How the deductible and retention work
You pay the first francs of your costs each year yourself until the chosen deductible is reached: CHF 300 to 2'500 for adults, CHF 0 to 600 for children.
Of the costs above the deductible, you pay 10 %, up to a maximum of CHF 700 per year (children CHF 350). The insurer covers the rest.
The higher the deductible, the lower the premium. Each insurer sets the size of the discount itself, which is why it pays to do the maths.
Deductible of CHF 2'500 and costs of CHF 4'000 in the year: you pay the CHF 2'500 deductible plus 10 % of CHF 1'500, i.e. CHF 150 retention. Together that is CHF 2'650; the insurer covers CHF 1'350.