Double tax treaty between Poland and Poland – key

A German investor channels royalties from a Warsaw-based subsidiary to a holding company in the Netherlands. A Ukrainian entrepreneur receives dividends from a Polish limited liability company while residing in Kraków. Both situations share one question: which country has the right to tax the income, and at what rate? The answer lies in Poland's network of double tax treaties – bilateral agreements that allocate taxing rights, prevent double taxation, and shape structuring decisions for every cross-border business operating in Poland.

Poland has concluded double tax treaties with over 80 countries, following the OECD Model Tax Convention framework. These treaties override domestic Polish tax law on residency, source taxation, and withholding rates, subject to the Principal Purpose Test introduced by the Multilateral Instrument (MLI). A foreign investor or Polish resident with cross-border income must identify the applicable treaty, verify residency certification requirements, and assess whether Polish domestic anti-avoidance rules apply before taking a treaty position.

This guide walks through the structure of Poland's treaty network, the key provisions that affect business decisions, the procedural steps for claiming treaty benefits, and the three most common scenarios where treaty analysis determines the outcome. It also addresses the interaction between treaties and Polish domestic instruments such as the Ulga IP Box (IP Box regime) and the family foundation framework introduced in 2023.

How does Poland's treaty network allocate taxing rights?

Poland's treaties follow the OECD Model closely. Each treaty assigns primary taxing rights to either the source state (Poland) or the residence state, depending on the income category. Dividends, interest, and royalties carry reduced Polish withholding tax rates – typically 5%, 10%, or 15% – compared to the standard domestic rate of 19% or 20%. Business profits of a foreign entity are taxable in Poland only if the entity maintains a permanent establishment (PE) here.

The National Court Register (KRS) and the Head Office of the National Revenue Administration (KAS) are the two Polish institutions most frequently engaged when treaty positions are challenged. The Polish Financial Supervision Authority (KNF) becomes relevant when treaty-resident entities operate in regulated sectors. Understanding which authority governs the income stream is a practical first step.

Treaty-reduced rates do not apply automatically. Polish withholding tax rules require the payer to obtain a valid certificate of tax residency from the payee before applying a reduced rate. From 2022, payers making annual payments exceeding PLN 2 million to a single foreign recipient must apply the full domestic rate first and then seek a refund, unless they obtain a special opinion from the Head of KAS confirming the reduced rate is available.

Dividend payments: treaty rates commonly range from 5% (where the recipient holds at least 10% of shares) to 15%
Interest: most treaties set a 5%–10% ceiling
Royalties: rates vary from 5% to 10%, with some treaties exempting certain categories
Capital gains: often taxable only in the seller's residence state, subject to real-property company rules

The MLI has modified many of Poland's treaties since 2019. Poland elected to apply the Principal Purpose Test (PPT) as its primary anti-avoidance standard. A treaty benefit is denied if obtaining that benefit was one of the principal purposes of an arrangement – even if the arrangement is technically compliant. Structures relying on treaty rates without genuine economic substance in the treaty-partner jurisdiction are at serious risk of challenge, with no refund available once the benefit is forfeited.

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

Claiming a treaty benefit involves four sequential steps: residency certification, beneficial ownership confirmation, the PLN 2 million threshold check, and – where relevant – a KAS opinion. Each step has a strict timeline. Missing the residency certificate before payment means the payer must withhold at the full domestic rate, and recovering the overpaid tax can take 6 to 12 months through a refund procedure before the competent tax office.

Residency certificates must be current – Polish practice treats a certificate as valid for the calendar year of issuance, though some tax offices accept certificates covering the prior 12 months. The certificate must confirm that the recipient is a tax resident of the treaty-partner state under that state's law. A certificate issued by a foreign authority in a non-standard format may be rejected, delaying the reduced-rate application by up to 90 days.

Beneficial ownership (BO) has become a substantive hurdle. Polish corporate income tax law, aligned with the OECD's BEPS Action 6 output, requires that the recipient of dividends, interest, or royalties be the actual economic owner of the income – not a conduit. Holding companies with minimal staff, no independent decision-making authority, and no genuine risk exposure routinely fail the BO test. The consequence is denial of the treaty rate and potential surcharges of up to 150% of the underpaid tax.

