Compliance
KSeF deadlines — when the mandate applies to your company
The KSeF schedule has three entry thresholds and one deadline that applies to everyone regardless of size - and it is that last one that is most often missed. Answer two questions and you will see your dates, with a countdown to your own deadline.
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Your deadlines
Answer the questions to see your deadlines.
Will you make this deadline?
Start by finding the gaps with our KSeF readiness check. If an integration is needed, you get a ballpark instantly in our quote calculator and a reply from a human within 24 hours.
Run the readiness checkHow it works
- 01
Answer the question about scale
Whether your 2024 sales exceeded PLN 200m. That threshold defines the first group entering the system.
- 02
Clarify if you are a small taxpayer
Monthly gross sales up to PLN 10,000 move the issuing obligation to 2027.
- 03
See the full set of dates
Your issuing date, the receiving date that applies to everyone, the paper invoice cut-off, when penalties begin, and a countdown.
Assumptions and limits
- Issuing obligation: from 1 February 2026 for taxpayers whose 2024 sales exceeded PLN 200m; from 1 April 2026 for other businesses; from 1 January 2027 for the smallest taxpayers.
- The obligation to receive KSeF invoices applies to every taxpayer from 1 February 2026 - including those who only start issuing in April. It is the most commonly overlooked date in the whole schedule.
- The smallest taxpayers may use paper or other electronic invoices until 30 September 2026.
- No penalties for KSeF-related irregularities are foreseen throughout 2026. Penalties begin on 1 January 2027.
- This tool is not tax advice. The thresholds follow the statute, and interpreting borderline cases belongs to your accountant or tax adviser - especially for capital groups and businesses started mid-year.
Frequently asked questions
I am a small company - does KSeF apply to me at all? +
Yes, just later. The smallest taxpayers start issuing via KSeF on 1 January 2027 and may use paper invoices until 30 September 2026. But they must be able to receive KSeF invoices from 1 February 2026 - that applies to everyone.
What does "sales above PLN 200m" mean? +
It refers to 2024 sales value, which determines membership of the first group entering the system on 1 February 2026. For borderline cases and capital groups, confirm the classification with your accountant.
Are there really no penalties in 2026? +
KSeF-specific sanctions begin on 1 January 2027, so 2026 is a transition period. That does not remove the obligation itself to issue and receive invoices by the stated dates.
I have my dates - what next? +
Find the gaps with our KSeF readiness check - fourteen questions about systems, data and processes, ending with a gap list ordered by weight.
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Fourteen questions about systems, data and processes. You get a readiness score and a concrete list of gaps to close.
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Nine identifiers in one place: checksum, detected type and the reason for any error.
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