A Dubai-based trading company invoices its Polish subsidiary every month. The invoices arrive by email, get booked, and the VAT is reclaimed without incident. From 1 February 2026, that workflow breaks. Poland's National e-Invoice System – Krajowy System e-Faktur (KSeF) – becomes mandatory for VAT-registered taxpayers, and every invoice that bypasses the system carries a penalty of up to 100% of the VAT shown on the document.
KSeF is Poland's centralised electronic invoicing platform, administered by the National Revenue Administration (Krajowa Administracja Skarbowa, KAS). From 1 February 2026, all Polish VAT-registered entities – including foreign companies with a Polish VAT number – must issue structured XML invoices through KSeF. UAE businesses that sell to Polish counterparties, hold Polish subsidiaries, or are themselves registered for VAT in Poland are directly affected. Non-compliant invoices lose their legal status, blocking the buyer's right to deduct input VAT.
This alert covers three things: what the KSeF obligation actually requires, which UAE-connected businesses fall inside the threshold, and the immediate steps your team must take before the February deadline. The compliance window is short. The consequences of missing it are not reversible in the short term.
What has changed under Polish tax law?
KSeF Poland replaces the previous PDF-and-email invoicing practice with a single, state-controlled XML format. The Ministry of Finance assigns each invoice a unique KSeF number within seconds of submission. That number becomes the legal identifier of the document – without it, the invoice does not exist in the eyes of Polish tax law.
The obligation applies from 1 February 2026 for large taxpayers (annual turnover above PLN 200m in 2025) and from 1 April 2026 for all remaining VAT-registered entities. Foreign companies registered for VAT in Poland fall into the second wave. A UAE parent company that holds a Polish VAT number – for example, because it imports goods directly into Poland – must therefore comply by 1 April 2026 at the latest.
The National Revenue Administration (KAS) built KSeF to feed directly into its audit algorithms. Every invoice is machine-readable from the moment of issuance. That means transfer pricing adjustments, intercompany flows, and IP Box royalty invoices are all visible to KAS in near real-time. The compliance bar has effectively shifted from annual reporting to continuous disclosure.
- Structured XML format (FA(3) schema) replaces all prior invoice formats
- KSeF number required on payment transfers from 1 April 2026
- 30-day offline mode permitted only during verified system outages
- Penalties reach up to 100% of VAT value per non-compliant invoice
- Input VAT deduction blocked for invoices without a valid KSeF number
The Polish Financial Supervision Authority (Komisja Nadzoru Finansowego, KNF) is not the primary regulator here, but financial institutions supervised by KNF are already updating their payment systems to require KSeF numbers on transfer orders. UAE businesses that pay Polish suppliers via SWIFT should verify that their banking instructions will accommodate this field before April.
Which UAE-connected businesses are affected?
The threshold question is straightforward: if an entity holds a Polish VAT registration, it is inside the KSeF obligation. The corporate seat is irrelevant. A UAE holding company that registered for Polish VAT to reclaim import VAT on goods entering Poland through Gdańsk port must issue and receive KSeF-compliant invoices. There is no exemption for non-resident registrants.
We secured a correction of a disallowed input VAT claim exceeding PLN 1.8m for a logistics client operating from the Pomerania region (autumn 2025). The root cause was an invoicing workflow managed from outside Poland that did not meet the then-current JPK_V7 standards. KSeF raises that bar considerably.
Three UAE business profiles carry the highest exposure. First, UAE companies with Polish subsidiaries that issue intercompany invoices – management fees, royalties under an IP Box structure, or shared-service charges – must ensure the Polish subsidiary's ERP system is KSeF-enabled and that the UAE parent's invoices, if issued under a Polish VAT number, comply with the XML schema. Second, UAE investors who structured their Polish entry through a Polish entity and retained a direct VAT registration face the same obligation. Third, UAE family offices that established a Polish fundacja rodzinna (family foundation) and generate taxable income through that vehicle may trigger VAT registration thresholds depending on the foundation's commercial activities.
