Double tax treaty between Poland and Poland – key

A German investor routes dividends from a Warsaw subsidiary through a Luxembourg holding structure. A Ukrainian founder relocates to Poland mid-year. A Polish IT company licenses software to a related party in the Netherlands. In each case, the first question is the same: which tax treaty applies, and what does it actually require?

Poland has concluded over 90 bilateral double tax treaties (DTTs) based on the OECD Model Convention. Each treaty defines residence, allocates taxing rights over income categories, and sets withholding tax rates – typically 5–15% on dividends, 0–10% on interest, and 0–10% on royalties. To claim treaty benefits, a Polish-source payer must hold a valid certificate of residence from the beneficial owner and apply the correct treaty in the correct tax year.

This guide walks through the structure of Polish DTTs, the procedural steps for claiming relief, the three most common business scenarios, and the mistakes that trigger reassessment by the National Revenue Administration (Krajowa Administracja Skarbowa, KAS). It also covers how recent domestic changes – KSeF, the family foundation regime, and IP Box – interact with treaty obligations.

How does the Polish double tax treaty network work?

Poland's treaty network covers more than 90 countries. Each DTT is ratified by the Polish parliament and published in the Official Journal (Dziennik Ustaw), giving it the force of domestic law. Where a treaty conflicts with the Personal Income Tax Act (ustawa o podatku dochodowym od osób fizycznych, PIT Act) or the Corporate Income Tax Act (ustawa o podatku dochodowym od osób prawnych, CIT Act), the treaty prevails. That hierarchy is the foundation of every cross-border tax plan.

The Ministry of Finance (Ministerstwo Finansów) maintains the official list of treaties in force. The National Court Register (Krajowy Rejestr Sądowy, KRS) provides entity-level data relevant to residence verification. The Polish Financial Supervision Authority (Komisja Nadzoru Finansowego, KNF) oversees financial intermediaries who often act as withholding agents. Knowing which institution governs each step saves time when documentation requests arrive.

Most Polish DTTs follow the OECD Model closely, but deviations matter in practice. The Poland–Germany treaty caps dividend withholding at 5% for corporate shareholders holding at least 10% of capital. The Poland–Netherlands treaty applies a 0% rate on interest paid to banks. The Poland–UK treaty was renegotiated in 2006 and contains specific tie-breaker rules for dual residents. Each treaty must be read on its own terms.

A key structural feature is the "beneficial ownership" requirement. A conduit entity that lacks economic substance – for example, a Luxembourg holding with no employees, no decision-making authority, and no genuine risk – will not qualify as beneficial owner. KAS has disallowed treaty benefits in several reassessment cases on exactly this ground. The minimum substance threshold is not codified, but KAS practice suggests at least one full-time director and a genuine bank account in the treaty country.

What are the procedural steps for claiming treaty relief in Poland?

Claiming treaty relief is a three-stage process: documentation, withholding, and reporting. Each stage has a hard deadline. Missing any one of them exposes the payer to back-withholding at the domestic rate of 19% or 20%, plus interest at 8% per annum and potential surcharges. The process applies to every cross-border payment of dividends, interest, royalties, or service fees that could constitute a deemed royalty.

Stage one is documentation. Before making any payment, the Polish payer must obtain a certificate of residence (certyfikat rezydencji) issued by the tax authority of the recipient's country. The certificate must be dated within 12 months of the payment date. For payments exceeding PLN 2 million in a calendar year to a single recipient, the payer must also conduct a "due diligence" review – verifying beneficial ownership, substance, and the absence of artificial arrangements.

Stage two is withholding. The payer applies the treaty rate at source and remits the difference to the tax office within 7 days of the end of the month in which the payment was made. For payments above PLN 2 million, the payer may either apply a flat 19%/20% domestic rate and later claim a refund, or obtain a binding opinion (opinia o stosowaniu preferencji) from the Head of the National Revenue Administration (Szef KAS) confirming treaty eligibility. The opinion process takes up to 6 months.

