KSeF Migration
National e-Invoice System
Prepare your systems for mandatory e-invoices from February 2026. Professional migration of ERP, CRM and custom systems to KSeF.
Key KSeF Deadlines
After postponement from 2024, new mandatory KSeF implementation deadlines are now set.
February 1, 2026
Large companies (>200,000,000 USD revenue)
April 1, 2026
All other companies
31 grudnia 2026
End of penalty mitigation period
January 2026
Nowy format FA(3) XML
Czym jest KSeF?
The National e-Invoice System is a central platform of the Ministry of Finance for handling structured electronic invoices in XML format.
Mandatory e-invoices
All B2B invoices must be issued through KSeF in XML format.
Replacing PDF and paper
KSeF replaces all current invoice formats - PDF, paper and custom electronic.
Szybsze zwroty VAT
VAT refund period shortened from 60 to 40 days for KSeF users.
Eliminacja JPK_FA
No need to submit separate JPK_FA report for KSeF invoices.
Kluczowe wymagania
Migration Services
Comprehensive support in preparing systems for KSeF - from analysis through integration to training.
Integracja ERP
We connect SAP, Microsoft Dynamics, Oracle systems with KSeF API.
- SAP ECC i S/4HANA
- Microsoft Dynamics 365
- Oracle NetSuite
- Inne systemy ERP
Systemy Niestandardowe
Modernization of older accounting and invoicing systems.
- Systemy AS/400, mainframe
- Custom accounting systems
- Stare systemy CRM
- Middleware integration
Integracja API
Direct integration with KSeF 2.0 API in OpenAPI standard.
- Custom API connectors
- XML FA(3) generation
- Error handling & validation
- Automated testing
Migracja Danych
Conversion of existing invoices to XML FA(3) format.
- Konwersja PDF do XML
- Accounting data mapping
- Walidacja struktury FA(3)
- Backup i archiwizacja
Testy i Walidacja
Kompleksowe testowanie przed uruchomieniem produkcyjnym.
- Środowisko testowe KSeF
- Testy integracyjne API
- XML format validation
- User Acceptance Testing
Szkolenia i Wsparcie
Team preparation and post-implementation support.
- User training
- Process documentation
- 24/7 technical support
- Updates and maintenance
Migration Strategies
We choose the optimal migration approach depending on company size and system complexity.
Small Companies
Ready SaaS solutions with full KSeF support.
Medium Companies
Middleware connecting existing systems with KSeF API.
Large Companies
Dedicated API integrations and ERP modernization.
Benefits of KSeF
KSeF implementation brings measurable business and operational benefits.
Faster VAT refunds
Shortening VAT refund period from 60 to 40 days for KSeF users.
Cost reduction
Elimination of printing, shipping and storage costs for paper invoices.
Process automation
Complete automation of invoice flow from issuance to booking.
Compliance
Automatic compliance with tax regulations.
JPK_FA elimination
No need to submit separate JPK_FA report.
Central archive
Secure storage of invoices in the government system.
Frequently Asked Questions
Answers to questions about KSeF migration
What is KSeF and when will it become mandatory?
KSeF (National e-Invoice System) is an electronic invoice issuing and transmission system that will become mandatory from July 1, 2026, for all entrepreneurs in Poland, replacing current paper and PDF invoices.
Which systems require KSeF updates?
All accounting systems, invoicing programs, ERP systems, online stores, and mobile applications issuing invoices must be adapted to KSeF API standards.
How long does KSeF migration take?
Migration time depends on system complexity: simple accounting programs - 2-4 weeks, ERP systems - 2-3 months, complex e-commerce platforms - 3-6 months. We recommend starting preparations now.
Will our invoices be compatible with client systems?
Yes, KSeF ensures full compatibility between different systems. Invoices issued in your system will be automatically available in your contractors' systems after KSeF integration.
What benefits does early KSeF implementation provide?
Early implementation eliminates time pressure, allows gradual testing, provides competitive advantage, enables process optimization, and ensures full team preparation before the mandatory deadline.
How much does system adaptation to KSeF cost?
Costs depend on system type: accounting program updates ~ 2000 USD, e-commerce platform integration ~ 5000 USD, ERP system adaptation from 8000 USD. We offer free quotes after audit.
Prepare for KSeF today
Time until mandatory KSeF implementation passes quickly. Start migration now to avoid stress in 2026 and take advantage of all system benefits.