# Poland KSeF E-Invoicing Mandate: Rollout Timeline, FA(3) Schema & Integration

- Date: 2026-07-03
- Reading time: 7 min read

Guide to Poland’s Krajowy System e-Faktur (KSeF): 2026 rollout dates for large and SME taxpayers, FA(3) XML schema, QR codes, and offline mode.

## Article overview

        This article explains Poland KSeF E-Invoicing Mandate: Rollout Timeline, FA(3) Schema & Integration as a practical reference for European e-invoicing. It defines the topic in plain language, places it in the compliance context, and connects the explanation to invoice formats such as XRechnung, ZUGFeRD/Factur-X, UBL, and CII.

Poland is introducing mandatory B2B electronic invoicing via the Krajowy System e-Faktur (KSeF).

For businesses operating in Poland or billing Polish corporate clients, compliance requires issuing structured XML invoices in the official FA(3) format, acquiring a KSeF session token, and retrieving a unique KSeF identification number for each valid invoice.

        ## How to use this guide

        Use the article as a starting point before changing a finance or ERP workflow: identify the applicable country rule or standard, decide which structured format is expected, validate the generated XML, and keep a documented exception process for invoices that require manual review.

## Poland KSeF Rollout Timeline

For Poland KSeF Rollout Timeline, review these points before moving on.

- February 1, 2026: Mandatory KSeF e-invoicing begins for large taxpayers (annual turnover >200M PLN).
- April 1, 2026: Mandatory rollout expands to most VAT-registered active businesses in Poland, except the smallest sellers whose monthly invoice-documented sales do not exceed PLN 10,000 gross.
- January 1, 2027: The micro-taxpayer deferral ends and KSeF becomes mandatory for the previously exempt smallest sellers.
- B2C Exclusion: Consumer (B2C) transactions are currently excluded from mandatory KSeF clearing.
## Technical Core: FA(3) Schema & Verification QR Codes

Invoices must adhere to the FA(3) logical structure published by the Ministry of Finance. Visual invoice copies or PDFs provided to buyers must include a KSeF verification QR code.

## Offline & Emergency Modes (Tryb Awaryjny)

For Offline & Emergency Modes (Tryb Awaryjny), this sequence gives the practical order of work.

- Offline Mode: In the event of a KSeF system outage, issuers can generate FA(3) XML invoices offline and submit them to KSeF within specified statutory deadlines once service resumes.
## Official References

For Official References, review these points before moving on.

- [Polish Ministry of Finance - KSeF Portal](https://www.podatki.gov.pl/ksef)
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