{"country":"pl","currency":"PLN","name":"Poland","taxYear":2026,"description":"Polish B2B Tax Calculator (ZUS, health insurance, PIT)","parameters":{"income":{"type":"number","required":true,"description":"Gross income in PLN"},"incomePeriod":{"type":"string","default":"monthly","options":["monthly","yearly"]},"taxationType":{"type":"string","default":"lumpsum","options":["lumpsum","linear","scale"]},"lumpSumRate":{"type":"number","default":12,"options":[2,3,5.5,8.5,10,12,14,15,17]},"zusRate":{"type":"string","default":"normal","options":["normal","preferential","start","none"]},"sickInsurance":{"type":"boolean","default":false,"description":"Include chorobowe (2.45%)"},"costs":{"type":"number","default":0,"description":"Monthly business costs PLN"},"paidDaysOff":{"type":"number","default":26,"description":"Vacation days/year"},"weeklyHours":{"type":"number","default":40,"description":"Weekly working hours"},"zusBase":{"type":"number","default":60,"description":"ZUS base as % of avg salary"},"sickDays":{"type":"number","default":0,"description":"Days on sick leave"},"vatPayer":{"type":"boolean","default":true,"description":"Include VAT calculation"}},"example":"/v1/calculate/pl?income=10000&taxationType=lumpsum&lumpSumRate=12"}