How to Apply for an ITIN from Poland in 2026

Direct answer: To apply for an ITIN from Poland, prepare Form W-7, attach a U.S. federal tax return unless you qualify for an IRS exception, include proof of identity and foreign status, and send the package to the IRS ITIN Operation in Austin, Texas or apply through an IRS-authorized Acceptance Agent or Certifying Acceptance Agent. If you self-file by mail, the IRS generally requires original documents or certified copies from the issuing agency, not ordinary notarized copies. For many Polish applicants, the practical decision is whether to mail a passport, obtain a certified passport copy, or use a Certifying Acceptance Agent so the passport does not have to be mailed to the IRS.

An ITIN is an Individual Taxpayer Identification Number issued by the IRS for people who need a U.S. taxpayer identification number but are not eligible for a Social Security number. It is mainly used for U.S. tax filing and reporting, but in practice it is also commonly useful for financial onboarding, banking, payment platform compliance, brokerage forms, credit-card files, and business administration. Each bank, card issuer, fintech platform, Stripe or PayPal workflow, and financial provider still applies its own rules, so an ITIN helps with identification but does not guarantee approval.

What you need#

Before applying from Poland, confirm that you actually need an ITIN. You usually apply when you have a U.S. tax filing or reporting requirement and cannot get an SSN. Common examples include a nonresident filing Form 1040-NR, a spouse or dependent listed on a U.S. tax return, a foreign investor receiving U.S.-source income, or a founder, freelancer, e-commerce seller, or LLC owner who needs U.S. tax documentation for withholding, payouts, or account setup.

Your ITIN application package normally has three core parts: Form W-7, a U.S. federal income tax return, and supporting documents. The IRS explains the current filing options and processing expectations on its official ITIN application page.

1. Form W-7#

Form W-7 is the ITIN application form. Complete it carefully using the applicant's legal name, foreign address, mailing address, date of birth, country of citizenship, and reason for applying. If a family is applying, each person needs a separate Form W-7.

Choose the reason box that matches your case. For example, a Polish nonresident with U.S.-source income may choose a nonresident reason, while a spouse or dependent may need a different box connected to the U.S. tax return. Do not guess. The reason selected on Form W-7 should match the tax return or the IRS exception documents included in the package.

2. U.S. federal tax return or exception documents#

Most first-time applicants attach Form W-7 to the front of a U.S. federal income tax return, usually Form 1040 or Form 1040-NR. If the applicant does not yet have an ITIN, the SSN or ITIN field on the return is generally left blank for that person. The IRS assigns the ITIN first, then processes the tax return.

Some applicants qualify for an exception to filing a tax return with Form W-7. These exceptions can apply in limited cases such as certain withholding, treaty benefit, mortgage interest, partnership, or information reporting situations. If you use an exception, include the specific supporting letter or document required by the IRS Table of Exceptions rather than a tax return.

3. Supporting documents#

Supporting documents must prove identity and foreign status. A valid passport is often the strongest single document because it can usually prove both. If you do not use a passport, you may need a combination of other documents, such as a national identification card, civil birth certificate, foreign driver's license, visa, or other IRS-accepted document depending on the applicant.

Important: For a mailed ITIN application, the IRS does not accept ordinary notarized document copies in most cases. It generally requires original documents or certified copies from the issuing agency. This distinction matters in Poland because a notary-certified photocopy is not the same thing as a passport copy certified by the passport issuing authority for IRS purposes.

