On 22 September 2026, the Swiss Federal Tax Administration (ESTV) issued its annual circular on the adjustment for cold progression and interest rates for direct federal tax for the 2027 tax year. The circular formalizes the 0.47% inflation adjustment announced by the EFD, detailing the revised tax brackets, deduction amounts, and interest rates. The adjustment is calculated based on the Swiss consumer price index (CPI) change since the last adjustment in 2023. The circular also confirms that the late payment and refund interest rate remains at 4.0% and the advance payment compensation interest at 0.0%. This circular is binding for all federal and cantonal tax authorities and serves as the technical implementation guide for the 2027 tax assessments.
The circular provides the detailed methodology for applying the cold progression adjustment. The EFD uses the CPI published by the Federal Statistical Office, comparing the annual average of the previous year with the base year of the last adjustment. For 2027, the base year is 2023, and the CPI increase is 0.47%. This percentage is applied to all tariff parameters: the tax brackets, the basic deductions, the child deductions, and other allowances. The circular includes annexes with the revised tariff tables for single taxpayers, married couples, and single parents. It also addresses the interaction with the cantonal tax harmonization law (StHG), noting that cantons are free to adopt the federal adjustment or set their own. The interest rate decision is based on the EFD’s assessment of the capital market situation; the 4.0% late payment rate is intended to discourage delayed payments without being punitive. The circular is published in the Official Compilation of Federal Legislation and enters into force on 1 January 2027.
Key Takeaways
- Technical Implementation of Tariff Adjustment: The circular provides the exact percentage increases for each tariff bracket and deduction category, enabling cantonal tax software vendors to update their systems. The adjustment applies uniformly across all income levels, preserving the progressive structure of the direct federal tax.
- Interest Rate Stability: Maintaining the 4.0% late payment interest rate ensures that the cost of delayed tax payments remains a deterrent, while the 0.0% advance payment interest reflects the current low-interest environment. Taxpayers should factor these rates into their cash flow planning for 2027.
- Binding Guidance for Assessments: The circular is effective immediately and governs provisional and final assessments for the 2027 tax year. Cantonal tax offices must apply the new parameters when issuing tax rulings and processing returns. The ESTV also provides a FAQ document addressing common questions on the transition.
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