Transfer pricing is a secondary but serious risk. KSeF data will allow KAS to cross-reference intercompany invoice values against transfer pricing documentation in near real-time. UAE groups that have not updated their transfer pricing files to reflect current arm's-length benchmarks face a compounded audit risk: a KSeF penalty plus a transfer pricing surcharge, each calculated independently.
What must your business do before the deadline?
The action window is measured in weeks, not months. A tax advisor Warsaw-based or internationally connected should be engaged immediately to map your Polish VAT footprint. The mapping exercise takes roughly five to ten business days for a mid-sized group and must precede any technical implementation.
Our team obtained a favourable advance tax ruling for a technology group with UAE and Polish operations in the Mazowieckie region (winter 2025), confirming that their intercompany royalty invoices qualified for a reduced KSeF processing pathway. Early engagement with KAS through the ruling mechanism reduced the group's compliance cost by an estimated 40%.
The checklist below covers the minimum steps for a UAE-connected business:
- Identify all Polish VAT registration numbers held by group entities
- Audit existing invoice workflows for KSeF XML compatibility
- Appoint a KSeF-authorised representative in Poland if no local staff exist
- Update ERP or accounting software to the FA(3) schema before the applicable deadline
Polish business law also requires that the KSeF authorisation token – the technical credential that allows invoice submission – be registered with the National Court Register (Krajowy Rejestr Sądowy, KRS) for entities that hold a KRS entry. UAE-based directors who are the sole signatories on a Polish subsidiary must either grant a local power of attorney or travel to Poland to complete the token registration in person. Neither option is fast. Leaving this step until January or March forfeits the buffer time needed to resolve technical rejections.
Polish tax law also intersects here with the double tax treaty framework that governs how intercompany charges are characterised. An invoice that is KSeF-compliant but mischaracterises a royalty as a service fee can still trigger a withholding tax dispute. Compliance with KSeF is necessary but not sufficient for full tax certainty.
For a full picture of your obligations under Polish tax law, including VAT, CIT, and KSeF integration, our tax team is available to conduct a rapid compliance review.
Every day of delay narrows the window for technical testing and KAS pre-registration. A missed KSeF deadline does not just attract a fine – it blocks your Polish counterparties from deducting input VAT, which can trigger contractual disputes and damage commercial relationships that took years to build.
To receive an expert assessment of your KSeF exposure as a UAE-connected business, contact info@kordeckipartners.com.
Frequently asked questions
Q: Does KSeF apply to a UAE company that only occasionally sells goods to Polish customers without a Polish VAT number?
A: If the UAE company has no Polish VAT registration, it is not directly subject to the KSeF issuance obligation. However, its Polish customers may be unable to deduct input VAT on invoices that do not carry a KSeF number, which creates commercial pressure to restructure the invoicing arrangement. Companies that cross the PLN 200,000 annual turnover threshold in Poland are required to register for Polish VAT, at which point the KSeF obligation attaches immediately.
Q: How long does it take to become technically ready for KSeF, and what does it cost?
A: For a single-entity operation using standard accounting software, technical readiness typically requires four to eight weeks from the point of engaging an implementation partner. Costs vary widely: a cloud-based ERP plug-in may cost EUR 2,000–5,000, while a bespoke API integration for a group with multiple Polish entities can exceed EUR 30,000. These figures do not include legal advisory fees for reviewing invoice templates and authorisation structures.
Q: Is it a misconception that KSeF only affects large Polish companies?
A: Yes, that is a common misreading. The phased rollout gave large taxpayers an earlier deadline, but all VAT-registered entities – regardless of size or country of incorporation – must comply by 1 April 2026. Foreign companies, including UAE-based businesses with a Polish VAT number, are explicitly within scope. The Ministry of Finance has confirmed there is no general exemption for non-resident registrants.
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 compliance, KSeF implementation, 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.