Sales Tax Calculator API
Calculate tax from transaction details, save completed transactions, record adjustments, submit batches, and check coverage. Start with the quickstart or browse the API endpoints.
Make your first API requestSet an API key, send a request, and read the returned outcome.Open quickstart Browse the API referenceSee every request, response, parameter, and runnable example.View endpoints Install an SDKUse the official Node.js or Python client on your server.Choose an SDK
API reference
Each endpoint has its own page with request and response examples and a live request panel.
Calculations
Calculate tax from transaction facts and retrieve a saved result.
Transactions and adjustments
Record completed sales, refunds, credits, and corrections.
POSTCreate transaction
/v1/transactionsGETRetrieve transaction/v1/transactions/{transaction_id}POSTCreate adjustment/v1/transactions/{transaction_id}/adjustmentsGETList adjustments/v1/transactions/{transaction_id}/adjustmentsGETRetrieve adjustment/v1/transactions/{transaction_id}/adjustments/{adjustment_id}Calculation batches
Submit multiple calculations in one request and track their results.
Coverage
Check a dated country, product, and transaction combination.