On paper, a double tax treaty eliminates the risk of the same income being taxed twice. In practice, many Polish-resident companies and foreign investors operating in Poland miss the treaty benefits they are legally entitled to – simply because they do not know which provisions apply, or when to invoke them.
Poland has concluded double tax treaties with over 80 countries, each built on the OECD Model Convention framework. The treaties allocate taxing rights between Poland and the treaty partner, covering dividends, interest, royalties, capital gains, and employment income. Withholding tax rates under treaties are typically reduced to 5–15%, compared with the standard Polish domestic rate of 19–20%.
This alert covers the key provisions that matter most for businesses, the thresholds that trigger treaty protection, and the immediate steps you should take to preserve your entitlement before the next payment cycle.
What are the core provisions of Poland's double tax treaties?
Polish double tax treaties follow the OECD Model Convention structure. Each treaty defines residency, allocates taxing rights, and sets reduced withholding rates. The National Tax Administration (Krajowa Administracja Skarbowa, KAS) enforces compliance, and the Head of the National Revenue Information Service (Dyrektor Krajowej Informacji Skarbowej, DKIS) issues binding rulings on treaty interpretation. The National Court Register (Krajowy Rejestr Sądowy, KRS) records are often required to confirm corporate residency for treaty purposes.
The most commercially significant provisions are these:
- Dividends – reduced withholding tax, commonly 5% for corporate shareholders holding at least 10–25% of share capital for 24 months
- Interest – reduced rate of 0–10%, depending on the treaty partner
- Royalties – reduced rate of 5–10%, relevant to IP Box and transfer pricing arrangements
- Permanent establishment – defines when a foreign entity becomes taxable in Poland
- Capital gains – most treaties exempt gains on shares from Polish tax if the seller is a non-resident
The beneficial rate applies only when the recipient provides a valid certificate of tax residency. Without it, the Polish payer must apply the full domestic withholding rate. That is the single most common compliance failure we see – and it is entirely avoidable.
For companies using Pillar Two practical steps for Polish subsidiaries, treaty positions interact directly with the global minimum tax calculation. Treaty-reduced withholding taxes affect the effective tax rate computation under the income inclusion rule.
Who is affected and what thresholds apply?
Treaty benefits are not automatic. Polish tax law imposes a "pay and refund" mechanism for withholding tax payments exceeding PLN 2 million per year to a single foreign recipient. Above that threshold, the payer must withhold at the full domestic rate and the recipient claims a refund – unless the payer obtains a special opinion on the application of the reduced rate (valid for 36 months) or the recipient holds a valid residency certificate and the payer files a statement of due diligence. Missing the PLN 2 million threshold triggers a cash-flow cost that can take months to recover.
We secured a refund of excess withholding tax exceeding PLN 800,000 for a technology client in the Mazowieckie region (autumn 2025). The payer had applied the full 20% rate on royalty payments without verifying the applicable treaty rate. Correcting the position required a formal refund application and a transfer pricing review of the royalty arrangement.
Three categories of taxpayer face the highest exposure:
- Foreign investors receiving dividends from Polish subsidiaries above PLN 2 million annually
- Polish companies paying royalties to foreign IP holders – directly relevant to IP Box structures
- Family foundation beneficiaries receiving distributions from Polish entities with cross-border elements
A KSeF deadline timeline for companies in Spain illustrates how Polish compliance obligations can affect foreign-registered entities. The same principle applies to treaty documentation: obligations arise in Poland regardless of where the recipient is incorporated.
What immediate steps should you take?
Treaty protection forfeits automatically when documentation lapses. A residency certificate older than the current or immediately preceding tax year is no longer valid for KAS purposes. The consequence is irreversible for payments already made: the payer bears the withholding tax liability, plus interest at 8% per annum, if the reduced rate was applied without a current certificate. Acting before the next payment cycle costs nothing. Acting after an audit costs considerably more.
We obtained a favourable binding ruling from DKIS for a manufacturing client in Lower Silesia (spring 2026), confirming that interest payments to a German parent qualified for the 0% treaty rate. The ruling took 3 months to obtain and protected payments totalling EUR 1.2 million annually.
Your immediate action checklist:
- Collect updated tax residency certificates from all foreign recipients before the next payment date
- Identify all cross-border payments exceeding PLN 2 million annually and assess the "pay and refund" exposure
- Review transfer pricing documentation for royalty and interest flows that rely on treaty rates
- Confirm that any Polish tax law double tax treaty position is supported by a DKIS binding ruling or a due diligence statement
Board liability under Polish corporate law extends to tax compliance failures. Directors who approve payments without adequate treaty documentation can face personal exposure. For the full analysis, see board liability under KSH – personal exposure.
Your company's specific treaty position determines whether the reduced rate is available at all. Applying the wrong rate – or missing the documentation deadline – precludes recovery for payments already processed and triggers KAS audit risk for the entire payment history.
If your company makes cross-border payments above PLN 2 million annually and has not reviewed its treaty documentation this year, we will audit your withholding tax position, identify refund opportunities, and prepare the required documentation: info@kordeckipartners.com.
Frequently asked questions
Q: How long does it take to obtain a refund of excess withholding tax under the "pay and refund" mechanism?
A: The standard refund period is 6 months from the date of application. KAS may extend this to 12 months in complex cases. Preparing complete documentation – including the residency certificate, contract, and proof of payment – before filing significantly reduces the risk of delays. A tax advisor Warsaw-based or otherwise can prepare the application within 2–4 weeks.
Q: Does a family foundation in Poland benefit from double tax treaty protection?
A: This is a common misconception. A Polish family foundation is a separate legal entity and may be a treaty resident in its own right. However, distributions to beneficiaries are subject to Polish tax law rules that operate independently of treaty provisions. The treaty position of the foundation and the beneficiary must be analysed separately, particularly where the beneficiary is a non-resident.
Q: Can KSeF Poland obligations affect treaty documentation requirements?
A: KSeF Poland governs structured invoicing for domestic VAT purposes and does not directly alter treaty documentation rules. However, KSeF invoice data is increasingly used by KAS in cross-referencing withholding tax filings. Inconsistencies between KSeF records and withholding tax returns can trigger audit inquiries, making accurate documentation across both systems important.
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, and cross-border structuring. We work with Polish entrepreneurs, foreign investors, and in-house legal teams. To discuss your situation, contact info@kordeckipartners.com.
Disclaimer: This publication is provided for informational purposes only and does not constitute legal advice. The information herein should not be relied upon as a substitute for professional legal counsel tailored to your specific circumstances. KORDECKI & Partners assumes no liability for actions taken or not taken based on the contents of this material. For advice regarding your particular situation, please contact info@kordeckipartners.com.