CSS in canton Solothurn: twelve years of premiums
In canton Solothurn, the lowest CSS premium went from CHF 323.70 a month in 2015 to CHF 516.30 in 2026 — a rise of +59.5 %. The table below places it next to the canton's cheapest insurer, year by year.
| Year | This insurer | The cheapest | Gap |
|---|---|---|---|
| 2015 | CHF 323.70 | CHF 288.10 | CHF 35.60 |
| 2016 | CHF 348.00 | CHF 306.60 | CHF 41.40 |
| 2017 | CHF 364.10 | CHF 347.90 | CHF 16.20 |
| 2018 | CHF 382.60 | CHF 357.20 | CHF 25.40 |
| 2019 | CHF 392.30 | CHF 371.70 | CHF 20.60 |
| 2020 | CHF 401.20 | CHF 378.00 | CHF 23.20 |
| 2021 | CHF 398.70 | CHF 380.20 | CHF 18.50 |
| 2022 | CHF 393.60 | CHF 390.80 | CHF 2.80 |
| 2023 | CHF 414.10 | CHF 404.10 | CHF 10.00 |
| 2024 | CHF 450.30 | CHF 419.80 | CHF 30.50 |
| 2025 | CHF 489.70 | CHF 445.00 | CHF 44.70 |
| 2026 | CHF 516.30 | CHF 486.20 | CHF 30.10 |
Faster or slower than the rest?
CSS rose +59.5 % over the period, against +68.8 % for the cheapest insurer in the same place. The gap narrowed — which does not mean this insurer is the cheapest today, only that it climbed more slowly.
The year that hurt — The steepest year-on-year jump was 2025: +8.8 % in one go.
Figures for an adult, CHF 300 deductible, accident cover included — the only profile defined identically across all twelve years. Each year this is the lowest premium the insurer offered, all models combined.
CSS, canton by canton
Other insurers
Source: Federal Office of Public Health (FOPH), premium files from 2015 to today.