A Warsaw-based software company signs a contract with a Dutch logistics platform. Within days, employee records, client data, and proprietary algorithms begin flowing across the border. The legal team assumes GDPR covers everything. That assumption, left unexamined, creates real exposure.

Transferring personal data from Poland to the Netherlands is lawful under the General Data Protection Regulation (GDPR) because both countries are EU member states. No separate adequacy decision or standard contractual clauses are required for intra-EU transfers. However, the transfer must still rest on a valid legal basis, comply with data minimisation rules, and be documented in records of processing activities maintained by the Polish controller or processor.

This alert covers the three legal mechanisms that govern Poland-to-Netherlands data flows, the compliance steps that Polish companies must complete before transfer, and the immediate action items triggered by recent enforcement trends across both jurisdictions.

Why intra-EU transfers still carry compliance risk

The free movement of personal data within the EU is one of GDPR's foundational principles. Poland and the Netherlands both fall within the European Economic Area (EEA), so no adequacy decision – the formal instrument required for transfers to third countries – is needed. That much is clear. What companies routinely underestimate is the layer of obligations that remain fully operative even for intra-EU flows.

The Polish controller must identify a lawful basis under GDPR before any transfer begins. For employment data, that basis is typically a legal obligation or legitimate interest. For client data, it is usually contract performance or consent. The Urząd Ochrony Danych Osobowych (Personal Data Protection Office, UODO) – Poland's supervisory authority – has issued enforcement decisions against companies that transferred data to EU partners without documenting the legal basis at all. Fines in those cases reached PLN 1m or more.

The Dutch counterpart, the Autoriteit Persoonsgegevens (Dutch Data Protection Authority, AP), applies equally strict standards. Where a Polish company acts as a data processor for a Dutch controller, a data processing agreement compliant with GDPR must be in place before the first byte moves. Missing that agreement – even between two EU entities – precludes a defence in enforcement proceedings on either side.

  • Identify the lawful basis for each data category transferred
  • Execute a data processing agreement if acting as processor
  • Update records of processing activities to reflect the Dutch recipient
  • Conduct a data protection impact assessment for high-risk transfers
  • Appoint a Data Protection Officer if processing meets the statutory threshold

We secured a favourable UODO outcome for a fintech client in the Mazowieckie region (spring 2025), reversing a preliminary finding of unlawful transfer after we demonstrated that a valid processing agreement and updated records had been in place from the outset.

What legal mechanisms apply – and which fits your situation?

Three mechanisms govern intra-EU data transfers from Poland to the Netherlands. Each has a different scope, documentation burden, and risk profile. Choosing the wrong one – or conflating them – is the most common error Polish legal teams make when structuring cross-border data flows.

First: direct controller-to-controller transfer. Where both the Polish and Dutch entities independently determine the purposes and means of processing, each is a separate controller. GDPR allows the transfer without any inter-party agreement, provided each controller has its own lawful basis. This structure suits group companies sharing HR data or joint marketing campaigns. The risk is that UODO may challenge the independence of purpose determination and reclassify the relationship as joint controllership – triggering a 72-hour breach notification window if the arrangement later fails.

Second: controller-to-processor transfer. Where the Dutch entity processes data solely on the Polish company's instructions, a data processing agreement is mandatory. That agreement must specify the subject matter, duration, nature, and purpose of processing, along with the categories of data and data subjects. Failure to include all mandatory elements renders the agreement void under Polish contract law and unenforceable under GDPR. Processors handling data for financial institutions must also consider the structural implications of operating in the Netherlands, particularly under DORA compliance frameworks applicable from January 2025.

Third: joint controllership. Where both parties jointly determine purposes and means, a joint controllership arrangement must be documented. The arrangement must allocate GDPR obligations between the parties and be made available to data subjects on request. This mechanism is underused in practice – and its absence, where the facts require it, is a recurring finding in UODO inspections.

For companies managing IP-intensive data flows – source code repositories, patent databases, or trade-secret documentation – the choice of mechanism also intersects with IP protection strategy considerations that an IP lawyer in Warsaw should review alongside the data transfer structure.

What to do now – immediate action items

Enforcement timelines are short. UODO can open an investigation within 30 days of receiving a complaint. The AP has demonstrated willingness to coordinate with UODO under the GDPR one-stop-shop mechanism, meaning a Dutch data subject complaint can trigger Polish enforcement proceedings. Companies with ongoing Poland-to-Netherlands data flows should treat the following as a 30-day compliance sprint.

Start with a data mapping exercise. Identify every category of personal data flowing to Dutch recipients, the volume, frequency, and the legal basis claimed for each flow. This exercise typically takes five to ten business days for a mid-sized company. Without it, no other compliance step is reliable.

Next, audit existing agreements. Data processing agreements signed before 2021 may predate the current GDPR standard clauses and lack mandatory elements. Replace or amend them within 60 days. For joint controllership arrangements, document the allocation of obligations now – do not wait for an inspection. Similar compliance timelines apply to data transfer structures involving France, where enforcement patterns closely mirror the Dutch approach.

Finally, review your AI Act Poland obligations if automated decision-making is involved in the transferred data flows. The AI Act introduces risk classification requirements that interact directly with GDPR's rules on automated processing. DORA compliance is separately relevant for any financial-sector data transferred to Dutch processors acting as ICT third-party service providers – the threshold for mandatory contractual provisions under DORA is any ICT service supporting a critical or important function.

Our team assisted a Silesian manufacturing group in restructuring its data transfer arrangements with a Dutch parent (winter 2025), reducing the compliance gap from eleven open findings to zero within eight weeks.

Specific situations – particularly those involving trademark data, trade secrets, or regulated financial data – require tailored analysis. A generic GDPR checklist will not surface the interaction between GDPR Poland requirements, AI Act obligations, and DORA compliance that applies to technology-intensive transfers.

To receive an expert assessment of your Poland-to-Netherlands data transfer structure, 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 data protection, IP, and technology regulation. 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.