We secured a reversal of a withholding tax surcharge exceeding PLN 1.8 million for a technology client in the Mazowieckie region (autumn 2025). The tax authority had denied treaty benefits on royalty payments, citing insufficient beneficial ownership documentation. Presenting contemporaneous evidence of the recipient's economic substance reversed the decision at the appellate stage.

For payments above PLN 2 million per year to one recipient, the payer has two options: apply the full rate and file a refund claim within 6 months of year-end, or obtain a KAS opinion in advance. The KAS opinion procedure takes up to 6 months and requires a detailed submission on the recipient's substance, ownership structure, and the commercial rationale for the payment. It provides certainty but demands significant preparation.

How do treaties interact with IP Box, family foundations, and transfer pricing?

Three Polish domestic regimes intersect with treaty provisions in ways that create both planning opportunities and compliance traps. The IP Box regime, the family foundation, and transfer pricing rules each operate on a different axis, but all three affect how treaty-reduced rates apply in practice.

The IP Box regime reduces the effective Polish corporate income tax rate on qualifying IP income to 5%. Where a Polish company earns royalties from a foreign licensee in a treaty-partner country, the interaction is straightforward: Poland taxes the income at 5% under IP Box, and the source-state withholding (if any) is creditable. The complication arises when a foreign parent licenses IP to a Polish subsidiary and claims a treaty-reduced withholding rate on royalties flowing out of Poland. Transfer pricing rules require the royalty rate to reflect arm's length pricing, and the IP Box benefit at the Polish level cannot be used to justify an inflated royalty to a low-substance foreign licensor.

Family foundations, introduced under Polish law in May 2023, are treated as Polish tax residents. A family foundation receiving dividends from a foreign subsidiary will look to the applicable treaty to reduce source-state withholding. However, several treaty partners – particularly those with beneficial ownership clauses aligned to the OECD standard – may challenge whether a Polish family foundation qualifies as the beneficial owner of dividend income, given that its primary purpose is asset preservation rather than active business. This is an open question in Polish tax practice, with no binding ruling yet issued by the National Administrative Court (NSA).

Transfer pricing documentation requirements apply to related-party transactions exceeding PLN 10 million per year (for goods and financial transactions) or PLN 2 million (for services and other transactions). Where a Polish entity and a treaty-partner entity are related, the transfer pricing file must demonstrate that the pricing reflects economic substance – the same substance test that underlies the beneficial ownership analysis. Gaps between the two filings are a common audit trigger.

To discuss how IP Box or family foundation structures interact with your treaty position, email info@kordeckipartners.com.

Our team obtained a favourable advance pricing agreement for an IT client in Lower Silesia (spring 2026), confirming that royalty payments to a Dutch parent at a 7% rate were arm's length. The agreement also confirmed that the treaty-reduced withholding rate of 5% applied, providing 36 months of planning certainty for the group.

What are the three key business scenarios where treaty analysis is decisive?

Three recurring cross-border scenarios illustrate where treaty provisions determine the financial outcome. Each scenario involves a different income category, a different treaty mechanism, and a different procedural risk. Getting the analysis wrong in any of them forfeits benefits that cannot be recovered retroactively beyond the statutory 5-year limitation period.

Scenario 1 – Manufacturing group with German parent. A German holding company owns 100% of a Polish manufacturing subsidiary. The subsidiary pays annual dividends of EUR 3 million. Under the Poland-Germany treaty, the withholding rate is 5% where the parent holds at least 10% of the shares for at least 12 months. The saving over the domestic 19% rate is EUR 420,000 per year. To apply the 5% rate, the Polish subsidiary must hold a valid German residency certificate, confirm beneficial ownership, and – because the payment exceeds PLN 2 million – either apply the full rate and claim a refund or obtain a KAS opinion. Failing to plan the timing of the KAS opinion application (which takes up to 6 months) means the full rate applies for the first payment cycle, with cash-flow consequences for the group.

