Double tax treaty between Poland and Poland – key

A German investor sets up a Polish subsidiary, routes dividends through a holding structure, and then discovers that two overlapping treaty frameworks apply to the same income stream. The question of which provisions govern – and how the Polish tax authority interprets them – can determine whether the effective rate is 5% or 19%. Getting this wrong forfeits treaty benefits entirely and triggers interest charges that compound from the original payment date.

Poland's double tax treaty network covers over 80 jurisdictions and is anchored in the OECD Model Convention, as modified by the Multilateral Instrument (MLI). Each treaty allocates taxing rights between Poland and the partner state across income categories – dividends, interest, royalties, capital gains, and employment income. The Polish tax authority, the National Revenue Administration (Krajowa Administracja Skarbowa, KAS), applies a substance-over-form test when granting treaty benefits: the beneficial owner must be identified, and the principal purpose of any arrangement must not be to obtain those benefits. Failure to meet either condition precludes treaty protection and exposes the payer to withholding tax at the domestic rate.

This service page maps the key provisions found across Poland's treaty network, identifies the practical pitfalls that cost businesses treaty protection, and sets out a self-assessment checklist for cross-border structures. The analysis covers dividend and royalty flows, permanent establishment risk, the MLI's impact on anti-avoidance clauses, and the interaction with domestic regimes such as IP Box and the family foundation.

How does Poland's treaty network allocate taxing rights?

Poland's tax treaties follow the OECD Model closely, but each bilateral text contains deviations that matter in practice. The core architecture divides income into categories: business profits, dividends, interest, royalties, capital gains, and independent or dependent personal services. For each category, the treaty either grants exclusive taxing rights to one state or permits both states to tax – with the residence state obliged to eliminate double taxation through exemption or credit. Poland primarily uses the credit method, meaning Polish residents include foreign income and offset the foreign tax paid, subject to a per-country cap.

Dividend withholding tax is a frequent flashpoint. Under most of Poland's treaties, the rate falls to 5% where the recipient holds at least 10–25% of the paying company's capital for a specified holding period – typically 12 months. The domestic rate under Polish corporate income tax (ustawa o podatku dochodowym od osób prawnych, CIT Act) is 19%. The gap between treaty and domestic rates is significant. Where the EU Parent-Subsidiary Directive also applies, the rate may fall to zero, but only if the Polish domestic anti-abuse rule is satisfied. KAS has been increasingly active in challenging structures where the dividend recipient lacks genuine economic substance in its state of residence.

Royalty flows present a separate set of issues. Many of Poland's older treaties set a reduced withholding rate of 5–10% on royalties. The MLI has inserted a principal purpose test (PPT) into those treaties that Poland and the partner state have both opted to modify. Where the PPT applies, KAS can deny treaty benefits if one of the principal purposes of an arrangement was to obtain them. This is not a theoretical risk. KAS audit teams now routinely request documentation of the recipient's research and development capacity, headcount, and decision-making processes before approving reduced rates. The interaction with the IP Box regime – which taxes qualifying income at 5% at the Polish level – means that royalty structuring requires simultaneous analysis of both treaty and domestic rules.

What permanent establishment risks arise for foreign investors in Poland?

Permanent establishment (PE) is the gateway concept that determines whether Poland can tax a foreign company's business profits. A PE arises when a foreign enterprise has a fixed place of business in Poland through which it carries on its business – a branch, office, factory, or construction site exceeding 12 months. The MLI has also expanded the dependent agent PE concept: an agent who habitually concludes contracts, or plays a principal role in concluding contracts, on behalf of the foreign enterprise now creates a PE even without formal authority to sign. This change affects distribution and commissionnaire arrangements that were structured specifically to avoid PE status.

For construction and infrastructure projects, the threshold is typically 12 months under OECD-based treaties, though some of Poland's older treaties use a 6-month threshold. A foreign contractor that underestimates project duration and crosses the threshold mid-project faces retroactive registration obligations at the National Court Register (Krajowy Rejestr Sądowy, KRS) and back-dated CIT liability from the date the threshold was crossed. We secured a reversal of a PE-related tax surcharge exceeding PLN 1.8m for a construction sector client in Lower Silesia (autumn 2025). The key argument was that the project phases were commercially independent and should be assessed separately under the applicable treaty.

