KSeF check · 2 minutes

Is your company ready for KSeF?

Eight questions to measure your readiness before 1 January 2027, when KSeF becomes mandatory for everyone and the KSeF number enters bank transfers. You'll see your score and what is missing.

1 Are you already issuing your invoices through KSeF?

Issuing has been mandatory since 1 February 2026 (2024 sales above PLN 200 million) or since 1 April 2026 (everyone else). Until 31 December 2026, invoiced sales of up to PLN 10,000 gross a month may stay outside KSeF.

2 How do you receive your suppliers' invoices?

Since 1 February 2026, invoices between businesses in Poland arrive through KSeF. What matters is that they flow straight into your accounts and approval workflow.

3 Which system do you invoice from?

A native integration cuts errors and manual work. With several systems, each one needs its own connection and controls.

4 Are your KSeF permissions and certificates set up?

Each user and integration should only have the permissions it needs. KSeF certificates are valid for two years at most, so keep an eye on expiry dates.

5 Do you have a procedure for when KSeF or your system is down?

The law provides for offline24 mode, a KSeF unavailability mode and an emergency mode, each with its own deadline for sending the invoices afterwards. Issuing offline requires a type 2 KSeF certificate.

6 Have you tested your integration in the KSeF TEST or DEMO environments?

The Ministry of Finance provides test environments with no tax effect. Test corrections, rejections, foreign-currency invoices and lost connections, not just the happy path.

7 Do you store each invoice's KSeF number for your payments?

From 1 January 2027, transfers between active VAT payers, including split payments (MPP), must quote the invoice's KSeF number or a collective identifier generated in KSeF.

8 Is your accountant working with KSeF in step with you?

Your accounting firm or finance team needs KSeF permissions or a sync with its software, plus clear rules on who issues, who downloads and who reviews.

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