The Non-Resident Guide to Obtaining an ITIN for US Business

For international entrepreneurs entering the United States business ecosystem, tax identification numbers can be a significant source of confusion. The IRS issues several types of identification numbers, and using the wrong one can lead to delayed business setups, bank account rejections, and compliance errors. One number that frequently causes confusion is the Individual Taxpayer Identification Number, or ITIN.

An ITIN is a nine-digit tax processing number issued by the Internal Revenue Service (IRS) to individuals who are required to have a US taxpayer identification number but who are not eligible to obtain a Social Security Number (SSN) from the Social Security Administration. This includes foreign nationals, non-resident aliens, and their dependents. The core purpose of the ITIN is to allow individuals without an SSN to comply with US tax laws and file individual tax returns, regardless of their immigration status or residency.

An ITIN is a personal tax identification number issued by the IRS for non-residents who do not qualify for a Social Security Number.

To avoid compliance issues, founders must understand the difference between an Employer Identification Number (EIN) and an Individual Taxpayer Identification Number (ITIN). These numbers serve entirely different legal purposes and apply to different levels of your corporate structure.

Employer Identification Number (EIN)

An EIN is a business-level identification number. It is the corporate equivalent of an SSN, used by the IRS to identify a business entity. You need an EIN to open a US commercial bank account, apply for business credit cards, hire employees, register for state sales tax, and set up payment gateways like Stripe or PayPal Business. Any business entity (LLC, C-Corp, Partnership) can obtain an EIN, and the IRS does not require the company owners to have an SSN or ITIN to issue an EIN.

Individual Taxpayer Identification Number (ITIN)

An ITIN is a personal-level identification number. It is issued to you as an individual human being, not to your business entity. The IRS uses the ITIN to track personal tax liabilities, process individual tax returns (Form 1040-NR), and verify tax treaty benefits. While your LLC uses its EIN to file corporate information returns, you must use your ITIN if you are required to file a personal tax return to report US source income.

For most foreign entrepreneurs, an EIN is sufficient to run a US LLC. You do not need an ITIN to open a Mercury bank account, connect to Stripe, or receive e-commerce payouts. However, specific operational scenarios require obtaining an ITIN:

Filing Personal US Tax Returns

If your LLC has "effectively connected income" (ECI) from US sources, the LLC itself is typically a pass-through entity, meaning the tax liability passes directly to you as an individual. To report this income and pay any personal US income taxes owed, you must file IRS Form 1040-NR (U.S. Nonresident Alien Income Tax Return). The IRS will not process an individual tax return without a valid SSN or ITIN. Filing without one can result in withholding penalties and interest.

Claiming Tax Treaty Benefits

If you receive US-sourced passive income (such as royalties from book sales on Amazon KDP, advertising revenue from YouTube/Google AdSense, or dividends from US stocks), US payers are statutory required to withhold a flat 30% of your gross payments for tax purposes. However, if your home country has a bilateral tax treaty with the United States, you can submit Form W-8BEN to claim a reduced withholding rate (often 0% to 15%). To make a valid tax treaty claim on Form W-8BEN, you must provide your ITIN (or in some cases, your foreign tax identification number).

Opening Personal US Bank Accounts Remotely

While business neobanks like Mercury allow remote setup with only an EIN and passport, traditional US brick-and-mortar retail banks (like Chase, Citibank, and Bank of America) require a Social Security Number or ITIN to open personal checking or savings accounts online. If you want to establish a personal financial presence in the US, an ITIN is practically mandatory.

Building a US Credit Score

Building personal credit in the US allows you to secure premium personal and business credit cards (such as the Chase Sapphire Preferred or American Express Gold) which offer valuable travel rewards and high credit limits. US credit bureaus (Equifax, Experian, TransUnion) track credit history using SSNs or ITINs. Obtaining an ITIN allows you to apply for credit cards, start building credit, and eventually qualify for favorable financing rates.

The ITIN application process is notoriously strict. The IRS rejects over 30% of W-7 applications due to minor documentation errors, making it critical to follow the official guidelines precisely.

Preparing IRS Form W-7

The core of the application is Form W-7 (Application for IRS Individual Taxpayer Identification Number). You must select your reason for applying from the options listed on the form. For business owners, the typical reason is "Non-resident alien required to obtain ITIN to claim tax treaty benefit" (Box a) or "Non-resident alien filing a U.S. federal tax return" (Box h). You must fill out your legal name, foreign address, birth details, and passport information accurately.

Verifying Your Identity and Foreign Status

The IRS requires original documents to verify your identity and foreign national status. A valid, unexpired international passport is the only document that satisfies both requirements simultaneously. You have three options to submit your passport to the IRS:

• Option 1: Mail Original Passport: You can mail your actual physical passport along with Form W-7 to the IRS processing center in Austin, Texas. The IRS will review your passport and mail it back to you within 60 to 90 days. We highly discourage this method, as passports can be lost in transit, and you will be left without travel documents for months.
• Option 2: Certified Copies from Issuing Agency: You can contact your passport-issuing government agency (such as your local passport office or embassy) to request a certified copy of your passport. This certified copy must show the official agency stamp. Regular notarized copies from local notary publics are rejected by the IRS.
• Option 3: Use a Certifying Acceptance Agent (CAA): An IRS-authorized CAA is a professional (often a CPA, lawyer, or specialized service provider) authorized by the IRS to verify your identity documents. You can meet with a CAA via a video call, present your physical passport, and they will sign a Form W-7 (COA - Certificate of Accuracy). They will then submit the application package directly to the IRS, allowing you to keep your physical passport. This is the safest and most convenient option for international founders.

The Tax Return Attachment Rule

In most cases, the IRS will not issue an ITIN unless you attach a completed, original US federal tax return (such as Form 1040-NR) to your Form W-7. However, there are several "Exceptions" to this rule. The most common is **Exception 1(d) - Passive Income - Treaty Benefits**. Under this exception, you can apply for an ITIN without filing a tax return if you provide proof of passive US source income (such as a letter from Amazon KDP or YouTube verifying your creator account) alongside your Form W-7.