Base interest rate update
September 2026
As of 1 September 2026, the base interest rate according to IDW S 1 increases to 3.75% (rounded in accordance with the requirements of IDW S 1). As a key component in determining the discount rate, the base interest rate has a significant impact on business valuations performed under the IDW S 1 standard. To help you stay informed and make well-founded decisions, we provide regular updates on any changes and developments.
Base interest rate
overview
| Valuation date | Base interest rate |
|---|---|
| 01.09.2026 | 3,75 % |
| 01.08.2026 | 3,50 % |
| 01.07.2026 | 3,50 % |
| 01.07.2026 | 3,50 % |
| 01.06.2026 | 3,50 % |
| 01.05.2026 | 3,50 % |
| 01.04.2026 | 3,50 % |
| 01.03.2026 | 3,50 % |
| 01.02.2026 | 3,50 % |
| 01.01.2026 | 3,25 % |
| 01.12.2025 | 3,25 % |
| 01.11.2025 | 3,25 % |
| 01.10.2025 | 3,25 % |
| 01.09.2025 | 3,00 % |
| 01.08.2025 | 3,00 % |
| 01.07.2025 | 3,00 % |
| 01.06.2025 | 3,00 % |
| 01.05.2025 | 2,75 % |
| 01.04.2025 | 2,75 % |
| 01.03.2025 | 2,50 % |
| 01.02.2025 | 2,50 % |
| 01.01.2025 | 2,50 % |
| 01.01.2024 | 2,75 % |
| 01.01.2023 | 2,00 % |
| 01.01.2022 | 0,10 % |
Why is the base interest rate so important?
The base interest rate is a direct input into the calculation of the discount rate, which is used, among other things, to discount future cash flows. Changes in this parameter have an immediate effect on business valuation outcomes and can therefore influence important business and financial decisions.
Stay informed
Through our regular base interest rate updates, we keep you informed of the latest developments here in our Newsroom and across our social media channels. This helps ensure that your valuations are always based on current and reliable assumptions.
If you would like to understand how changes in the base interest rate may affect your specific valuation or business decisions, our experts will be pleased to assist you. Should you have any questions, please do not hesitate to contact us.