Fiscal subject related
As a reminder, these invoices have the form of a file in XML format, generated in accordance with the logical structure published by the Ministry of Finance—the so-called XSD scheme. An e-invoice is issued by sending it to the KSeF, which verifies its formal correctness and, after positive validation, assigns it a unique number.
To summarize, mandatory dates are:
- January 1, 2024, is the date of the entry into force of mandatory e-invoices.
- Transition period 01/01/2022 - 31/12/2023 - voluntary use of e-Invoicing, this period has been planned as a "test" period
- 1 January 2024 - mandatory e-Invoices also for foreign entities with a fixed place of business for VAT purposes in Poland - the obligation to exclusively use invoices in a structured form has been imposed on taxpayers with their registered office and permanent place of business in Poland.
From the fiscalization perspective, it is stated that it is expected that from 2025 the possibility of issuing invoices using cash registers would cease to be available. Moreover, cash register receipts bearing the buyer’s tax identification number up to PLN 450 would no longer be treated as invoices. Therefore, after January 1, 2025, these invoices will not be considered invoices.
Also, penalties will apply from July 1, 2024, for failures to comply with the new obligations: a fine of up to 100% of the amount of VAT shown on the invoice or a fine up to 18.7% of the total amount due shown on the invoice.
Other news from Poland
Poland Sets 2027 Deadline: Simplified Invoices Must Move from Cash Registers to KSeF
Poland
Author: Nikolina Basić
Poland will temporarily allow simplified invoices issued from cash registers—including receipts with a buyer’s NIP—to remain outside the mandatory KSeF system until 31 December 2026. Starting 1 January 2027, all simplified invoices must be issued through KSeF, ending the option to generate them directly from cash registers. The introduction of the National e-Invoicing System (KSeF) in Poland is co... Read more
Pro Forma Invoices and E-invoicing: what changes after February 1, 2026?
Poland
Author: Nikolina Basić
Pro forma invoices will continue to be allowed as non-tax, purely informational business documents, but they will not be issued or processed in KSeF because they are not recognized as invoices under the VAT Act. From 2026 onwards, only legally defined VAT invoices will pass through KSeF, while pro formas may still be shared externally (PDF, email, systems) as offer or preview documents. For many y... Read more
New document was uploaded: S4F backoffice installer
S4F backoffice installer is intended for users who are installing the software for the first time. Please make sure to obtain latest version of installer and to apply all subsequent patches that are released subsequently. This package contains instruction, release notes, changelog and software packages required for deployment of this software component. This version of the Backoffice installer supports the following countries: Austria, Bulgaria, Croatia, France, Italy, Poland, Portugal, Romania, Slovakia and Slovenia. Read more
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Poland
Author: Nikolina Basić
On November 15, 2025, the Polish Ministry of Finance released the KSeF 2.0 Taxpayer Application demo for testing before its February 1, 2026, launch. Users can issue and manage invoices in a simulated environment. On November 15, 2025, the pre-production environment (Demo) of the KSeF 2.0 Taxpayer Application was made available by Polish Ministry of Finance. The demo version allows users to test t... Read more
Poland prepares for Mandatory B2B E-Invoicing with new KSeF Tools- Certificates and Authorizations Module (MCU)
Poland
Author: Nikolina Basić
Starting February 1, 2026, Poland mandates B2B invoicing via the National e-Invoice System (KSeF). To support this, the Ministry of Finance released key tools, including the MCU for managing access and digital certificates, which are essential for KSeF 2.0 access. Starting February 1, 2026, Poland will require businesses to use the National e-Invoice System (KSeF) for B2B invoicing. To help compan... Read more
E-invoicing in Poland: Ministry of Finance launches demo version of KSeF 2.0 API
Poland
Author: Nikolina Basić
Poland’s Ministry of Finance has launched the pre-production (Demo) environment for the new KSeF 2.0 API, enabling businesses and software providers to test integrations under real authentication conditions. The demo, accessible at ksef-demo.mf.gov.pl, mirrors live system functionality without legal effects, supporting companies in preparing for mandatory e-invoicing rollout The Ministry of Financ... Read more
Regulation update in Poland: expansion of software-based cash registers
Poland
Author: Nikolina Basić
Poland has expanded the scope of businesses eligible to use software-based cash registers under amendments effective April 1, 2026. The updated regulation adds sectors such as car washes, automated delivery systems, self-service ticketing, and electronic parking services, further advancing the country’s digital tax infrastructure modernization Poland’s authorities have officially published a... Read more