Altinn II cutover 17 Nov; new 2025 top-up tax validations

System vendors got hard cutover dates for the Altinn 3 migrationSkatteetaten at Skatteetaten’s joint SBS meeting on 5 November 2026Skatteetaten: Altinn II roles are being phased out in three poolsSkatteetaten. Pool 1 cut off on 20 October for Kontroll SkatteetatenSkatteetaten; pool 2 cuts off on 17 November for A-meldingen, Skattemelding for formue og inntekt, Skattekort and Skatteoppgjør for formue og inntekt (person and næring)SkatteetatenSkatteetaten; pool 3 cuts off on 31 December for the remaining servicesSkatteetaten. Vendors and filers still on Altinn II roles must move to Altinn 3 access before each service goes darkSkatteetaten.

Submission mechanics change with the move. Filing via maskinporten or systembruker has been stopped in the Altinn3 app: only a logged-in user in the SBS or in Altinn with ID-porten or fødselsnummer can submit from the app now. A validation on the scope skatteetaten:formueinntekt/skattemelding is also coming to the signing steps in the Altinn3 app, applying from income year 2027Skatteetaten — not for the coming filing round — and vendors signing without the scope will be contacted after next year’s filing deadline.

The SME26 delivery calendar sets the vendor test windowSkatteetaten. A 0.9 version of the information model must be finished and ready for SBS testing by 30 NovemberSkatteetaten, with calculation logic and code lists finished and every breaking change completedSkatteetaten; later changes must be announced to the vendors and open to their influence. Version 1.0 freezes the data model on 15 JanuarySkatteetaten, with changes afterwards only when absolutely necessary and supported by the vendorsSkatteetaten. Assessment for UP and SDF opens on 4 FebruarySkatteetaten together with advance assessment for 2027 for UP and PSkatteetaten and the launch of the tax calculatorSkatteetaten, with submission-blocking validations in place.

Crypto reporting gains prefill: Skatteetaten has the legal basis to collect and prefill wealth values for cryptocurrency — not losses and gains — from Norwegian crypto exchangesSkatteetaten starting with income year 2026Skatteetaten. The portal and the model keep supporting both single-currency registration and aggregate reporting with totals, with a step model letting the taxpayer choose aggregate instead of or in addition to prefilled amounts, plus a new voluntary DTI field for the digital token identifier.

For the supplementary tax, the 2025 reporting round brings new disclosure and validation requirementsSkatteetaten because the tax-allocation rules (UTPR) apply from 2025Skatteetaten. Check the start date in Filing Info in the XML file: the validation service picks its rules from that dateSkatteetaten, so a wrong start date validates against the wrong rule set. The validation service will be updated with the 2025 rules during Q4 2026Skatteetaten, and it lets filers check the GIR message against Skatteetaten’s technical specifications before submission. Test data for income year 2026 is searchable now, with a larger prefill test set produced on 30 November after the model lockSkatteetaten — and no live data may enter the test environmentsSkatteetaten.