Poland eInvoicing Rollout

Last updated: 6 May 2026

Poland’s National eInvoice System (Krajowy System e‑Faktur, or KSeF) is entering its final implementation phases. Following delays and legislative refinements, the Polish Ministry of Finance issued an official announcement on 26 March 2026, confirming the second stage of the KSeF rollout and clarifying which taxpayers are required, or permitted, to use the system during 2026.

Below is the latest and complete overview of the KSeF rollout, including mandatory dates, voluntary phases, exemptions and clarifications that every business operating in Poland should be aware of.

What is KSeF?

KSeF is Poland’s centralised electronic invoicing platform for issuing and receiving structured eInvoices. Once mandatory, invoices within scope must be:

• Issued in a structured XML format
• Transmitted via KSeF
• Assigned a unique KSeF identification number
• Stored centrally by the tax authorities

The system is a key part of Poland’s broader VAT digitalisation and compliance strategy.

Key announcement: Second stage of KSeF

On 26 March 2026, the Ministry of Finance confirmed the phased expansion of KSeF usage throughout 2026 and reiterated key compliance points for taxpayers.

KSeF timeline

1 February 2026 – Obligation to receive invoices via KSeF

Since 1 February 2026, taxpayers have been required to receive invoices through KSeF, even if they are not yet obliged to issue invoices via the system.

This means that suppliers issuing structured invoices through KSeF can validly deliver them electronically to recipients using the platform.

1 April 2026 – Optional use for smaller businesses

From 1 April 2026, businesses with annual sales not exceeding PLN 200 million in 2024 are permitted (but not required) to issue invoices via KSeF.

This marks the start of the second implementation stage, allowing a broader group of taxpayers to voluntarily adopt KSeF ahead of full mandation.

No penalties until end of 2026

The Ministry of Finance confirmed that no penalties will be imposed for errors in using KSeF until 31 December 2026.

This penalty‑free period is intended to give businesses time to stabilise processes, train staff and resolve technical issues without enforcement risk.

April – December 2026: Additional voluntary groups

Between April and December 2026, KSeF remains voluntary for the following taxpayers and transaction types:

1. Low‑value monthly invoice issuers

Taxpayers whose monthly sales documented by invoices within KSeF scope do not exceed PLN 10,000.

2. Cash register transactions and simplified invoices

Transactions documented via cash registers, including:

• Fiscal receipts with the buyer’s tax identification number (NIP)
• Treated as simplified invoices
• Up to PLN 450 or €100

This applies even to taxpayers generally required to issue structured eInvoices. Until 31 December 2026, these invoices may still be issued electronically or in paper form.

1 January 2027

From 1 January 2027, the obligation to issue invoices via KSeF becomes mandatory for all taxpayers and transactions within scope, unless an explicit exemption applies.

From this date:

• Structured eInvoices via KSeF become the default
• Alternative invoice formats will no longer be accepted where KSeF applies
• Penalties for non‑compliance may be enforced

Who is outside the KSeF obligation?

KSeF does not apply mandatorily, but voluntary participation is allowed, for:

• Non‑established entities registered for VAT in Poland that:
  • Do not have a registered office or fixed establishment in Poland, or
  • Have a Polish fixed establishment that does not participate in the invoiced transaction

• B2C supplies

KSeF does not apply at all (mandatory or voluntary) to taxpayers using the following special VAT schemes:

• Non‑EU One‑Stop Shop (OSS) scheme
• Import One‑Stop Shop (IOSS)
• Scheme for international occasional road passenger transport services

Transactions excluded from KSeF

Under the Regulation of the Minister of Finance and Economy of 7 December 2025, KSeF does not apply (but may be opted into) for selected transactions subject to invoicing simplifications or specific self‑billing cases. These include:

Simplified or sector‑specific transactions

• Toll motorway services documented by receipts containing a NIP and treated as invoices
• Passenger transport services documented by tickets recognised as invoices, such as:
  • Rail
  • Road
  • Inland waterway
  • Air transport

• Air navigation and supervision services subject to route charges (e.g. Eurocontrol invoices)
• VAT‑exempt financial and insurance services documented using simplified invoices with a reduced data scope

Self-billing arrangements

KSeF does not apply (option to opt in) to certain self‑billing scenarios, particularly where:

• The purchaser issuing the invoice is not identified by a NIP, or
• The supplier authorising self‑billing is not identified by a NIP for the relevant activity

What businesses should do next

With mandation coming into force in January 2027, businesses should use 2026 to:

• Validate ERP and invoicing system readiness
• Map which transactions fall inside and outside KSeF scope
• Train accounting and tax teams
• Test voluntary KSeF issuance where permitted
• Review self‑billing and simplified invoicing setups

Early preparation reduces disruption and avoids compliance risk once penalties apply. Read out blog on how to prepare for the Poland rollout.

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