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Last update: 2024, July 1
E-Invoicing is currently accepted, as well as paper or PDF invoices.
E-Invoicing should become mandatory both for B2G & B2B transactions in 2026 through the “KSeF” central platform using the “FA(2)” (XML) format, although the project has been postponed and currently sits at a standstill.
The existing “PEF” platform, connected to Peppol, will also remain available for B2G transactions using the Peppol BIS 3.0 format.
What the Law Says
B2G E-Invoicing
It is mandatory for all Polish public administrations to accept electronic invoices through the “PEF” central platform in plain PEPPOL BIS 3.0 UBL format or a Polish extended “Faktura specjalizowana” variant. The PEF platform is also connected directly to the Peppol network.
However, invoices can currently also be sent in paper or PDF format, as long as a complete audit trail is ensured.
Additionally, e-invoicing will become mandatory for all B2G transactions in Poland in 2026, following several delays. The roll-out will consist of 2 phases, depending on company annual turnover:
- February 1, 2026: mandatory for companies with +200 PLN annual turnover
- April 1, 2026: mandatory for all companies
Incidentally, a new central platform called “KSeF” (also directly connected to the Peppol network) is also available in addition to the PEF platform. All invoices going through the KSeF platform have to be issued in a new XML format called “FA(2)“.
It means that suppliers of the public administrations have the choice between the PEF platform in Peppol BIS 3.0 format or the KSeF platform in FA(2) format.
Invoices must be archived for 5 years in most cases.
B2B E-Invoicing
There is currently no B2B e-invoicing mandate in Poland, and as long as businesses ensure a complete invoice audit trail, they can exchange invoices in multiple ways
- Paper
- EDI
Everything will change in 2026, as electronic invoicing will then become mandatory for all B2B domestic transactions:
- Companies with an annual turnover above 200M PNL will have to comply from February 1, 2026
- All other companies will follow starting from April 1, 2026
E-Invoices will have to be sent in the XML “FA(2)” format through the new “KSeF” central platform and all other formats & transmission methods will not be accepted anymore. It is also not possible to use the PEF platform for B2B transactions.
Finally, after some back & forth from the tax authority, B2C transactions will be possible via the KSeF platform, but not mandatory: paper or PDF will remain allowed for those.
Invoices must be archived for 5 years in most cases.
Timeline
B2G E-Invoicing - Mandatory Acceptance
All Polish public administrations must accept e-invoices through the "PEF" platform in PEPPOL BIS 3.0 and the extended "Faktura specjalizowana" format.
KSeF Platform Becomes Available
B2G & B2B invoices can now be sent through the KSeF platform on a voluntary basis
B2G & B2B E-Invoicing Mandate - Large companies
All B2G & B2B transactions must be issued in electronic format for companies with an annual turnover above 200M PLN.
B2G & B2B E-Invoicing Mandate - All companies
All B2G & B2B transactions must be issued in electronic format countrywide, either through the KSEF platform (B2G or B2B) or the PEF platform (B2G only).
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Resources
Public entity supervising the e-invoicing mandate in Poland
Official guidelines & resources on the use of the KSeF central platform
Technical specifications for the KSeF central platform
Homepage of the PEF platform used for B2G transactions in Poland
Technical specifications of the Polish FA(2) format to be used on the KSeF central platform
Technical Details
As of today, there is no requirement regarding the way to transmit invoices in Poland, which means they can be issued at will as:
- Paper-based invoices
- PDF invoices with e-signature or complete audit trail
- EDI invoices
Additionally, the tax authority is implementing a new platform called “KSeF” (Krajowy System e-Faktur), using a dedicated, Poland-specific “FA(2)” format (based on XML but not compliant with the EN 16931). All voluntary businesses can already use it to exchange their B2G or B2B invoices, and upon successful submission of an e-invoice to the KSeF platform, the invoice issuer receives an official receipt called “UPO” from the platform.
Regarding B2G transactions specifically, businesses can use either the KSeF platform or the “PEF” (Platformy Elektronicznego Fakturowania) central platform. When opting for the PEF platform, supppliers have to send invoices in PEPPOL BIS 3.0 format (based on UBL XML) or using a BIS 3.0-UBL extension called “Faktura specjalizowana“, which adds specific fields for domestic Polish invoicing e.g. for Utility statements, addition gross data or supporting invoice factoring. All public administrations are required to accept e-invoices these ways. The “PEF” platform is connected to the Peppol network, facilitating adoption and increasing interoperability particularly for cross-border invoices.
Then, in 2026, a country-wide e-invoicing mandate will become effective, both for B2G & B2B transactions. All B2B transactions will have to go through the KSeF platform, while B2G transactions will have to go through either the KSeF or the PEF platforms.
Outside the usual benefits of electronic invoicing (automation, efficiency, compliance, …), the Polish finance authorities offer specific incentives to increase usage of the KSeF platform specifically, such as:
- 10-years invoice archiving by the KSeF platform (businesses don’t need to archive the invoices themselves anymore)
- Automated invoice e-reporting to the tax authority (SAF-T process not necessary anymore)
- Tax incentives in some cases (for example quicker VAT refunds) until the e-invoicing mandate officially enters into force
Resources
Public entity supervising the e-invoicing mandate in Poland
Official guidelines & resources on the use of the KSeF central platform
Technical specifications for the KSeF central platform
Homepage of the PEF platform used for B2G transactions in Poland
Technical specifications of the Polish FA(2) format to be used on the KSeF central platform
The Invoicing Hub Word
Poland is currently facing significant VAT gaps, and mandatory e-invoicing will serve as a crucial tool in fighting this issue
Although the chosen model of one central platform “KSeF” (two if you count the legacy “PEF” B2G platform) and one standard format “FA(2)” makes the implementation of e-invoicing relatively straightforward for Polish companies, the language barrier can prove a challenge for multinational companies and for service providers wishing to offer e-invoicing services in Poland.
Fortunately, the interoperability between PEF platform and the Peppol network was definitely a key driver towards e-invoicing adoption and greatly facilitated the B2G mandate implementation. The KSeF platform may follow the same path of interoperability with the Peppol network – but this is not decided yet. In any case, this would greatly help to make sure the new country-wide mandate implementation is a success, particularly with cross-border invoices.
However, the fact that the FA(2) format does not comply with the European Norm 16931 raises questions, and may lead to future work in order to remain compliant with the European Directives on e-invoicing.
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