On 27 October 2026, Skatturinn published the detailed schedule and procedural framework for the 2026 corporate tax assessment, confirming that the final assessment for legal entities will take place on 30 October 2026. This publication, made under Article 14 of the Income Tax Act No. 90/2003 and Regulation No. 530/2004 on Tax Assessment Procedures, provides full transparency on the assessment timeline, data sources utilized, and the verification process for taxpayers. The assessment leverages pre-filled returns generated from the Register of Enterprises (RSK) database, which incorporates annual financial statements filed under the Annual Accounts Act, VAT returns, and employer-reported wage data. Skatturinn’s automated risk engine applies algorithmic checks for consistency, transfer pricing compliance, and adherence to the new interest limitation rules. The announcement underscores the mandatory use of electronic filing through the Skatturinn portal and the critical importance of reconciling financial statements with tax returns before the assessment date. Companies that have not yet submitted their 2025 annual accounts to the RSK face automatic estimation of taxable income based on industry benchmarks, potentially resulting in higher assessed liabilities. The publication also outlines the coordination with the Directorate of Customs for cross-border transactions subject to VAT and customs duties, ensuring alignment with the EU VAT Directive as applicable under the EEA Agreement.
Key Takeaways
- Assessment Date Confirmed and Data Sources: The final corporate tax assessment for the 2025 income year is fixed for 30 October 2026, with no extensions granted for late submissions. Skatturinn utilizes data from the RSK, annual financial statements, VAT returns, and payroll reports to pre-populate returns. Companies must validate the accuracy of pre-filled figures by 25 October 2026 via the digital portal; any corrections submitted after this date will not be reflected in the final assessment and must be addressed through the appeals process.
- Pre-filled Returns and Verification Requirements: The pre-filled return system covers over 95% of corporate taxpayers. Entities are required to review pre-assessed revenue, deductible expenses, tax depreciation, and carryforward losses. Special attention is needed for transactions with related parties, where transfer pricing documentation must be contemporaneous and available upon request. The assessment also incorporates the new mandatory disclosure rules for aggressive tax planning arrangements under Article 103a of the Tax Administration Act.
- Appeal Rights and Post-Assessment Compliance: Taxpayers have 30 days from the assessment notice date to file an administrative appeal with the Tax Appeals Committee if discrepancies are identified. The appeal must be submitted electronically with a detailed statement of grounds and supporting evidence. Pending appeal decisions, the contested tax amount is deferred from enforcement, though interest continues to accrue on any ultimately upheld liability. Companies should also prepare for the upcoming Pillar Two top-up tax obligations by ensuring constituent entity data is accurately recorded in the RSK.
Disclaimer: This article is compiled and summarized by the AI based on publicly available information and is for general information purposes only. It does not constitute any form of formal tax advice, legal opinion, or basis for performance. Please consult a qualified professional tax advisor or legal counsel for tax advice.
Source: Read Official Announcement