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Illustration for an ITIN article aimed at Substack writers based in Argentina
ITIN15 min read

How Substack writers from Argentina Get an ITIN

Substack writers in Argentina need an ITIN for U.S. tax compliance. Learn the requirements, application process, and common pitfalls to secure your ITIN efficiently.

Reviewed by , ITIN Specialist at itin.net.

Substack Writers in Argentina Face Unique U.S. Tax Obligations

Substack writers based in Argentina who earn U.S. income face a specific compliance challenge: obtaining an Individual Taxpayer Identification Number (ITIN). Unlike U.S. citizens or residents eligible for a Social Security Number (SSN), non-residents earning income from U.S. sources, such as through platforms like Substack, are required by the IRS to obtain an ITIN. This 9-digit number is essential for filing U.S. tax returns and for entities like Stripe, which process your payments and report them to the IRS. Without an ITIN, you may face issues with payment processing, delayed payouts, or penalties. The process involves submitting IRS Form W-7 along with supporting documentation, which can be complex for those unfamiliar with U.S. tax procedures. This guide specifically addresses the nuances for writers in Argentina, considering the lack of a U.S.-Argentina tax treaty and common payment scenarios.

When You Need an ITIN as a Substack Writer from Argentina

An ITIN is generally required for Substack writers in Argentina when you earn income sourced from the United States. This includes revenue generated from subscriptions, paid newsletters, or any other monetization methods offered through the Substack platform that result in U.S. dollar payouts. Payment processors like Stripe are obligated to report these earnings to the IRS. To facilitate accurate tax reporting and to avoid potential issues with your payouts, Stripe and other similar services often require you to provide an ITIN. Even if your U.S. income is below a certain threshold, filing a U.S. tax return may be necessary to claim treaty benefits (though no such treaty exists between the U.S. and Argentina) or to recover any U.S. taxes withheld. For Substack writers, the trigger is typically the receipt of U.S. dollar payments for services rendered to a U.S. audience or through a U.S.-based platform.

Essential Documents for Your ITIN Application

To apply for an ITIN using IRS Form W-7, you must provide specific documentation to the IRS. The primary document required is proof of your foreign identity and, in many cases, your original tax return that necessitates the ITIN. For individuals in Argentina, the most commonly accepted identification document is a valid passport. Your passport serves as proof of identity and foreign status. In addition to your passport, you will likely need to submit your U.S. tax return (e.g., Form 1040-NR for non-resident aliens) that you are filing concurrently with the W-7. If you have a U.S. visa, it should also be included. Ensure all documents are originals or certified copies from the issuing agency. The IRS may also request other documents depending on your specific circumstances, such as birth certificates or national identification cards, but the passport is preferred and often sufficient for identity verification.

Navigating the ITIN Application Process

The ITIN application process involves several key steps. First, you must complete IRS Form W-7 accurately and thoroughly. This form collects personal information, your reason for applying for an ITIN, and your U.S. tax filing details. Once completed, you must gather your supporting documentation, primarily your valid passport and your U.S. tax return. You then have two primary options for submitting your application: mail the original documents directly to the IRS, or use the services of a Certified Acceptance Agent. The direct mail route can take significantly longer, and there's a risk of losing original documents. The typical timeline for processing an ITIN application through a CAA is much faster, often within 5–10 business days for the ITIN assignment, though the IRS processing times can vary. The CAA acts as an intermediary, verifying your documentation and submitting the application on your behalf.

Common Mistakes for Substack Writers from Argentina

Substack writers in Argentina often make specific errors when applying for an ITIN. A frequent mistake is failing to include the required U.S. tax return with Form W-7. The ITIN is assigned to enable tax filing, so the application must be accompanied by the relevant tax return. Another pitfall is submitting incomplete or inaccurate information on Form W-7, such as mismatched names between the form and your passport, or incorrect addresses. Some writers also mistakenly believe they can use an ITIN application to resolve issues with their payment processor directly, rather than understanding it's a tax identification number. Given there is no U.S.-Argentina tax treaty, claims for reduced withholding taxes based on a treaty are not applicable, and attempting to claim them would be an error. Lastly, mailing original identification documents directly to the IRS carries the risk of loss or damage, a risk mitigated by using a Certified Acceptance Agent.

