Double tax treaty between Poland and Ukraine – key

A Ukrainian technology company sets up a Polish subsidiary to access EU markets. Dividends flow back to Kyiv. The founders ask one question: how much tax will Poland withhold? The answer depends almost entirely on the double tax treaty between Poland and Ukraine – a bilateral agreement that has governed cross-border income flows between the two countries for over two decades.

The double tax treaty between Poland and Ukraine allocates taxing rights over dividends, interest, royalties, business profits, and employment income. Under Polish tax law, the treaty reduces withholding tax on dividends from the standard 19% to 5% or 15%, depending on the shareholding threshold. Residency certificates and substance requirements must be met before any reduced rate applies.

This guide walks through the treaty's main provisions, the procedural steps for applying reduced rates, the three most common business scenarios where the treaty is invoked, and the mistakes that cause Polish tax authorities to disallow treaty benefits. It also addresses how the treaty interacts with recent changes to Polish tax law – including Klauzula Główna Przeciwko Unikaniu Opodatkowania (General Anti-Avoidance Rule, GAAR) and the beneficial ownership test.

What does the Poland–Ukraine double tax treaty cover?

The treaty between Poland and Ukraine entered into force in 1994. It follows the OECD Model Convention in structure, though with several deviations that matter in practice. The Ministry of Finance of Poland (Ministerstwo Finansów) administers treaty applications domestically. The National Revenue Administration (Krajowa Administracja Skarbowa, KAS) conducts audits when treaty benefits are claimed. The National Court Register (Krajowy Rejestr Sądowy, KRS) records the corporate structures that underpin most treaty claims.

The treaty covers the following income categories:

Dividends – reduced withholding tax of 5% (for holdings of at least 25%) or 15% (all other cases)
Interest – capped at 10% withholding tax
Royalties – capped at 10% withholding tax
Business profits – taxed only in the state of residence, unless a permanent establishment exists
Employment income – taxed in the state where work is performed

These rates replace the domestic Polish withholding rate of 19% for dividends and 20% for interest and royalties paid to non-residents. The difference is material. A Ukrainian shareholder receiving PLN 1m in dividends from a Polish company saves between PLN 40,000 and PLN 140,000 depending on the applicable treaty rate. That saving disappears if the procedural conditions are not met.

One deviation from the OECD model deserves attention. The treaty's royalty article uses a broad definition that covers payments for the use of industrial equipment – a category excluded from OECD royalties since 1992. This means that Polish companies paying Ukrainian counterparties for equipment leases may face a 10% withholding obligation that would not arise under newer treaties.

How does the beneficial ownership test affect treaty claims?

Polish tax law requires that the recipient of a dividend, interest, or royalty payment be the beneficial owner of that income. This is not merely a formality. KAS auditors routinely challenge treaty claims where the Ukrainian recipient passes funds upstream to a third country within a short period – sometimes as little as 30 days. Failure to satisfy the beneficial ownership test forfeits the reduced treaty rate and triggers the full domestic withholding tax, plus interest.

The beneficial ownership test under Polish tax law has three elements. First, the recipient must receive the income for its own account, not as a conduit. Second, the recipient must bear the economic risk associated with the income. Third, the recipient must not be obliged – contractually or in practice – to pass the income on to another party. A Ukrainian holding company that merely channels dividends to a Cyprus parent will not satisfy this test.

We secured a reversal of a withholding tax surcharge exceeding PLN 1.8m for a technology client in the Mazowieckie region (autumn 2025). The KAS audit had disallowed treaty benefits on the basis that the Ukrainian recipient lacked substance. We demonstrated that the recipient employed four staff, maintained its own bank accounts, and retained dividends for over 12 months before any upstream distribution. The decision was reversed at the first administrative stage.

Practically, a Ukrainian entity claiming treaty benefits should prepare a substance file before the first payment. This file should document: registered office and lease agreement, local employees and payroll records, bank account statements showing retained income, and board resolutions authorising receipt of the income. Preparing this documentation retroactively – after an audit begins – is significantly harder and rarely convincing.

What are the procedural steps for applying reduced withholding rates?

The procedure for applying a reduced treaty rate in Poland is specific and time-sensitive. The Polish payer – not the Ukrainian recipient – bears primary responsibility. If the payer applies the wrong rate, KAS assesses the shortfall against the payer directly. Personal liability of board members arises where the company cannot satisfy the assessment. This exposure concentrates minds.

The steps are as follows:

Obtain a valid residency certificate (certyfikat rezydencji) from the Ukrainian tax authority, dated no earlier than 12 months before the payment
Verify that the recipient is the beneficial owner of the income
For payments exceeding PLN 2m per year to a single recipient, obtain a formal opinion from the Head of KAS or apply for a withholding exemption ruling
File the WHT-1 or WHT-2 declaration with KAS within the statutory deadline
Retain documentation for five years from the end of the tax year in which the payment was made

The PLN 2m threshold is a hard trigger. Above it, the simplified "collect and pay" mechanism no longer applies automatically. The payer must either withhold at the full domestic rate and later apply for a refund, or obtain a KAS opinion in advance. The opinion procedure takes up to six months. Planning payments across the calendar year to stay below the threshold is a legitimate but increasingly scrutinised approach.

For cross-border structures involving IP Box or transfer pricing arrangements, the interaction between treaty rates and Polish domestic rules adds another layer. A Ukrainian entity receiving royalties from a Polish IP Box company faces a 10% treaty cap – but the Polish payer must also demonstrate that the royalty is arm's length. Misalignment between the treaty claim and the transfer pricing documentation creates audit risk on two fronts simultaneously. For businesses navigating KSeF compliance alongside these obligations, see our guide on KSeF deadline timeline 2026–2027 for companies in the United States.

