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ITIN15 min read

ITIN Tips for Substack writers from Paraguay

Paraguayan Substack writers need an ITIN for U.S. tax reporting. Learn how to apply, required documents, and common pitfalls to ensure a smooth process.

Reviewed by , ITIN Specialist at itin.net.

Substack Writers in Paraguay Face Unique ITIN Requirements

Substack writers in Paraguay face a specific challenge when it comes to U.S. tax compliance, primarily due to how they receive payments. Unlike U.S. residents, you likely do not have a Social Security Number (SSN). However, platforms like Substack, especially when processed through U.S.-based payment processors like Stripe, may require you to provide a U.S. taxpayer identification number for accurate tax reporting. This is where the Individual Taxpayer Identification Number (ITIN) becomes essential. The ITIN is a 9-digit IRS tax ID for individuals who must file U.S. taxes but cannot obtain an SSN. Without it, you might face backup withholding on your earnings, significantly reducing your income. Understanding when and why you need an ITIN is the first step for Paraguayan creators earning U.S. income.

When You Need an ITIN as a Substack Writer from Paraguay

The primary trigger for needing an ITIN as a Substack writer based in Paraguay is receiving payments from U.S. sources that are subject to U.S. tax reporting. Stripe, a common payment processor for platforms like Substack, is obligated to report payments made to non-U.S. persons to the IRS. To do this correctly, they need your taxpayer identification number. If you do not provide an SSN or an ITIN, Stripe may be required to apply backup withholding at a rate of 24% on your earnings. This applies regardless of whether you have a U.S. tax filing obligation. Even if you do not owe U.S. taxes, the payment processor needs your ITIN for their own reporting compliance. Therefore, for Substack writers in Paraguay, obtaining an ITIN is often a prerequisite to receiving full, unwithheld payments from U.S.-based platforms.

Essential Documents for Your ITIN Application

Applying for an ITIN requires submitting specific documentation to the IRS. The core document is Form W-7, Application for IRS Individual Taxpayer Identification Number. This form collects your personal information and the reason for your ITIN application. Alongside the Form W-7, you must provide original identification documents or certified copies of them to prove your identity and foreign status. The IRS prefers a valid passport as the primary identification document. If a passport is not available, other documents like a birth certificate, national identity card, or foreign driver's license may be accepted, but they must be presented in combination with other supporting documents to meet the IRS requirements. You will also need to include a federal income tax return, unless you qualify for an exception. For many, this tax return will be your U.S. federal income tax return, such as Form 1040-NR, U.S. Nonresident Alien Income Tax Return, which you are filing along with your Form W-7 application.

The ITIN Application Process: Step-by-Step

The ITIN application process begins with completing Form W-7. This form requires accurate personal details, including your name, address, and the reason for needing an ITIN. For Substack writers in Paraguay, the reason is typically to comply with U.S. tax reporting requirements from payment processors. Once the Form W-7 is filled out, you must gather your original identification documents or certified copies, along with your U.S. federal income tax return. You then have two main options for submission. You can mail all original documents directly to the IRS Service Center in Austin, Texas. Alternatively, you can use the services of a Certified Acceptance Agent (CAA). A CAA can review your documentation, verify your identity documents, and forward your application to the IRS on your behalf. This typically speeds up the process and avoids the risk of mailing original documents.

Common Mistakes for Paraguayan Substack Writers

Substack writers in Paraguay often make specific errors when applying for an ITIN. A frequent mistake is failing to include a complete U.S. federal income tax return with the Form W-7. While there are exceptions for certain situations, most applicants must file a tax return. Another common pitfall is providing incomplete or inaccurate personal information on the Form W-7, especially regarding names that may differ slightly between identification documents. Mismatched names are a leading cause of rejection. Furthermore, some writers mistakenly believe they need an ITIN solely for tax filing purposes. However, payment processors like Stripe require it for their own reporting, even if you owe no U.S. tax. Ensure your application clearly states the correct reason for needing the ITIN, aligning with payment processor requirements.