Step-by-step: how to apply for an ITIN from Poland#

1. Confirm your ITIN reason. Decide why the ITIN is needed: tax return filing, U.S.-source income reporting, treaty claim, dependent or spouse filing, platform onboarding, LLC administration, or another U.S. tax-related requirement.
2. Check SSN eligibility first. If you are eligible for a Social Security number, you should not apply for an ITIN. The ITIN is for applicants who need a U.S. taxpayer identification number but are not eligible for an SSN.
3. Complete Form W-7. Enter the applicant's details exactly as they appear on the passport or identity document. Check the correct reason box and sign the form. For a child or dependent, make sure the proper authorized person signs.
4. Prepare the tax return or exception packet. Attach Form W-7 to the front of Form 1040, Form 1040-NR, or the relevant IRS exception documentation. If multiple family members need ITINs on the same return, attach each Form W-7 to the same tax return package.
5. Prepare supporting documents. Use a valid passport if possible. If filing by mail, decide whether you will send the original passport, obtain a certified copy from the issuing authority, use a U.S. Embassy or Consulate certification route if available, or work with a Certifying Acceptance Agent.
6. Choose the filing method. Polish applicants can apply by mail to the IRS, apply through an IRS-authorized Acceptance Agent or Certifying Acceptance Agent, or apply in person at a U.S. IRS Taxpayer Assistance Center if they are physically in the United States.
7. Send or submit the application. Keep copies of the completed W-7, tax return, courier receipt, and every supporting document for your records. If using mail from Poland, use a trackable service.
8. Wait for IRS notices. The IRS generally says to allow 7 weeks for ITIN status, and 9 to 11 weeks during peak season from January 15 to April 30 or when applying from overseas.

Apply by mail#

Applying by mail is the direct self-filing route. You place Form W-7, the U.S. tax return or exception documents, and supporting identity documents in one package and send it to the IRS ITIN Operation. Use the IRS address for ITIN applications, not the normal Form 1040-NR tax return mailing address.

If using the U.S. Postal Service address format, the IRS lists the ITIN Operation at Austin Service Center, P.O. Box 149342, Austin, TX 78714-9342. If using a private delivery service, the IRS lists a separate street address for ITIN Operation, Mail Stop 6090-AUSC, 3651 S. Interregional Highway 35, Austin, TX 78741-0000. From Poland, applicants usually use an international courier or postal service that provides tracking and delivery confirmation.

The main benefit of applying by mail is control. You can prepare the package yourself and send it directly. The main risk is document handling. If you mail an original passport, you may be without it while the IRS processes the application and returns supporting documents. The IRS says mailed supporting documents are returned to the mailing address on line 2 of Form W-7, and document return can take up to 60 days.

For a practical mailing checklist, see this guide on mailing documents to the IRS with tracking and proof.

Apply in person#

Applying in person can reduce the risk of mailing original documents. There are several in-person routes, but not all are equally useful for someone located in Poland.

A Certifying Acceptance Agent is often the most practical choice for applicants outside the United States. A CAA can help complete and review Form W-7, authenticate many supporting documents, submit the ITIN package, and help resolve IRS questions. If you want to compare options, read this Taxsym guide to finding a certified acceptance agent for an ITIN application.

Taxsym's IRS-certified acceptance agent network can help applicants complete the ITIN process online from Poland, including Warsaw, Krakow, Gdansk, Wroclaw, Poznan, and Lodz. This is especially useful for founders, consultants, international students, remote contractors, investors, and online sellers who need an ITIN for U.S. tax filings or financial onboarding but do not want to mail their passport internationally.

Where to get a certified passport copy for an ITIN application from Poland#

If you apply by mail and send an original passport, there is a real risk of loss, damage, or return delay. Many applicants therefore look for a certified-copy route. For ITIN purposes, the key issue is not whether a copy is "official-looking"; it is whether the IRS will accept the certification source.

Option 1: Polish passport issuing authority#

• Authority name: Republic of Poland passport issuing authority through Polish consular offices
• Use case: Self-filers who want a passport copy certified by the same authority that issues the passport
• Source link: Passport for an adult - Poland in US

The official Polish passport guidance states that a passport application can be filed in any Republic of Poland consular office and that the passport is collected from the same office. For an ITIN application, contact the relevant passport authority or consular office before relying on this route, and ask whether they can provide a certified passport copy suitable for an IRS Form W-7 package.

Option 2: U.S. Embassy in Warsaw#

• Authority name: U.S. Embassy in Warsaw
• City: Warsaw
• Address: Aleje Ujazdowskie 29/31, 00-540 Warsaw, Poland
• Phone: +48 22 504 2000
• Source link: U.S. Embassy in Warsaw contact page

IRS instructions say officers at U.S. embassies and consulates overseas may provide certification and authentication services, but availability is not automatic. Treat the U.S. Embassy in Warsaw as a place to verify current document certification or notarization service availability, not as a guaranteed ITIN document-certification route.