Benefits of Using a Certified Acceptance Agent (CAA)

Applying for an ITIN through a Certified Acceptance Agent, such as itin.net, offers distinct advantages for Substack writers in Argentina. A CAA is an individual or entity authorized by the IRS to help applicants obtain ITINs. The primary benefit is that CAAs can verify your original identification documents, such as your passport, and then return them to you immediately. This means you do not have to mail your original, vital documents to the IRS. The CAA submits your completed Form W-7 and certified copies of your documentation directly to the IRS. This process significantly speeds up the ITIN assignment, with ITINs typically issued within 5–10 business days after application submission via a CAA. Furthermore, CAAs are trained to ensure your application is complete and accurate, reducing the likelihood of rejections due to common errors. This specialized assistance is invaluable for non-residents navigating the complexities of U.S. tax compliance.

Next Steps After Receiving Your ITIN

Once you receive your ITIN from the IRS, typically via mail on a CP-565 notice, you can use it for all future U.S. tax filings. This includes filing your annual U.S. non-resident tax return (Form 1040-NR) and providing it to payment processors like Stripe. Having an ITIN ensures that your U.S. income is reported correctly to the IRS, preventing potential penalties and enabling timely payment processing. If you plan to establish a U.S. business presence, such as a U.S. LLC, or open a U.S. bank account, an ITIN can also be a crucial document. For Substack writers in Argentina, securing an ITIN is a foundational step for managing your U.S. tax obligations effectively. Review the itin.net Standard Package for detailed service offerings, or contact us if you have specific questions about your situation.

Practical tips

  • Use the exact same legal name on your Form W-7 as it appears on your passport to avoid mismatches.
  • Ensure your passport is current and valid for the entire period you are applying for the ITIN.
  • Double-check that you have included a complete and accurate U.S. tax return with your Form W-7.
  • If you are applying as part of a tax return with a spouse or dependents, ensure all required documentation for each person is included.
  • Consider using a Certified Acceptance Agent to avoid mailing original identification documents to the IRS.

Frequently asked questions

Do I need an ITIN if I'm a Substack writer in Argentina and only receive payments in Argentinian Pesos?

If your Substack earnings are paid to you in Argentinian Pesos and are not considered U.S. sourced income, you likely do not need an ITIN for U.S. tax purposes. However, if you receive payments in U.S. Dollars or through a U.S.-based platform, even if converted to Pesos, it's generally considered U.S. sourced income requiring an ITIN.

How long does it take to get an ITIN if I apply through a Certified Acceptance Agent?

When you apply through a Certified Acceptance Agent (CAA), the ITIN assignment typically takes 5–10 business days from the date the IRS receives your application. This is significantly faster than mailing your application directly to the IRS, which can take several weeks or even months.

What is the difference between an ITIN and an EIN for a Substack writer?

An ITIN (Individual Taxpayer Identification Number) is for individuals who need to file U.S. taxes but cannot get an SSN. An EIN (Employer Identification Number), obtained via Form SS-4, is for businesses, not individuals. As a Substack writer operating as an individual, you will need an ITIN. If you were to form a separate U.S. business entity, like a U.S. LLC, that entity might need an EIN.

Can I use my Argentinian DNI (Documento Nacional de Identidad) as a primary ID for my ITIN application?

While the IRS accepts various identification documents, a valid passport is the preferred and most commonly used document for proving foreign status and identity when applying for an ITIN. Your Argentinian DNI may be accepted as a secondary identification document, but a passport is generally required as the primary proof of identity and nationality.

What happens if Stripe asks for my ITIN and I don't have one yet?

If Stripe requests your ITIN and you do not have one, your payments may be put on hold, or you might face increased tax withholding on your earnings. It is advisable to apply for your ITIN as soon as possible once you identify it as a requirement for your payment processor.

Do I need to file a U.S. tax return every year once I have an ITIN?

You are generally required to file a U.S. tax return if you have U.S. sourced income that exceeds certain thresholds, or if you are otherwise required to file by the IRS. Simply having an ITIN does not automatically obligate you to file annually if your income or circumstances do not meet the filing requirements. However, if your Substack earnings continue to be U.S. sourced, you will likely need to file each year.

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