2025-03-12·PL·KSeF
DELAYMandatory B2B start date postponed to Feb 2026
Ministry of Finance announced a technical audit requirement, pushing the deadline for large taxpayers to 1 February 2026.
Effective 2026-02-01Source
MANDEXA
System status
LIVE DATA SYNC
EI
All countriesPL · B2B PL · B2G
Poland
UpcomingKSeF national e-invoicing system; B2B mandate postponed after technical audit.
Europe · ISO PL · Last updated 2025-01-22
01
Country overview
Status
Upcoming
Maturity
Implementing
CTC model
Clearance
Go-live
2026
Peppol
Not used
E-reporting
Required
B2G
Mandatory
B2B
Phased
Feb 2026 (large) · Apr 2026 (others)
B2C
Not required
Taxpayers in scope
All VAT-registered taxpayers
Main authority
Ministerstwo Finansów
Next deadline
2026-02-01
KSeF mandatory for large taxpayers
02
Regulatory timeline
- Voluntary
KSeF voluntary phase opens
- B2B
Mandatory for large taxpayers
- B2B
Mandatory for other taxpayers
03
B2B requirements
B2B status
Phased — Feb 2026 (large) · Apr 2026 (others)
Detailed B2B requirements for Poland are being curated. The structure here will populate as the regulatory body publishes guidance.
04
B2G requirements
B2G status
Mandatory
Detailed B2G requirements for Poland are being curated. The structure here will populate as the regulatory body publishes guidance.
05
Mandatory invoice fields
Fields required for a compliant electronic invoice under the currently applicable specification.
Format
FA(3) — KSeF
Specification
FA(3), KSeF 2.0
Syntax
Proprietary XML (XSD, namespace crd.gov.pl)
Last verified
2026-08-01
Transaction
Requirement
| Field / Business term | ID | Requirement | Description |
|---|---|---|---|
| Document information | |||
| Form code and schema version | Naglowek/KodFormularza | mandatory | Identifies the FA schema variant and version used. |
| Data wystawienia | P_1 | mandatory | Invoice issue date. |
| Numer faktury | P_2 | mandatory | Sequential invoice number identifying the invoice uniquely. |
| Seller | |||
| Seller NIP | Podmiot1/NIP | mandatory | Polish tax identification number of the seller. |
| Seller name | Podmiot1/Nazwa | mandatory | Full name of the seller. |
| Seller address | Podmiot1/Adres | mandatory | Seller address incl. country code. |
| Buyer | |||
| Buyer name | Podmiot2/Nazwa | mandatory | Name of the buyer. |
| Buyer address | Podmiot2/Adres | mandatory | Buyer address. |
| VAT / Tax | |||
| Stawka podatku | P_12 | mandatory | VAT rate applicable to the line. |
| Podstawa opodatkowania i kwota podatku wg stawek | P_13_x / P_14_x | mandatory | Taxable base and VAT amount per rate band. |
| Invoice totals | |||
| Kwota należności ogółem | P_15 | mandatory | Total gross amount due. |
| Invoice lines | |||
| Nazwa towaru lub usługi | P_7 | mandatory | Name of the goods or services on the line. |
| Cena jednostkowa netto | P_9A | mandatory | Net unit price. |
| Wartość sprzedaży netto | P_11 | mandatory | Net line value. |
14 fields · valid from 2026-02-01 Official specification
06
Technical requirements
Accepted formats
FA(2) XML
XML standards
Pending curation
EN 16931 alignment
Pending curation
Peppol
Pending curation
Country-specific CIUS
Pending curation
Validation rules
Pending curation
Mandatory fields
Pending curation
Buyer reference
Pending curation
Seller / buyer identifiers
Pending curation
VAT number requirements
Pending curation
Endpoint identifiers
Pending curation
Transmission channels
KSeF APIWeb portal
APIs / portal
Pending curation
Digital signatures
Pending curation
Archiving format
Pending curation
Retention
Pending curation
07
VAT & tax calculation
VAT calculation reference for Poland is being curated. The same structure (rates, reverse charge, rounding, credit notes, corrections) will populate once available.
08
E-reporting / CTC
Clearance model — every invoice receives a KSeF number before delivery.
Required
Yes
Model
Clearance
09
Authorities & official links
Authorities
Format publishers & specs
- Ministerstwo Finansów — KSeF specs
https://www.podatki.gov.pl/ksef
10
News & updates
·PL·domestic
GUIDANCEInfolinia KSeF dostępna pod numerem telefonu 22 330 03 30
The Ministry of Finance in Poland provides a dedicated helpline for inquiries related to the National e-Invoicing System (KSeF).
Effective TBC · verified 2026-08-11Ministerstwo Finansów — KSeF
·PL·domestic
FORMATAplikacja Podatnika KSeF 2.0
Information about the KSeF Taxpayer Application 2.0, a free tool provided by the Polish Ministry of Finance to issue and receive structured e-invoices.
Effective TBC · verified 2026-08-11Ministerstwo Finansów — KSeF
·PL·domestic
FORMATAplikacja mobilna KSeF 2.0
Information about the KSeF mobile application 2.0, allowing taxpayers to manage e-invoices on mobile devices.
Effective TBC · verified 2026-08-11Ministerstwo Finansów — KSeF
·PL·domestic
GUIDANCEKSeF w praktyce - co zyskujesz?
An explanatory guide outlining the benefits of adopting the Krajowy System e-Faktur (KSeF) in daily business operations.
Effective TBC · verified 2026-08-11Ministerstwo Finansów — KSeF
·PL·domestic
GUIDANCEOd kiedy trzeba wystawiać faktury w KSeF?
Information explaining the implementation timeline and effective dates for the mandatory KSeF e-invoicing framework in Poland.
Effective TBC · verified 2026-08-11Ministerstwo Finansów — KSeF
·PL·domestic
GUIDANCEPoznaj wszystkie odpowiedzi na najczęściej pojawiające się pytania dotyczące KSeF
A comprehensive FAQ section addressing common taxpayer questions and doubts regarding the implementation of KSeF.
Effective TBC · verified 2026-08-11Ministerstwo Finansów — KSeF
·PL·domestic
GUIDANCEPierwsze konsultacje po częściowym wdrożeniu KSeF - podsumowanie
Summary of the first round of public consultations concerning the implementation, legislative changes, and development of KSeF.
Effective TBC · verified 2026-08-11Ministerstwo Finansów — KSeF
·PL·domestic
GUIDANCEZapraszamy na konsultacje dotyczące zmian w KSeF
An invitation from the Ministry of Finance for businesses and stakeholders to participate in public consultations regarding KSeF system modifications.
Effective TBC · verified 2026-08-11Ministerstwo Finansów — KSeF
·PL·domestic
FORMATPrace serwisowe na środowisku testowym i przedprodukcyjnym (Demo) Krajowego Systemu e-Faktur 2.0
A technical notice regarding planned maintenance on the KSeF 2.0 test and pre-production (demo) environments.
Effective TBC · verified 2026-08-11Ministerstwo Finansów — KSeF
11
Practical implementation notes
Implementation playbook for Poland will be added with ERP-perspective notes covering master data, onboarding, mapping, error handling, reconciliation and go-live risks.