Obtain a valid certificate of residence before payment
Verify beneficial ownership for payments above PLN 2 million
Apply the treaty rate and remit withholding within the statutory deadline
File the IFT-2R annual return by the end of February following the tax year
Retain documentation for 5 years from the end of the tax year

Stage three is reporting. The payer files form IFT-2R (for corporate recipients) or IFT-1R (for individuals) annually. These forms summarise all cross-border payments and the treaty rates applied. KAS uses IFT data to cross-reference against transfer pricing documentation and to select files for audit. Errors in IFT returns are one of the most common triggers for a KAS inquiry.

We secured a reversal of a back-withholding assessment exceeding PLN 1.8 million for a technology client in the Mazowieckie region (autumn 2025). The reassessment had been triggered by an IFT-2R filing that misclassified a software licence payment as a service fee, attracting a higher domestic rate. Correct treaty characterisation – royalties under the Poland–Ireland DTT at 10% – eliminated the surcharge entirely.

For a tailored strategy on withholding tax compliance and the PLN 2 million threshold procedure, reach out to info@kordeckipartners.com.

Which business scenarios create the highest treaty complexity?

Three scenarios generate the majority of KAS inquiries in cross-border structures. Understanding the risk profile of each – and the correct treaty response – is the difference between a clean audit and personal liability for the board members who signed the payment authorisations.

Scenario 1 – Manufacturing with a German parent. A Polish manufacturing subsidiary pays a management fee to its German parent. The Poland–Germany DTT allocates taxing rights over business profits to the state of the recipient's residence, provided the payment is at arm's length and the German entity has no permanent establishment in Poland. Transfer pricing documentation is mandatory when the transaction exceeds PLN 10 million annually. Without it, KAS may recharacterise the fee as a disguised dividend, applying the 15% dividend withholding rate rather than 0%.

Scenario 2 – IT company with IP Box and a Dutch licensee. A Polish IT company benefits from the IP Box regime (5% CIT on qualifying IP income) and licenses software to a Dutch affiliate. The Poland–Netherlands DTT sets royalty withholding at 5% for related parties. However, if the Dutch entity lacks substance, the anti-abuse clause in the treaty – reinforced by the Principal Purpose Test introduced under the OECD's BEPS Multilateral Instrument (MLI), to which Poland is a signatory – may deny the reduced rate. The domestic rate of 20% then applies. See our detailed analysis of what KSeF means for your business in Poland for how digital invoicing obligations interact with cross-border IP payments.

Scenario 3 – Foreign investor and the family foundation. A Ukrainian founder who has relocated to Poland and established a Polish family foundation (fundacja rodzinna) distributes assets to foreign beneficiaries. The family foundation is a new vehicle under Polish tax law – introduced in May 2023 – and most existing DTTs predate it. KAS has not yet issued a binding general ruling on whether foundation distributions qualify as "dividends" under treaty definitions. Until it does, each distribution requires individual analysis under the relevant treaty. Our practice covers this in detail through the Luxembourg tax structuring practice.

Our team obtained interim protection of a treaty refund claim exceeding EUR 800,000 for a Dutch investor's Polish subsidiary in Lower Silesia (spring 2026). The dispute centred on the beneficial ownership analysis for a royalty stream. Documenting the decision-making chain at the Dutch holding level was decisive.

What mistakes most often cost businesses their treaty benefits?

Treaty benefits are not automatic. They are a preference that KAS can – and does – withdraw when documentation is incomplete or the substance analysis fails. The most expensive mistakes share a common pattern: the commercial team structures the payment, the finance team makes it, and the tax team reviews it only when the audit notice arrives. By then, the 5-year assessment window is still open and the consequences are irreversible.

The first mistake is an expired or missing certificate of residence. A certificate issued in January 2024 does not cover a payment made in February 2025. KAS has assessed back-withholding on this ground alone – no substance issue, no anti-abuse argument, simply a certificate that was 13 months old. The fix is a calendar reminder set 11 months after each certificate is obtained.

The second mistake is mischaracterising the payment type. Royalties and service fees attract different treaty rates and different domestic rules. A payment for a software licence is a royalty under most Polish DTTs. A payment for customised software development may be a business profit. The distinction determines whether withholding applies at all. Polish tax law does not provide a bright-line rule; KAS applies a functional analysis that looks at what the payer actually receives.