Three business scenarios where the treaty is most often invoked

Understanding the treaty in the abstract is less useful than seeing how it operates in three common fact patterns. Each scenario presents different risks and requires a different approach to treaty compliance.

Scenario 1 – Manufacturing investor. A Ukrainian manufacturing group establishes a Polish production subsidiary. Profits are repatriated as dividends. The group holds over 25% of the Polish company's share capital directly. The applicable treaty rate is 5%. The key risk is the beneficial ownership test: if the Ukrainian parent is thinly capitalised and passes dividends upward to a BVI entity within weeks, KAS will disallow the 5% rate. The group should document retained earnings at the Ukrainian level for at least one full financial year before repatriation.

Scenario 2 – IT services and royalties. A Warsaw-based software company licences technology from its Ukrainian sister entity. Royalty payments are subject to 10% withholding under the treaty. The Polish company must verify that the Ukrainian licensor owns the IP outright – not as a sub-licensor. If the Ukrainian entity itself licences the IP from a third party and merely passes it on, the beneficial ownership test fails. Transfer pricing documentation must align with the royalty rate claimed.

Scenario 3 – Ukrainian individual as Polish company shareholder. A Ukrainian individual (not a company) holds shares in a Polish spółka z ograniczoną odpowiedzialnością (private limited liability company, sp. z o.o.) directly. The 15% dividend rate applies. The individual must obtain a Ukrainian residency certificate. If the individual has also established tax residency in Poland – for example, by residing in Poland for more than 183 days per year – the treaty's tie-breaker rules apply. Polish tax residency would make the dividend fully taxable in Poland at 19%, with no treaty reduction available.

Our team obtained interim protection of treaty documentation for a Ukrainian investor's subsidiary in Lower Silesia (spring 2026), preventing KAS from treating the shareholder as a Polish tax resident on the basis of a disputed centre-of-vital-interests analysis. The matter was resolved within 90 days through a formal binding ruling from the Director of the National Tax Information Bureau (Dyrektor Krajowej Informacji Skarbowej, DKIS).

For Ukrainian businesses also managing Polish commercial premises, our article on office lease review: key points for Ukraine tenants addresses related compliance considerations.

What to prepare: a practical checklist

Treaty compliance is document-intensive. The following checklist applies to any Ukrainian entity or individual seeking to apply reduced Polish withholding rates. Missing any single item gives KAS grounds to disallow the claim and assess the full domestic rate.

Valid residency certificate from the Ukrainian State Tax Service, issued in the current or preceding tax year
Substance file for the Ukrainian recipient: lease, payroll, bank statements, board resolutions
Transfer pricing documentation if the payment is between related parties
Beneficial ownership declaration signed by the recipient's authorised representative
KAS opinion or withholding exemption ruling if annual payments to one recipient exceed PLN 2m

Preparing this file before the first payment – rather than scrambling after an audit notice arrives – reduces the risk of disallowance to near zero. A tax advisor Warsaw-based or Krakow-based with Ukrainian desk experience can assemble this documentation in two to four weeks, depending on the recipient's corporate structure. The cost of preparation is a fraction of the withholding tax saved on a PLN 1m+ payment.

The treaty also has a limitation-on-benefits clause in practice, even though the 1994 text predates the OECD's formal LOB provisions. GAAR applies to any arrangement whose principal purpose is obtaining a treaty benefit. Structures designed solely to route income through Ukraine to access the 5% dividend rate – without genuine Ukrainian business activity – are squarely within GAAR's scope. The consequences include reassessment at 19%, a 50% penalty surcharge, and potential referral for fiscal criminal proceedings. This outcome is irreversible once the limitation period for the original payment has passed.

For Swedish-market businesses with similar cross-border compliance questions, see our analysis of what KSeF means for your business in Sweden.

Specific situations require tailored analysis. The treaty's interaction with GAAR, beneficial ownership, and the PLN 2m threshold creates a compliance matrix that generic guidance cannot resolve. To receive an expert assessment of your cross-border structure, contact info@kordeckipartners.com.

Frequently asked questions

Q: How long is a Ukrainian residency certificate valid for Polish withholding tax purposes?

A: Under Polish tax law, a residency certificate is valid for 12 months from its date of issue. If the certificate does not state a validity period, it covers the calendar year in which it was issued. Payments made after the certificate expires are treated as if no certificate exists, meaning the full domestic withholding rate applies. Certificates should be renewed annually, ideally before the first payment of each calendar year.

Q: Does the treaty apply to Ukrainian individuals who have relocated to Poland?

A: This is one of the most common misconceptions. The treaty applies only to persons who are residents of one or both contracting states. A Ukrainian national who has established Polish tax residency – by spending more than 183 days per year in Poland or by having their centre of vital interests here – is treated as a Polish resident for treaty purposes. The treaty's tie-breaker rules then determine which state has primary taxing rights. In many cases, the individual becomes fully taxable in Poland, and no reduced treaty rate is available on Polish-source income.

Q: What does the PLN 2m threshold mean in practice, and how is it calculated?

A: The threshold applies per recipient, per payer, per calendar year. It covers all passive income payments – dividends, interest, and royalties – made by the Polish entity to a single foreign recipient. Once cumulative payments in a calendar year exceed PLN 2m, the simplified collection mechanism is suspended. The payer must either withhold at the full domestic rate and file for a refund on behalf of the recipient, or obtain a formal KAS opinion confirming the reduced treaty rate before continuing payments. The opinion procedure takes up to six months, so advance planning is essential for structures with regular cross-border payments.

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