Benefits of Using a Certified Acceptance Agent (CAA)

Utilizing a Certified Acceptance Agent (CAA) like itin.net offers distinct advantages for Substack writers in Paraguay applying for an ITIN. A CAA is authorized by the IRS to help applicants complete their Form W-7 and to verify original identification documents. This means you do not have to mail your original passport or other vital documents directly to the IRS, reducing the risk of loss or damage. The CAA performs a crucial role in authenticating your identity documents, sending certified copies to the IRS, which is often more convenient and secure. This verification process by a CAA can streamline the application, potentially leading to a faster processing time. When you use a service like itin.net, you gain peace of mind knowing your application has been reviewed and submitted correctly by an authorized agent, minimizing common errors that lead to delays or rejections.

Next Steps After ITIN Application

Once your ITIN application is submitted, the IRS will process it and issue your ITIN. The typical timeline for receiving your ITIN is between 5–10 business days when applying through a Certified Acceptance Agent. If you mail your application directly to the IRS, processing times can be significantly longer, sometimes several weeks or even months, especially during peak tax seasons. Upon approval, you will receive an official IRS notice, such as a CP-565, containing your ITIN. You should then provide this ITIN to your payment processor, like Stripe, to ensure future payments are not subject to backup withholding. If you are also considering forming a U.S. business entity or opening a U.S. bank account, your ITIN may be necessary for those processes as well. Review itin.net's ITIN application services here.

Practical tips

  • Use the exact same legal name on your Form W-7, your passport, and any other identification documents provided to the IRS. Any discrepancies can cause delays or rejection.
  • Ensure your U.S. federal income tax return is complete and accurate before submitting it with your Form W-7. Incorrect tax filings are a common reason for application denial.
  • If you are applying through a Certified Acceptance Agent, they will verify your original documents and send certified copies to the IRS. This avoids the risk of mailing your original passport.
  • Keep a copy of your submitted Form W-7 and all supporting documents for your records. This will be helpful if you need to follow up with the IRS or for future tax filings.
  • If you have previously filed a U.S. tax return or had any U.S. tax obligations, gather any previous IRS correspondence, as this may be relevant to your application or future tax matters.

Frequently asked questions

Do I need an ITIN if I'm a Substack writer in Paraguay and only receive payments from non-U.S. clients?

Generally, if your Substack earnings are processed through a U.S.-based payment platform like Stripe, they are considered U.S. source income for reporting purposes. Even if your subscribers are not in the U.S., the platform's U.S. nexus triggers the reporting requirement. Therefore, you will likely need an ITIN to avoid backup withholding by the payment processor.

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

When you apply through a Certified Acceptance Agent (CAA), the process typically takes between 5–10 business days. The CAA verifies your documents and submits your application, which streamlines the IRS processing. Applying directly to the IRS can take considerably longer.

Can I use my Paraguayan driver's license or national ID as proof of identity for my ITIN?

While the IRS prefers a valid passport, other identification documents may be accepted if they meet specific criteria. A Paraguayan national ID or driver's license might be acceptable as supporting documentation, but you will likely need to submit it along with other documents to prove your identity and foreign status. It is best to consult with a Certified Acceptance Agent to ensure your chosen documents meet IRS requirements.

What happens if I don't provide an ITIN to Stripe for my Substack earnings?

If you do not provide a valid U.S. taxpayer identification number (SSN or ITIN) to Stripe, they are generally required to withhold 24% of your earnings as backup withholding. This amount is sent directly to the IRS. You will receive less income, and you may have to file a U.S. tax return to claim a refund of any over-withheld tax.

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

For most applicants, yes, you must file a federal income tax return with your Form W-7 application. There are exceptions, such as for certain non-resident aliens claiming tax treaty benefits or students/scholars. As a Substack writer receiving U.S. income, you will likely need to file a U.S. tax return, such as Form 1040-NR, unless you qualify for a specific exception.

Since Paraguay does not have a U.S. tax treaty, does that affect my ITIN application?

The absence of a U.S. tax treaty between Paraguay and the United States does not directly impact your eligibility for an ITIN. The ITIN is a tax processing number. However, it means you cannot claim any special treaty benefits on your U.S. tax return that might otherwise reduce your U.S. tax liability. You will still need the ITIN for reporting purposes if you have U.S. source income.

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