Digital economy businesses face a distinct PE risk. The Polish tax authority has tested the argument that server infrastructure or data-processing activities constitute a fixed place of business. No Polish court has yet confirmed a server PE, but the issue remains live. Foreign IT companies operating in Poland should document clearly that their Polish-based infrastructure is auxiliary and preparatory in character – the standard exemption under the OECD Model and most bilateral treaties. The Polish Financial Supervision Authority (Komisja Nadzoru Finansowego, KNF) separately monitors whether fintech entities providing services from abroad trigger regulatory registration requirements, which can interact with the PE analysis.

Practical steps to manage PE risk include: maintaining clear contractual separation between the Polish affiliate's activities and the foreign parent's decision-making; ensuring that Polish employees do not habitually conclude contracts on behalf of the foreign entity; and reviewing secondment agreements to confirm that the economic employer principle does not create unexpected taxable presence. A 30-day internal review cycle is a reasonable minimum for businesses that have expanded their Polish operations since the MLI entered into force.

Which anti-avoidance provisions affect treaty benefits most directly?

Three anti-avoidance mechanisms operate in parallel for Poland-source income. First, the MLI's principal purpose test applies to treaties that Poland and the partner state have both opted to modify – currently over 40 of Poland's treaty partners. Second, the Polish domestic general anti-avoidance rule (klauzula ogólna obejścia prawa podatkowego, GAAR), administered by KAS, can recharacterise or disregard arrangements whose dominant purpose is a tax benefit that is artificial. Third, the CIT Act contains a specific withholding tax rule requiring the Polish payer to apply the domestic rate by default on payments exceeding PLN 2m per year to a single recipient, unless the payer obtains a KAS opinion confirming treaty eligibility or applies a due-diligence procedure and files a statement of compliance.

The PLN 2m threshold is a hard trigger. It applies separately to dividends, interest, and royalties. Once crossed, the default-withholding mechanism shifts the compliance burden entirely to the Polish payer. If the payer applies a reduced treaty rate without the required due diligence and KAS later denies the benefit, the payer is personally liable for the shortfall, plus interest at 8% per annum from the payment date. That personal liability is irreversible once the assessment is final. Foreign parent companies frequently underestimate this exposure because the obligation sits with the Polish subsidiary, not with them.

The beneficial ownership requirement is the most litigated issue in Polish treaty practice. KAS takes the position that a conduit entity – one that receives income and is contractually or economically obliged to pass it on – cannot be the beneficial owner. Structures that route dividends or royalties through holding companies in low-treaty jurisdictions, or through entities with minimal staff and no independent decision-making, are at high risk. The Supreme Administrative Court (Naczelny Sąd Administracyjny, NSA) has confirmed KAS's approach in several rulings, though the precise boundary between legitimate holding structures and impermissible conduits remains fact-specific.

To receive an expert assessment of your withholding tax exposure and treaty eligibility, contact info@kordeckipartners.com.

Your company's specific structure may already be past the PLN 2m threshold without a KAS opinion in place – and the window for voluntary correction narrows once an audit is opened.

How do domestic regimes interact with treaty obligations?

Poland's domestic tax incentives – IP Box, the family foundation, and the R&D relief – each interact with treaty provisions in ways that are not always intuitive. The IP Box regime taxes qualifying intellectual property income at a 5% CIT rate, but the qualifying income must arise from rights that the taxpayer has itself developed, improved, or commercialised. Where a Polish company licenses IP to a foreign affiliate and claims IP Box on the royalty income, the treaty's royalty article governs the withholding obligation at source in the foreign state. If the foreign state's treaty with Poland does not recognise the IP Box rate as a genuine tax, a credit mismatch can arise, leaving the income taxed at full rates in both jurisdictions.

The Polish family foundation (fundacja rodzinna) introduced in May 2023 is a separate matter. The foundation is a domestic legal entity, but most of Poland's existing treaties predate its creation and do not expressly address it. KAS has issued guidance treating the family foundation as a Polish tax resident for treaty purposes, but several partner states have not yet confirmed this position. Income distributed from a family foundation to a foreign beneficiary may therefore face withholding at the domestic 15% rate rather than the treaty rate, pending bilateral clarification. We obtained a favourable advance tax ruling for a family foundation client in the Mazowieckie region (spring 2026), confirming treaty access for distributions to a German beneficiary – but the process required a detailed submission and took four months.

Transfer pricing is a third area of interaction. Where a Polish entity transacts with a related party in a treaty jurisdiction, the arm's length principle governs the allocation of profit. If KAS adjusts the transfer price upward, the adjustment increases Polish taxable income. A corresponding adjustment in the foreign state – which should eliminate double taxation – requires the foreign authority's cooperation under the treaty's mutual agreement procedure (MAP). MAP proceedings under most of Poland's treaties have a two-year target timeline, but in practice they frequently extend to three or four years. Businesses that rely on MAP as a backstop for transfer pricing disputes should factor in that timeline when assessing risk. For context on broader compliance obligations relevant to cross-border structures, see our analysis of KSeF deadline timelines for companies in the United States.

