Poland’s Ministry of Finance has announced plans to extend the period during which financial penalties for errors related to the use of the Krajowy System e-Faktur (KSeF) will not apply until 31 December 2027.
The decision represents a significant extension of the transitional approach accompanying Poland’s mandatory e-invoicing rollout. Importantly, however, the extension concerns penalties — not the obligation to use KSeF.
The Ministry said the measure responds to requests from businesses, industry organisations and tax professionals seeking additional time to adapt processes to the new system.
KSeF Is Already Being Rolled Out
Mandatory KSeF has been introduced in stages during 2026.
The obligation to issue invoices through KSeF started on 1 February 2026 for businesses whose gross sales exceeded PLN 200 million in 2024. It was extended from 1 April 2026 to other businesses and entities required to issue invoices, subject to specific exceptions.
The smallest businesses benefit from a further transitional period. Businesses whose monthly sales documented by invoices do not exceed PLN 10,000 gross can continue issuing invoices outside KSeF until the end of 2026.
From 1 January 2027, this transitional exception ends, meaning KSeF will also become mandatory for this remaining group of businesses.
Penalties Deferred for Another Year
Under the existing framework, 2026 has effectively operated as a transition year in relation to KSeF penalties.
The Ministry has now decided to extend this approach for another year, with penalties for errors connected with the use of KSeF deferred until 31 December 2027.
This is particularly relevant because the final group of smaller businesses enters mandatory KSeF from January 2027. The additional penalty-free period is intended to give these taxpayers time to learn the system and adapt their business processes without immediately facing financial sanctions for mistakes.
The extension also gives businesses already operating within KSeF additional time to improve their invoicing processes and system integrations.
Deferral Does Not Mean KSeF Is Optional
One of the most important aspects of the announcement is the distinction between deferring penalties and deferring the KSeF mandate.
The Ministry explicitly states that the postponement of penalties does not remove the obligation to use KSeF.
During 2027, the Polish National Revenue Administration (KAS) intends to focus primarily on supporting taxpayers in correctly using the system and reminding them of their obligations under the VAT legislation.
However, the authorities will still respond where businesses issue invoices outside KSeF despite being legally required to use the system, except where an applicable statutory exception exists.
The tax administration may also examine whether failure to use KSeF is connected with incorrect or unreliable VAT reporting.
This means businesses should not interpret the extended penalty deferral as a general compliance holiday.
What Errors Are Relevant?
Under the KSeF penalty framework, financial sanctions are associated with failures such as:
- not issuing a structured invoice through KSeF when required;
- issuing an invoice during a KSeF failure or unavailability period in a format inconsistent with the prescribed structure; and
- failing to transmit an invoice issued under offline procedures or during system failure or unavailability within the required deadline.
The existing rules had contemplated these penalties applying from 1 January 2027. The Ministry’s latest announcement would effectively move their application back by another year.
Legislative Changes Are Still Required
The extension is not yet simply an administrative switch.
The Ministry of Finance confirmed that implementing the new penalty timetable requires legislative amendments. It is therefore beginning work on a draft law so that sufficient time is available for the legislative process.
Businesses should consequently monitor the forthcoming legislation for the detailed wording and scope of the extended protection.
What Businesses Should Do During 2027
The additional year should not be viewed as a reason to delay KSeF implementation.
For tax and finance teams, 2027 instead provides an extended period in which to stabilise operational processes before the penalty regime becomes effective.
Particular attention should remain on ERP and invoicing-system integration, invoice validation, KSeF authorisations, exception handling, offline procedures, reconciliation and controls over invoices that fail to reach KSeF correctly.
Businesses should also ensure that operational teams understand the distinction between technical errors that may benefit from the penalty deferral and the underlying legal obligation to issue invoices through KSeF.
For multinational groups, the extension provides additional time to identify weaknesses in local Polish implementations and improve governance between tax, finance, IT and external software providers.
A Softer Transition, Not a Delayed Mandate
The Ministry’s announcement represents a more gradual approach to enforcement rather than another postponement of Poland’s e-invoicing programme.
KSeF remains mandatory according to the phased implementation timetable, and the final transitional group is expected to enter the system from 1 January 2027.
What changes is the enforcement timeline.
By proposing to defer KSeF-related financial penalties until the end of 2027, Poland is effectively creating an additional year in which businesses can operate under the mandatory system while continuing to refine their processes before the dedicated penalty regime applies.
For companies, that distinction is critical: the deadline for compliance remains, but the period for getting the implementation right has become longer.