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Illustration for an ITIN article aimed at Substack writers based in Vietnam
ITIN12 min read

How Substack writers from Vietnam Get an ITIN

Substack writers in Vietnam need an ITIN for U.S. tax compliance. Learn the specific requirements, application process, and common pitfalls for obtaining your ITIN.

Reviewed by , ITIN Specialist at itin.net.

Substack Writers in Vietnam Face Unique ITIN Requirements

Substack writers based in Vietnam often encounter a specific hurdle when it comes to U.S. tax compliance: the need for an Individual Taxpayer Identification Number (ITIN). Unlike U.S. citizens or residents, individuals without a Social Security Number (SSN) who have U.S. tax filing obligations require an ITIN. For those earning income through platforms like Substack, which facilitate U.S. dollar payments, this becomes a critical requirement for proper tax reporting and avoiding excessive withholding. The challenge for writers in Vietnam is amplified by the lack of a U.S. tax treaty, meaning a default 30% withholding rate applies to U.S.-sourced income unless specific U.S. tax forms are filed correctly. Obtaining an ITIN is the foundational step to addressing this withholding and ensuring compliance with IRS regulations. This process, while procedural, requires careful attention to detail to avoid delays or rejections.

When You Need an ITIN as a Substack Writer from Vietnam

An ITIN is mandatory if you are required to file a U.S. tax return but cannot obtain an SSN. For Substack writers in Vietnam, this typically arises from receiving payments directly from U.S.-based entities or platforms like Stripe, which process payments for Substack. These platforms are required by the IRS to report payments made to non-U.S. persons. Failure to provide a valid ITIN (or SSN) can result in a substantial backup withholding tax, often at a 30% rate, applied to your earnings. This withholding is mandated by Chapter 3 of the U.S. Internal Revenue Code concerning withholding of tax on foreign persons, particularly payments made to independent contractors. Therefore, if your Substack earnings originate from U.S. customers or are processed through a U.S. entity, you will likely need to file a U.S. tax return and, consequently, obtain an ITIN. Even if you believe your income is not U.S.-sourced, platform reporting requirements can necessitate an ITIN to avoid penalties and backup withholding.

Required Documentation for Your ITIN Application

Applying for an ITIN requires submitting IRS Form W-7, Application for IRS Individual Taxpayer Identification Number. This form collects personal information, including your name, foreign address, and the reason for needing an ITIN. Alongside Form W-7, you must provide original or certified copies of documents proving your identity and foreign status. The most commonly accepted document is a valid passport. If a passport is unavailable, other documents like a national identification card, birth certificate, or driver's license may be considered, but a passport is strongly preferred by the IRS. You will also need to include a U.S. tax return with your Form W-7, unless you qualify for an exception. For Substack writers, this typically means filing a Form 1040-NR, U.S. Nonresident Alien Income Tax Return, reporting your Substack earnings. Ensure all submitted documents are current and accurately reflect your legal name. Any discrepancies can lead to delays or rejection of your application.

The ITIN Application Process and Timeline

The ITIN application process involves several steps. First, complete IRS Form W-7 accurately, ensuring all fields are filled out. Next, prepare your U.S. tax return (typically Form 1040-NR for non-residents) that you will file concurrently with the W-7. You then choose your submission method. You can mail your original documents and tax return directly to the IRS, but this is generally not recommended due to the risk of losing originals and longer processing times. Alternatively, you can apply through a Certified Acceptance Agent (CAA). A CAA can verify your original identification documents, allowing you to submit copies with your W-7, and then forwards your application package to the IRS. The IRS typically processes ITIN applications within 5–10 business days when submitted via a CAA. Direct submissions to the IRS can take significantly longer, often 11–17 weeks, and may require follow-up. The IRS will issue a CP-565 notice to confirm your ITIN once approved.

Common Mistakes for Substack Writers in Vietnam

Substack writers based in Vietnam frequently make specific errors that delay or result in denial of their ITIN applications. A primary issue is incorrectly reporting U.S. income. Many writers assume their Substack earnings are not U.S.-sourced, but payments processed through U.S. entities like Stripe are generally considered U.S.-sourced for tax purposes. This leads to an incomplete or incorrect Form 1040-NR. Another common pitfall is failing to include a U.S. tax return with the Form W-7, unless an exception applies. Since Vietnam does not have a tax treaty with the U.S., claiming treaty benefits incorrectly on the W-7 is another frequent mistake; writers must indicate no treaty benefits apply. Mismatched names between identification documents and the W-7 are also a significant problem. Finally, mailing original documents directly to the IRS, rather than using a CAA, increases the risk of loss and significantly lengthens processing times, causing undue stress and potential issues with tax filing deadlines.