The third mistake is ignoring the MLI filter. Poland ratified the MLI in 2018. The MLI modifies Polish DTTs by inserting the Principal Purpose Test and, for some treaties, a Limitation on Benefits clause. A structure that was treaty-compliant in 2017 may not be compliant today. Any review of an existing cross-border structure should start with checking which MLI provisions apply to the relevant treaty – information available from the OECD's MLI matching database. For employment-related treaty questions, the employment practice in Poland covers treaty tie-breaker rules for mobile employees and posted workers.

Transfer pricing is the fourth pressure point. Where related-party payments exceed PLN 10 million per transaction type per year, a local file is mandatory. KAS auditors routinely cross-reference IFT returns against transfer pricing files. A gap between the two – for example, a royalty declared in the IFT at 5% treaty rate but not documented in the local file – is an almost automatic trigger for a full audit.

Frequently asked questions

Q: How long does it take to obtain a binding opinion confirming treaty eligibility for a payment above PLN 2 million?

A: The Head of the National Revenue Administration has up to 6 months to issue a binding opinion (opinia o stosowaniu preferencji). In practice, opinions on straightforward structures with complete documentation are issued in 3–4 months. The fee for the opinion is PLN 2,000. During the waiting period, the payer must either withhold at the domestic rate and claim a refund later, or apply for a conditional exemption – a separate procedural track with its own requirements.

Q: Is it true that the PLN 2 million threshold applies per payment, not per year?

A: This is a common misconception. The PLN 2 million threshold under Polish withholding tax law is calculated per recipient per calendar year, aggregating all payments of the same category (dividends, interest, royalties, or service fees). A single payment of PLN 1.9 million is below the threshold. But if a second payment of PLN 200,000 is made to the same recipient later in the same year, the entire amount – including the first payment – is subject to the enhanced due diligence and flat-rate withholding regime. Retroactive adjustments are required.

Q: Can a Polish family foundation rely on a double tax treaty when distributing assets to a foreign beneficiary?

A: The answer depends on the specific treaty and the nature of the distribution. Most Polish DTTs were concluded before the family foundation was introduced into Polish tax law in May 2023. Treaty characterisation of foundation distributions – as dividends, other income, or a category not covered by the treaty – has not yet been settled by binding KAS rulings or court decisions. A tax advisor Warsaw-based or otherwise should conduct a treaty-by-treaty analysis before any distribution is made. Relying on an assumed treaty rate without that analysis carries the risk of back-withholding plus interest, with no avenue for retrospective correction once the assessment becomes final.

What to prepare before your first cross-border payment

Preparation before the first payment is far cheaper than remediation after an audit. The checklist below applies to any Polish entity making cross-border payments of dividends, interest, royalties, or fees under a double tax treaty.

Obtain a certificate of residence dated within 12 months of the intended payment date
Confirm the recipient's beneficial ownership status and economic substance
Identify the correct income category (dividend, interest, royalty, business profit) under the applicable treaty
Check whether the MLI has modified the treaty – particularly the Principal Purpose Test
For payments above PLN 2 million annually: prepare due diligence documentation or apply for a binding opinion

Specific cross-border structures – particularly those involving IP Box income, KSeF Poland invoicing obligations for digital services, or the new family foundation vehicle – require additional layers of analysis. Polish tax law on these points is still developing, and KAS audit practice is ahead of published guidance in several areas.

Your company's specific treaty position depends on the payment type, the recipient's jurisdiction, the transaction volume, and the MLI modifications in force. Waiting until a KAS inquiry arrives forfeits the ability to restructure proactively – that window closes the moment an audit is opened.

To receive an expert assessment of your cross-border payment structure and treaty compliance position, contact info@kordeckipartners.com.

KORDECKI & Partners is a law firm based in Warsaw and Krakow, advising business clients across 30 jurisdictions. Our team combines expertise in Polish and international law with a practical approach to double tax treaty compliance, withholding tax structuring, transfer pricing, and KSeF onboarding. We work with Polish entrepreneurs, foreign investors, and in-house legal teams. To discuss your situation, contact info@kordeckipartners.com.