April 1, 2026: KSeF readiness checklist for companies
A complete checklist to help you get through your KSeF implementation without downtime or firefighting.
Business area
At the business level, clear roles need to be established: who issues documents, who handles corrections and who is responsible for contact with the accounting office.
Without this, even the best technical integration will not solve the problem, because operational decisions will be made ad hoc.
- •Owner of the invoicing process.
- •SLA for corrections and exceptions.
- •Error escalation process.
Technical area
It is critical to check integration with source systems, especially ERP and sales modules. Many errors come from inconsistent data formats.
It is worth running automatic validations before sending them to KSeF. The earlier you detect a non-compliance, the lower the cost of correction.
- •Mapping the data required by the invoice schema.
- •Document validation before shipment.
- •Status and queue monitoring.
The area of people and change
The implementation of KSeF means a change in the way of working. Therefore, short, practical instructions for users are needed, not just technical documentation.
The most effective model is scenario training: sales, correction, validation error, failure, re-shipment.
- •One-page instructions for roles.
- •Training on real cases.
- •One week of hypercare after launch.