KSeF mandatory from April 1, 2026 — get prepared before it's too late

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Module 1: KSeF Fundamentals

1. What is KSeF?
2. Why does KSeF exist?
3. Implementation deadlines
4. Penalties from 2027

Module 2: Setting Up Access

1. Registering in KSeF
2. Managing permissions
3. Authorization tokens
4. Trusted profile & e-ID
5. Access for accounting firms

Module 3: FA(3) Schema

1. Invoice XML structure
2. Required fields
3. Optional fields
4. Validation & common errors
5. Invoice attachments

Module 4: Issuing & Receiving Invoices

1. Taxpayer Application
2. KSeF in Comarch Optima
3. KSeF in Symfonia
4. KSeF in wFirma & Fakturownia
5. KSeF number in bank transfers

Module 5: Emergency Mode & Edge Cases

1. Offline & offline24 mode
2. Invoice corrections in KSeF
3. Self-billing
4. Foreign invoices & B2C

Module 6: Organizing Your KSeF Workflow

1. Invoice archiving
2. Reconciliation with accounting
3. VAT reporting with KSeF
4. Internal company processes

Module 7: Industry-Specific Guidance

1. KSeF in construction
2. KSeF in e-commerce
3. KSeF in public sector
4. KSeF in transport & logistics

Module 1: KSeF Fundamentals

What is KSeF?

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