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  7. KSeF 2.0 after the 9 June consultation: the API and auth tokens are still moving

KSeF 2.0 after the 9 June consultation: the API and auth tokens are still moving

Regulatory·11 June 2026·2 replies·6 likes·Last post 12 June 2026·Reply

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Lauren D.11 June 2026
Anyone else sit in on the KSeF consultation on 9 June? Two things came out of it. The business event model and the sync mechanism in the 2.0 API are both still moving, so I would not hard code against what is there today. And they are proposing to keep auth tokens going past 31 December, valid for anything from 1 to 365 days, which would save a lot of grief.
Sandra K.11 June 2026
Does the 2026 grace period follow the micro entrepreneurs into January, or are they in the penalty regime from day one?
Marco B.12 June 2026
Day one, going by the published plan. Grace runs out on 31 December and penalties start on 1 January 2027, the exact date micro entrepreneurs come into scope. No cushion at all for that group. Up to 100 per cent of the VAT on the invoice, so worth raising it with them now rather than in December.

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Penalty Update
23 Sept 2026

Draft bill UD477 would start KSeF penalties on 1 January 2028

The government published draft bill UD477 , which would bring the KSeF penalty provisions in article 106ni of the VAT Act into force on 1 January 2028 instead of 1 January 2027. The draft reached the Standing Committee of the Council of Ministers on 12 October 2026 and is not yet law, so penalties of up to 100% of the invoice VAT remain scheduled for 1 January 2027 until it is enacted.
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