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The Polish Ministry of Finance has confirmed that no further delays are planned for the introduction of mandatory e‑invoicing in Poland. This marks an important compliance milestone for businesses with Polish VAT obligations.
As a result, the National e‑Invoicing System (KSeF) will become mandatory in phases, depending on the size of the business.
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ToggleKey e‑Invoicing deadlines in Poland
Mandatory e‑invoicing will apply to Polish taxpayers and foreign businesses with a fixed establishment in Poland from the following dates:
- 1 February 2026 – Large Polish taxpayers (annual revenue above PLN 200 million)
- 1 April 2026 – All other Polish taxpayers
- 1 January 2027 – Micro‑enterprises and the smallest businesses (monthly sales below PLN 10,000)
Importantly, a grace period will remain in effect until 31 December 2026. During this time, no penalties will be imposed for non‑compliance with Polish e‑invoicing rules.
How the Polish e‑Invoicing system works
Poland will use a centralised e‑invoicing model. All e‑invoices must be issued and received in XML format, in real time, via the National e‑Invoicing System (KSeF).
The process will follow this structure:
This model enables Polish tax authorities to access invoice data instantly, thereby strengthening VAT compliance and reporting accuracy.
What does this mean for your business?
1. KSeF Use Is Optional for Most Non‑Polish E‑Commerce Businesses
If you are a foreign (non‑Polish) e‑commerce business and do not operate through a fixed establishment in Poland, the use of KSeF is not mandatory.
For VAT purposes, a fixed establishment generally means having, or controlling, human and technical resources located in Poland. Without this presence, Polish e‑invoicing obligations do not apply to you directly.
2. Impact on Purchases from Polish Suppliers
For most non‑Polish businesses, the impact of Polish e‑invoicing will be minimal.
While Polish suppliers must issue e‑invoices via KSeF, foreign purchasers who are not registered in KSeF cannot receive invoices in XML format. Therefore, Polish suppliers will still need to provide invoices outside the KSeF system, for example:
- By email
- In a mutually agreed format, such as PDF
As a result, your day‑to‑day purchasing processes should remain largely unchanged.
3. Impact on Your Polish VAT Returns
Each e‑invoice issued through KSeF will receive a unique KSeF number. This number must be reported in the Polish VAT return.
Therefore, if you claim input VAT on future purchases from Polish suppliers, you may need to obtain the KSeF reference numbers for those invoices. This will allow us to complete your Polish VAT filings correctly.
If this requirement becomes relevant to your business, AVASK will guide you through the process and let you know exactly what action is needed.
Explore our Global VAT Guides to learn more about Polish VAT regulations and compliance requirements.
What‘s next?
E‑invoicing is becoming a global VAT compliance standard, with more countries introducing real‑time reporting and digital invoice systems.
AVASK is closely monitoring these developments across Europe and beyond. We will continue to keep you informed about new e‑invoicing requirements, compliance risks, and opportunities to streamline your VAT processes.
If you have questions about Polish VAT, KSeF, or how e‑invoicing may affect your business, our compliance experts are here to help.
