KSeF penalty deferral through 2027? What the Ministry plans

On September 16, 2026, Poland's Ministry of Finance announced plans to defer penalties for errors in using KSeF until December 31, 2027. The proposal would give additional time both to the smallest taxpayers and to businesses already using the national e-invoicing system.

The extension requires a legislative amendment. As of September 23, 2026, the existing statutory commencement date for the administrative penalty provisions remains January 1, 2027. The announcement is not yet a deferral in force.

The announcement does not postpone mandatory KSeF or extend transitional relief for the smallest businesses. Preparations for issuing invoices must follow the rules governing that obligation, independently of the proposed penalty timetable.

The Ministry wants to extend the deferral of penalties for KSeF errors by another year. The smallest businesses would have more time to become familiar with the system after their transitional relief ends, while other taxpayers could improve their processes. The Ministry simultaneously maintains the obligation to use KSeF. Businesses therefore need to separate their implementation deadline from the date penalties begin to apply.

What the proposal means depends on the business. An issuer already covered by mandatory KSeF needs to improve everyday invoice handling. A business still using transitional relief needs to prepare its move into the system. A headline about the absence of penalties does not replace either decision.

Is the extended deferral already in force?

What would the proposal mean for two different businesses?

How will the tax administration respond?

What should you check in the bill and final law?

How can you use the time to improve invoicing?

Frequently asked questions

Record three dates separately when planning work: the start of your KSeF obligation, the expiry of any relief and the start of penalties. A proposed change to the last date does not automatically change the first two.

As of September 23, 2026, the Ministry's announcement is a legislative proposal, not a published amendment. The Ministry expressly states that the proposal requires changes to legislation and that work on a bill is beginning. That distinction matters when deciding how to invoice in 2027.

The existing provisions schedule Article 106ni(1)-(3) and (5)-(7) of the Polish VAT Act to take effect on January 1, 2027. The date follows from Article 23, point 4 of the Act of June 16, 2023, as amended on August 5, 2025. These administrative penalty provisions do not yet apply in 2026.

The Ministry's plan aims to keep the deferral in place throughout 2027. It does not itself determine the wording of the future provisions or guarantee that penalties will start on January 1, 2028. The final scope and dates must be established by enacted legislation.

The examples below are illustrative, not customer case studies. They show two different legal positions. Being a microbusiness does not itself provide an exemption from KSeF. Under Article 145m, the relevant figure is gross sales documented by eligible invoices issued during the month, together with whether the business has already lost its entitlement to the relief.

The design practice should assign someone to check rejected or still-processing invoices and address recurring errors. The sole trader should prepare access, permissions and a way to issue the first invoices covered by the obligation. These are different tasks prompted by the same announcement.

The announcement also does not extend the separate Article 145n exclusion for cash-register invoices and receipts bearing a tax ID that qualify as simplified invoices. Nor does it remove statutory exclusions such as consumer invoices. The January deadline should therefore not be described as covering every invoice without exception.

According to the announcement, Poland's National Revenue Administration, known as KAS, will primarily support taxpayers and remind them of their obligations. The Ministry also promises a response to invoices issued outside KSeF, allowing for statutory exclusions, and checks on whether failure to use the system is connected with inaccurate tax reporting.

Article 106ni(4) of the VAT Act is already in force and must also be considered. It prevents fiscal criminal or petty-offence proceedings from being initiated for the KSeF obligations specified in that provision. A deferred administrative penalty should therefore not automatically be replaced with the threat of fiscal criminal liability merely for bypassing the system.

This special rule is not a general exemption from liability for inaccurate declarations or fictitious invoices. Those are separate matters. Our guide to invoices issued outside KSeF explains the implications for issuers, buyers' VAT deduction and document handling in more detail.

After the announcement, follow the actual wording of the amendment. Four points will matter for business decisions:

1. Scope. Exactly which penalty provisions and breaches will the deferral cover?

2. Dates. When will the law take effect, and what transitional period will it establish?

3. Other obligations. Does the amendment change only penalties or other rules too? The current announcement does not postpone mandatory KSeF.

4. Legislative stage. Has the law been passed and published in the Journal of Laws?

A bill will make it possible to assess the proposed solution, but the published law will establish its final form. Preparations for mandatory invoicing should not depend on predicting when work on penalties will finish.

Decide who issues invoices, who checks submission and how the team handles a rejection. Distinguish a draft from a submitted document and an accepted invoice. For an accepted invoice, check the KSeF number and UPO, the official receipt.

The KSeFGPT invoice module lets you prepare an invoice in the form or AI Chat, submit it to KSeF and download a readable visualization for your customer. The screenshot below shows the application's acceptance screen with demonstration data. It illustrates the final process message; technical acceptance does not replace checking the tax treatment.

Base further decisions on your business's specific obligation and document process. These four guides cover the next steps:

Invoices outside KSeF and VAT deduction

Simplified invoices in KSeF and the PLN 10,000 threshold

KSeF for small businesses

Getting started with KSeF access and permissions