Important: Confirm the latest IRS document rules and current mission or issuing-authority service availability before applying. Passport-copy certification rules, appointment availability, and consular services can change.

After you apply#

The expected outcome is either an ITIN assignment notice, a request for more information, or a rejection notice. The IRS commonly uses CP565 when an ITIN is assigned, CP566 when more information is needed, and CP567 when the application is rejected. Keep these notices because banks, withholding agents, tax preparers, and financial platforms may ask for proof of the ITIN later.

If your application is approved, use the ITIN on future U.S. tax filings and relevant tax forms such as W-8BEN when appropriate. If you later become eligible for an SSN, you should generally use the SSN going forward and update IRS records. For background, see this guide on how people may move from an ITIN to an SSN with the IRS.

If the IRS sends CP566, respond with exactly what the notice asks for. Do not send unrelated documents. If the IRS sends CP567, review the rejection reason before reapplying. Common rejection causes include an unsigned Form W-7, mismatched names, missing tax return, wrong exception support, unclear document copies, or documents that were notarized instead of certified by the issuing agency.

Common mistakes#

• Mailing the tax return to the wrong IRS address. When Form W-7 is attached, the package goes to the ITIN Operation, not the normal tax return filing address.
• Using a normal notarized passport copy. For most applicants, the IRS requires original documents or certified copies from the issuing agency, not a notary copy.
• Choosing the wrong Form W-7 reason box. The reason must match the applicant's tax position and supporting documents.
• Forgetting to sign Form W-7. An unsigned application can be rejected even if the supporting documents are correct.
• Sending a weak exception package. If you apply without a tax return, include the exact documentation required for the exception.
• Expecting fast processing from overseas. Overseas applications can take 9 to 11 weeks, especially during the January 15 to April 30 peak season.
• Not tracking mailed documents. Always keep copies and use a trackable mailing method from Poland.

Evidence-backed checklist#

The IRS process is strict because the ITIN is a federal taxpayer identification number. The evidence from official guidance is clear: Form W-7 must be complete, the tax return or exception documentation must support the reason for applying, and identity documents must be originals or properly certified copies. A passport is often the simplest document because it can establish both identity and foreign status, but the copy rules are the part many self-filers get wrong.

For applicants in Poland, the practical sandwich is this: first, decide whether you want the lowest-cost self-filing route or the lower-document-risk assisted route; second, prepare the W-7, tax return or exception documents, and passport evidence according to IRS rules; third, use tracking, save copies, and monitor IRS notices after submission. This creates a cleaner record if the IRS asks for more information.

FAQ#

Can I apply for an ITIN from Poland without visiting the United States?#

Yes. You can apply from Poland by mail or through an IRS-authorized Acceptance Agent or Certifying Acceptance Agent. You do not have to travel to the United States just to submit Form W-7.

Do I need to mail my Polish passport to the IRS?#

Not always. If you self-file by mail, you may need to send the original passport or a certified copy from the issuing agency. Many applicants avoid mailing the original passport by using a Certifying Acceptance Agent or a certified-copy route that meets IRS rules.

How long does an ITIN application take from Poland?#

The IRS generally says to allow 7 weeks for ITIN status. It can take 9 to 11 weeks during peak season from January 15 to April 30 or when applying from overseas.

Can I apply for an ITIN without a U.S. tax return?#

Sometimes. Most applicants attach a U.S. federal tax return, but certain IRS exceptions allow Form W-7 without a return. If you use an exception, you must include the required evidence for that specific exception.

Can an ITIN help with a U.S. LLC, bank account, Stripe, PayPal, or payouts?#

Yes, it can be practically useful because many financial providers and platforms use tax identification numbers during onboarding and compliance checks. An ITIN is still an IRS-issued tax identification number, and each provider makes its own approval decision.

Is an ITIN the same as an EIN?#

No. An ITIN identifies an individual. An EIN identifies a business entity. A foreign founder may need both in different situations, for example an EIN for a U.S. LLC and an ITIN for personal U.S. tax filing or individual identification.

What happens if my ITIN application is rejected?#

The IRS usually sends a notice explaining the issue. Review the reason, correct the Form W-7, tax return, exception evidence, or supporting documents, and resubmit the package if you still need the ITIN.