{"slug":"gst","name":"GST Calculator","category":"mba","tags":["tax","pricing","operations"],"tagline":"Add or extract GST — India slabs (5/12/18/28), Australia/NZ/Singapore/Canada rates.","endpoint":"https://xearno.tools/api/v1/tools/gst","page":"https://xearno.tools/t/gst","description":"GST both directions — exclusive to inclusive and back — with the Indian slab structure (5/12/18/28%) and the single-rate systems (Australia 10%, New Zealand 15%, Singapore 9%, Canada 5% federal) built into the rate picker.","inputSchema":{"type":"object","properties":{"mode":{"description":"Direction","type":"string","enum":["add","remove"],"default":"add"},"amount":{"description":"Amount","type":"number","minimum":0,"default":25000},"rate":{"description":"GST rate","type":"string","enum":["5","12","18","28","10","15","9"],"default":"18"}},"required":[],"additionalProperties":false},"methodology":["Inclusive = exclusive × (1 + rate); exclusive = inclusive ÷ (1 + rate). India uses slab rates (5/12/18/28% plus exempt and special categories); Australia 10%, New Zealand 15%, Singapore 9% (2024+), Canada 5% federal GST plus provincial taxes."],"usage":"POST https://xearno.tools/api/v1/tools/gst with a JSON body matching inputSchema."}