ELECTRONIC INVOICING
E-Invoicing
in Poland
Format: KSeF
Where are we now?
In Poland, e-invoicing is undergoing a radical transformation with the introduction of the national KSeF system (Krajowy System e-Faktur), a centralised platform managed by the tax administration. From 2026, electronic invoicing will become progressively mandatory for all domestic B2B transactions, marking the shift to a “clearance” model, in which every invoice must be validated by the system before acquiring legal value.
Adoption is structured in several phases: from 1 February 2026 for large businesses, from 1 April 2026 for all other companies, and from January 2027 for micro-enterprises. All invoices must be issued in structured XML format (FA(3)) and transmitted via KSeF, which becomes the only valid channel for B2B operations.
Even in the public sector (B2G), e-invoicing is now fully mandatory, while in B2C it remains optional. The system introduces significant benefits, such as automated tax checks, centralised archiving and greater transparency in transactions. However, it requires companies to make important technological adjustments, especially in terms of API integration and handling the new formats.
For businesses operating in Poland, adapting to the KSeF model is not just a matter of compliance, but a strategic step towards more digital, efficient and integrated financial processes.
A-Cube APIs for e-invoicing in Poland
Where are we now?
In Poland, e-invoicing is undergoing a radical transformation with the introduction of the national KSeF system (Krajowy System e-Faktur), a centralised platform managed by the tax administration. From 2026, electronic invoicing will become progressively mandatory for all domestic B2B transactions, marking the shift to a “clearance” model, in which every invoice must be validated by the system before acquiring legal value.
Adoption is structured in several phases: from 1 February 2026 for large businesses, from 1 April 2026 for all other companies, and from January 2027 for micro-enterprises. All invoices must be issued in structured XML format (FA(3)) and transmitted via KSeF, which becomes the only valid channel for B2B operations.
Even in the public sector (B2G), e-invoicing is now fully mandatory, while in B2C it remains optional. The system introduces significant benefits, such as automated tax checks, centralised archiving and greater transparency in transactions. However, it requires companies to make important technological adjustments, especially in terms of API integration and handling the new formats.
For businesses operating in Poland, adapting to the KSeF model is not just a matter of compliance, but a strategic step towards more digital, efficient and integrated financial processes.
A-Cube APIs for e-invoicing in Poland
Local regulations, global API.
Every country has its own tax rules — we always have the right API. Our composable technology allows the platform to adapt to local needs, offering individual components or a fully integrated all-in-one solution.
European Union
Mandatory: VIDA from 2028
Local regulations, global API.
Every country has its own tax rules — we always have the right API. Our composable technology allows the platform to adapt to local needs, offering individual components or a fully integrated all-in-one solution.
European Union
Mandatory: VIDA from 2028
Local regulations, global API.
Every country has its own tax rules — we always have the right API. Our composable technology allows the platform to adapt to local needs, offering individual components or a fully integrated all-in-one solution.
European Union
Mandatory: VIDA from 2028