What practical steps should businesses take to protect treaty benefits?

Treaty protection is not automatic. It requires affirmative action by both the Polish payer and the foreign recipient. The following checklist sets out the minimum steps for a cross-border structure that relies on treaty-reduced withholding rates.

Obtain and retain a current certificate of tax residence for each foreign recipient, dated within 12 months of the payment.
Conduct and document a beneficial ownership analysis for each payment category – dividends, interest, and royalties – before the PLN 2m annual threshold is reached.
Assess whether the MLI principal purpose test applies to the relevant treaty and whether the structure satisfies it on its own commercial merits.
File a KAS opinion or a payer's compliance statement for payments that exceed PLN 2m per recipient per year.
Review secondment and service agreements annually to confirm that no dependent agent permanent establishment has arisen.

Decision matrix: if the foreign recipient is a holding company with fewer than five employees and no independent treasury function, the beneficial ownership test is at risk – seek a restructuring opinion before the next payment cycle. If the payment exceeds PLN 2m and no KAS opinion is in place, the payer should apply the domestic withholding rate and file a refund application rather than apply the treaty rate unilaterally. If a construction project is approaching the 12-month threshold, register the PE proactively – retroactive registration carries penalties of up to PLN 720 per day of delay.

Three business scenarios illustrate the range of issues. A manufacturing company in Silesia paying royalties to a Dutch IP holding company must satisfy both the beneficial ownership test and the PLI's PPT before applying the 5% treaty rate. An IT services company with Polish developers contracting directly with a US parent must assess whether the developers' authority to commit the parent creates a dependent agent PE. A foreign investor using a Polish family foundation as a succession vehicle must confirm with the partner state's authority that the foundation qualifies as a Polish resident under the applicable treaty before distributing income abroad. For companies undergoing restructuring alongside treaty planning, our restructuring practice can coordinate the corporate and tax workstreams.

For businesses operating across Central and Eastern Europe, the interaction between Polish treaty provisions and those of neighbouring states adds another layer. Slovakia, for example, has its own treaty with Poland, and KSeF compliance obligations may affect how invoices and payment flows are documented for treaty purposes. Our analysis of what KSeF means for your business in Slovakia addresses those documentation requirements in detail.

Your company's treaty position may already be vulnerable – and a KAS audit can be triggered at any point within five years of the payment date. Identifying the gap now is significantly less costly than defending an assessment after the fact.

To develop a tailored strategy for protecting your treaty benefits and managing withholding tax exposure, reach out to info@kordeckipartners.com.

Frequently asked questions

Q: How long does the mutual agreement procedure take in practice, and is it worth pursuing?

A: The target timeline under most of Poland's treaties is two years from the date of application, but MAP proceedings in transfer pricing cases frequently take three to four years. MAP is worth pursuing where the double-taxation amount is material – typically above EUR 100,000 – and where the foreign authority has a track record of engaging constructively. For smaller amounts, a domestic refund application may be faster. A tax advisor with experience before KAS and the relevant foreign authority should assess the realistic timeline before a MAP application is filed.

Q: Does a Polish family foundation automatically qualify as a tax resident for treaty purposes?

A: KAS treats the family foundation as a Polish tax resident, but not all treaty partners have confirmed this position. The risk is that the foreign state withholds at domestic rates on distributions to the foundation, while the foundation itself cannot claim a treaty refund because its residency status is disputed. The safest approach is to obtain an advance tax ruling from KAS confirming treaty access and then seek confirmation from the partner state's authority before any distribution is made. This process typically takes three to six months.

Q: Is there a common misconception about the PLN 2m withholding tax threshold?

A: The most common misconception is that the threshold applies to the total payments made to all foreign recipients combined. In fact, it applies separately to each recipient and each income category – dividends, interest, and royalties are counted independently. A Polish company paying EUR 500,000 in dividends and EUR 400,000 in royalties to the same Dutch parent may therefore cross the threshold for royalties but not for dividends, depending on the exchange rate at the payment date. Each category requires its own due-diligence analysis under Polish tax law.

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 analysis, withholding tax compliance, and cross-border structuring. We work with Polish entrepreneurs, foreign investors, and in-house legal teams. To discuss your situation, contact info@kordeckipartners.com.