means you are paying more tax than required. Get your ITIN and submit the W-8BEN as soon as possible.

Our ITIN Service for Non-Resident Aliens

We specialize in ITIN applications for non-resident aliens. Whether you are filing your first US tax return, setting up treaty benefits with a US payer, or opening a US financial account, our team handles the entire application process from document verification to IRS submission.

Here is what our service includes:

• Complete W-7 preparation with all required fields filled correctly for your NRA situation
• Certifying Acceptance Agent verification so you keep your original passport throughout the process
• Document review and organization to make sure everything meets IRS standards before submission
• IRS submission with tracking and regular status updates until your ITIN arrives
• 100% money-back guarantee if the IRS declines your application

Our Standard service costs $197 with 7 to 10 business day preparation. Our Express service costs $297 with 2 to 3 business day preparation and priority support. Both tiers include the same comprehensive application package and guarantee.

We have helped thousands of non-resident aliens from over 50 countries get their ITINs. Common clients include foreign investors with US rental properties, freelancers earning income from US platforms, international students with scholarship income, and spouses of US citizens or residents who need an ITIN for joint filing. Whatever your situation, the process follows the same proven steps.

Have questions about your specific case? Reach out via WhatsApp or start your application online. We respond to all inquiries within one business day.