Scenario 2 – IT company licensing software to Poland. A Cyprus-registered company licenses software to a Polish distributor for PLN 4 million per year. The Poland-Cyprus treaty sets a 5% withholding rate on royalties. Post-MLI, the PPT applies. If the Cyprus company was established primarily to access the treaty rate – with no employees, no independent decisions, and no genuine IP development activity – the Polish tax authority will deny the 5% rate and assess the full 20% domestic rate, plus interest at 8% per annum. Substance requirements for IP-holding entities in Cyprus have tightened significantly since 2019. For guidance on how KSeF and digital invoicing requirements interact with cross-border royalty flows, see our analysis at What KSeF means for your business in Cyprus.

Scenario 3 – Foreign investor acquiring a Polish real estate company. A French investor sells shares in a Polish company whose assets consist primarily of real estate. Most of Poland's treaties now include a real-property company clause: if more than 50% of the company's asset value derives from Polish real estate, Poland retains the right to tax the capital gain. The gain is taxed at 19% in Poland. The investor's treaty residence certificate does not help here – the real-property company carve-out is explicit. Structuring the acquisition as an asset deal rather than a share deal changes the tax treatment entirely. For a comparison of deal structures, see Share deal vs asset deal – choosing the right M&A structure.

What should businesses prepare before taking a treaty position?

Treaty compliance is not a one-time exercise. Polish tax authorities conduct WHT audits on a rolling basis, and the statute of limitations runs 5 years from the end of the tax year in which the payment was made. A treaty position taken in 2024 can be challenged until the end of 2029. Businesses that rely on treaty rates without contemporaneous documentation face the full domestic rate plus interest, and potentially a 150% surcharge where the authority characterises the position as abusive.

The following checklist covers the minimum documentation standard for treaty-based WHT positions:

Current certificate of tax residency from the recipient (valid for the relevant tax year)
Beneficial ownership declaration signed by the recipient's management
Substance evidence: headcount, office lease, board minutes, financial statements of the recipient entity
Confirmation that the MLI applies to the relevant treaty and identification of the applicable PPT standard
For payments above PLN 2 million: KAS opinion or refund procedure timeline documented in advance

For a full overview of Polish tax compliance obligations, including transfer pricing and KSeF onboarding, visit our practice page at Tax – Poland.

Personal liability does not attach to WHT errors in the same way it does to insolvency failures, but management board members who authorise payments without adequate treaty documentation can face personal tax liability under Polish fiscal penal law – a consequence that is irreversible once a criminal tax proceeding is opened. Acting before the audit is the only way to preclude that outcome.

To receive an expert assessment of your company's treaty compliance position, contact info@kordeckipartners.com.

Frequently asked questions

Q: How long does it take to obtain a refund of over-withheld Polish WHT?

A: A refund claim filed with the competent Polish tax office is processed within 6 months of the filing date. In practice, tax offices frequently issue requests for additional documentation, extending the process to 9 or even 12 months. Filing a complete claim with all residency and beneficial ownership documents from the outset is the single most effective way to avoid delays. Interest accrues on the refund amount at the statutory rate from the date of the original overpayment.

Q: Does the MLI automatically modify all of Poland's tax treaties?

A: No. The MLI modifies a treaty only if both contracting states have listed that treaty as a "Covered Tax Agreement" and have made compatible elections. Poland has listed the majority of its treaties, but some bilateral agreements – including several with non-OECD partners – remain outside the MLI scope. Practitioners commonly assume all treaties have been updated, but verifying the specific treaty's MLI status is a necessary first step before advising on any cross-border structure.

Q: Can a Polish family foundation claim treaty-reduced withholding rates on dividends received from abroad?

A: A Polish family foundation is a Polish tax resident and is entitled to invoke applicable treaties in principle. However, the beneficial ownership analysis is unsettled. Several treaty partners treat the foundation's pass-through character – distributions to beneficiaries are not taxed at the foundation level until paid – as a reason to question whether the foundation is the economic owner of the dividend income. Polish tax authorities have not yet issued definitive guidance. Until binding rulings emerge from the National Administrative Court, the conservative position is to obtain an individual tax interpretation from the Director of the National Revenue Information Service (KIS) before relying on a treaty rate in this structure.

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 tax advisory, treaty compliance, 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.