{"country":"ch","currency":"CHF","name":"Switzerland","taxYear":2025,"taxYearPeriod":"January - December 2025","description":"Swiss self-employed (Selbstständig) tax calculator with federal progressive tax, cantonal tax, and AHV/IV/EO social insurance","parameters":{"income":{"type":"number","required":true,"description":"Annual gross income in CHF"},"incomePeriod":{"type":"string","default":"yearly","options":["monthly","yearly"]},"expenses":{"type":"number","default":0,"description":"Annual deductible business expenses"},"cantonalRate":{"type":"number","default":0.12,"description":"Effective cantonal/municipal tax rate (0-1). Default 0.12 approximates Zurich"},"vatRegistered":{"type":"boolean","default":false,"description":"MWST registered (8.1%)"},"weeklyHours":{"type":"number","default":40,"description":"Weekly working hours"},"paidDaysOff":{"type":"number","default":25,"description":"Annual leave days"}},"example":"/v1/calculate/ch?income=120000"}