The EIN Requirement for Croatian Substack Writers
Substack writers based in Croatia face a specific challenge when their earnings reach a point where U.S. tax reporting becomes necessary. While Substack itself handles some aspects of payment processing, Stripe payouts, which are common for international creators, often require a U.S. Employer Identification Number (EIN) for proper tax identification. Without an EIN, you may encounter issues with payment holds, incorrect tax withholding, or difficulties opening a U.S. business bank account. This situation is distinct from a U.S.-based business owner requiring an EIN; for you, it's primarily driven by the mechanics of international payment processing and U.S. tax law as it applies to non-residents earning U.S.-sourced income or utilizing U.S. payment platforms. The IRS Form SS-4 is the application for this crucial nine-digit federal tax ID.
When You Need an EIN as a Croatian Substack Writer
An EIN is generally required for non-resident alien individuals or foreign entities engaged in a U.S. trade or business, or those who have U.S. income that is subject to U.S. tax withholding. For Substack writers in Croatia, the primary trigger is often the payment processor, such as Stripe. Stripe mandates an EIN for payouts to international entities or individuals who do not have a U.S. Social Security Number (SSN) or Individual Taxpayer Identification Number (ITIN) and are conducting business that results in U.S. tax reporting obligations. Even if you don't have employees or a physical U.S. business presence, the nature of receiving payments through a U.S.-based platform like Stripe can create a U.S. tax nexus. You will need to file IRS Form SS-4, the application for an Employer Identification Number.
Required Documents for Non-Residents
To apply for an EIN as a non-resident of the United States, you will need specific documentation. The primary document is a completed IRS Form SS-4. Crucially, on line 7b of Form SS-4, where a Social Security Number (SSN) is requested, you must write 'Foreign' if you do not possess an SSN or an ITIN. The application must also include a passport of the responsible party applying for the EIN. While not always strictly required for the initial EIN application if you are a sole proprietor or single-member LLC without U.S. employees, having U.S. business formation documents can be beneficial. If you are operating as a U.S. LLC, an Operating Agreement and proof of formation are standard. You will also need a reliable U.S. mailing address for receiving IRS correspondence; this can often be a mail forwarding service.
The EIN Application Process and Timeline
Applying for an EIN as a non-resident involves a different process than for U.S. residents. Since you likely do not have an SSN or ITIN, you cannot use the IRS's online application portal, which is designed for those with U.S. taxpayer identification numbers. Instead, you must submit your completed IRS Form SS-4 via fax or mail. The IRS processing time for non-resident applications submitted this way is typically much longer than for U.S. applicants, ranging from 3 to 5 weeks. It is imperative to ensure all information on Form SS-4 is accurate and complete to avoid delays or rejections. The IRS will issue your EIN on an IRS Form CP-575, which is mailed to the address provided on your application.
Common Mistakes for Croatian Substack Writers
Croatian Substack writers often make specific errors when applying for an EIN. A very common mistake is incorrectly filling out line 7b of IRS Form SS-4. As a non-resident without an SSN or ITIN, you must write 'Foreign' in this field. Failing to do so, or leaving it blank, will cause your application to be rejected. Another pitfall is attempting to use the online application system, which is not available to individuals without an SSN or ITIN. Ensure your legal name and address details on Form SS-4 precisely match your passport and any other official documentation. Misspelling names or providing an incomplete address can lead to significant processing delays or the inability to receive the official confirmation document from the IRS.
The Certified Acceptance Agent (CAA) Advantage
For non-residents applying for an EIN, the process can be expedited through a Certified Acceptance Agent (CAA). A CAA is an individual or entity authorized by the IRS to assist non-residents in obtaining an EIN. Using a service like itin.net, which operates as a CAA, offers several advantages. A CAA can review your application for completeness and accuracy before submission, significantly reducing the risk of errors that lead to delays. More importantly, a CAA can often facilitate a faster processing time compared to the standard fax or mail submission for non-residents. This can shorten the typical 3–5 week wait to as little as 3–5 business days. This expedited channel is invaluable for Substack writers in Croatia who need their EIN promptly to manage their Stripe payouts and U.S. financial obligations.
Next Steps After Obtaining Your EIN
Once you receive your EIN confirmation from the IRS, you can proceed with setting up your business finances. This typically involves opening a U.S. bank account. Many U.S. banks require an EIN to open an account for a foreign individual or entity. Platforms like Mercury, Relay, or Brex often work with international founders. You will also need your EIN for any U.S. tax filings, such as Form 1040-NR if you owe U.S. income tax, or Form 5472 if you are operating a U.S. LLC and need to report certain transactions with a foreign owner. Review the pricing for EIN services at itin.net or contact us if you require assistance with the application process.
Practical tips
- Write 'Foreign' on line 7b of Form SS-4 if you do not have an SSN or ITIN. This is the most common error for non-residents.
- Do not use the IRS online EIN application. You must submit Form SS-4 via fax or mail, or through a Certified Acceptance Agent.
- Ensure your legal name on Form SS-4 exactly matches your passport details to avoid application rejection.
- Have a reliable U.S. mailing address, or a mail forwarding service, ready to receive IRS correspondence, including your EIN confirmation letter.
- Understand that the Croatia–U.S. tax treaty, effective from 2025, may affect your U.S. tax obligations, but it does not change the EIN application process itself.
Frequently asked questions
Can I get an EIN if I am a sole proprietor in Croatia and write on Substack?
Yes, as a non-resident sole proprietor operating a business that generates U.S. income or uses U.S. payment processors like Stripe, you can obtain an EIN by filing IRS Form SS-4. You will need to indicate 'Foreign' on line 7b if you do not have an SSN or ITIN.
How long does it take for a non-resident in Croatia to get an EIN?
For non-residents applying directly via fax or mail, the typical IRS processing time for Form SS-4 is 3 to 5 weeks. Using a Certified Acceptance Agent (CAA) can expedite this to as little as 3 to 5 business days.
Do I need a U.S. business address to get an EIN?
While you don't need to form a U.S. business entity, you do need a U.S. mailing address to receive IRS correspondence, including your EIN confirmation. Many non-residents use mail forwarding services for this purpose.
What if Stripe requires an EIN for my Substack payouts from Croatia?
If Stripe requires an EIN for your payouts, you must apply for one using IRS Form SS-4. This is a common requirement for international creators receiving payments through U.S.-based platforms. Applying through a Certified Acceptance Agent can speed up the process.
Will the U.S.-Croatia tax treaty affect my EIN application?
The U.S.-Croatia tax treaty primarily affects tax liabilities and withholding rates, not the process of applying for an EIN itself. You still need to follow the standard IRS procedures for non-residents applying for an EIN.
Can I use my ITIN to apply for an EIN?
If you have an ITIN, you can use it on line 7b of Form SS-4. However, if you do not have an ITIN or SSN, you must write 'Foreign' in that field. Having an ITIN may allow for online application in some specific circumstances, but for most non-residents applying for an EIN, the fax or mail method is required.
