KSEF-010
Error Guide
🇵🇱 KSEF-010: KSeF XML schema validation failed in Poland
ErrorMandatoryManual Fix
Invoice XML must conform exactly to the FA schema version (FA/1 or FA/2). Even minor deviations cause rejection.
Quick Facts
Severity
Error (rejection)
Ruleset
KSeF
Mandate
B2B Mandatory
Fix Type
Manual
Why This Matters in Poland
Poland requires e-invoicing using KSeF XML format. Invoices with this error will be rejected. They cannot be processed for Poland compliance.
Invoice Navigator covers 134 KSeF FA(3) rules for Poland.
How to Fix KSEF-010
Poland E-Invoicing Requirements
Phase
Status
Scope
KSeF voluntary
Live (Jan 2022)
All VAT payers (opt-in)
B2B mandatory — Phase 1
Live (Feb 1, 2026)
Large taxpayers (>200M PLN turnover)
B2B mandatory — Phase 2
Live (Apr 1, 2026)
All remaining VAT-registered entities (SMEs, sole proprietors, VAT-exempt businesses)
B2G
Live (Feb 1, 2026)
Included in general KSeF mandate
Financial penalties
Jan 1, 2027
Up to 100% of VAT amount on non-compliant invoices
Common Causes
- •Missing required elements
- •Invalid element order
- •Software not updated to latest schema
Fix KSEF-010 automatically
Upload your invoice and let Invoice Navigator auto-remediate this error.