Poland launched the first phase of mandatory B2B e-invoicing under the Krajowy System e-Faktur (KSeF) on 1 February 2026, requiring businesses with 2024 annual turnover exceeding PLN 200 million to issue invoices exclusively through the national clearance platform.
Scope and requirements
The obligation applies to large taxpayers who must now issue structured e-invoices via KSeF, with paper and PDF invoices no longer sufficient for domestic B2B transactions. Buyers must be technically capable of receiving invoices through the platform, while other taxpayers not yet required to issue invoices through KSeF must already be able to receive them.
System performance and penalties
The Ministry of Finance reported that KSeF processed over 50,000 invoices shortly after launch, with approximately 320,000 users logging into the system without material outages. Poland confirmed a penalty-free period throughout 2026, though legal obligations remain in force with rejected invoices treated as not issued and VAT deduction risks continuing. Administrative penalties will apply from 1 January 2027.
Implementation timeline
The phased rollout continues with mandatory issuance extending to most other VAT-registered businesses from 1 April 2026, followed by micro-entrepreneurs with low monthly turnover from 1 January 2027. Additional obligations including KSeF references in payment titles and expanded cash register reporting will follow under the confirmed roadmap.
Context
The successful KSeF launch represents a significant milestone in Poland's transition to real-time VAT controls, joining other European jurisdictions implementing mandatory e-invoicing systems. The stable system performance and structured rollout approach provide a model for other countries developing similar clearance-based e-invoicing mandates.