Benefits of Using a Certified Acceptance Agent (CAA)

Applying for an ITIN through a Certified Acceptance Agent (CAA), such as itin.net, offers distinct advantages for Substack writers in Vietnam. The most significant benefit is that a CAA can authenticate your original identification documents. This means you do not have to mail your original passport or other vital documents to the IRS, mitigating the risk of loss or theft. The CAA reviews your application package, including your Form W-7 and supporting documents, ensuring it is complete and accurate before forwarding it to the IRS. This review process significantly reduces the chances of application errors, which are a leading cause of ITIN rejections. Furthermore, the IRS generally processes applications submitted by CAAs more quickly, often within 5–10 business days, compared to direct mail applications which can take many weeks or even months. This expedited processing is crucial for meeting tax filing deadlines and avoiding backup withholding.

Next Steps After Obtaining Your ITIN

Once you receive your ITIN from the IRS, typically via a CP-565 notice, you can use it for all future U.S. tax filings. The primary next step is to provide your ITIN to your payment processor, such as Stripe, to update your tax information. This will stop any backup withholding and ensure accurate reporting of your income to the IRS. You will use this ITIN when filing your annual U.S. tax return. If you plan to form a U.S. business entity like a U.S. LLC, you might also need an EIN (Employer Identification Number), which is a separate process. Opening a U.S. bank account can also be facilitated with your ITIN. Review the itin.net pricing for our ITIN application services or contact us directly for personalized assistance to ensure your U.S. tax obligations are met efficiently.

Practical tips

  • Use your full legal name exactly as it appears on your passport for Form W-7 and your U.S. tax return.
  • Ensure your passport is valid and has not expired; the IRS requires current identification.
  • If you previously filed U.S. taxes or had an ITIN, use that existing number instead of applying for a new one.
  • Keep copies of all documents submitted with your ITIN application for your personal records.
  • Be prepared to file a U.S. tax return (Form 1040-NR) along with your Form W-7, as this is usually required for Substack writers.

Frequently asked questions

Can Substack writers in Vietnam get an ITIN without a U.S. visa?

Yes, a U.S. visa is not a mandatory requirement for obtaining an ITIN. The primary criteria for an ITIN are having a U.S. tax filing obligation and not being eligible for an SSN. Substack writers in Vietnam without a visa can still apply if they meet these conditions, using their valid passport as primary identification.

How long does it take to get an ITIN for a Substack writer in Vietnam?

When applying through a Certified Acceptance Agent (CAA), the process typically takes 5–10 business days for the IRS to process the application after submission. If you mail your application directly to the IRS, it can take 11–17 weeks or longer. Using a CAA significantly speeds up the process and reduces the risk of errors.

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

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) is for businesses, used to identify a business entity. Substack writers earning freelance income typically need an ITIN. If they form a U.S. business entity like a U.S. LLC, they would then need an EIN.

Do I need to file a U.S. tax return to get an ITIN as a Substack writer?

Generally, yes. To obtain an ITIN, you must submit IRS Form W-7 along with a completed U.S. federal income tax return for the year you are claiming the ITIN. For Substack writers in Vietnam, this is typically Form 1040-NR. There are limited exceptions to this requirement, but they do not usually apply to freelance income earners.

What if my passport is my only ID document for ITIN application?

A valid passport is the preferred identification document for Form W-7 applications. If your passport is your only valid form of identification, it can be used. A Certified Acceptance Agent (CAA) can review your original passport and certify it, allowing you to submit a certified copy with your application, avoiding the need to mail your original document to the IRS.

How does Vietnam's lack of a U.S. tax treaty affect my ITIN application?

Vietnam does not have a tax treaty with the U.S. This means you cannot claim reduced withholding rates on U.S.-sourced income under a tax treaty. On Form W-7, you must indicate that you are not claiming treaty benefits. Your U.S. tax return (Form 1040-NR) will reflect the standard 30% withholding rate on certain types of income unless specific exemptions apply, or you can use your ITIN to reduce this rate with proper documentation.

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