{"country":"nl","currency":"EUR","name":"Netherlands","taxYear":2026,"taxYearPeriod":"January - December 2026","description":"Dutch ZZP: Box 1 Income Tax, Zelfstandigenaftrek, MKB-vrijstelling, ZVW","parameters":{"income":{"type":"number","required":true,"description":"Gross business profit EUR"},"incomePeriod":{"type":"string","default":"yearly","options":["monthly","yearly"]},"starter":{"type":"boolean","default":false,"description":"First 3 of 5 years as entrepreneur"},"hoursExempt":{"type":"boolean","default":false,"description":"True if NOT meeting 1225 hours criterion"},"vatRegistered":{"type":"boolean","default":true,"description":"BTW registered (21%)"},"weeklyHours":{"type":"number","default":40,"description":"Weekly working hours"},"paidDaysOff":{"type":"number","default":25,"description":"Annual leave days"}},"example":"/v1/calculate/nl?income=60000"}