CCH SureTax Developer Portal
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CCH SureTax Developer Portal
Help
One contract, every jurisdiction — domestic and VAT tax calculation, unified
The Common Calculation API provides a single, canonical request and response contract for calculating tax on any transaction. The API automatically applies the correct jurisdictional tax rules based on the seller and buyer details in your request and returns a unified result. Use this guide to integrate tax calculation into your applications quickly and accurately, regardless of where your transactions occur.
Get your first tax calculation running in minutes. Covers authentication and response handling.
Full request/response schema for the Calculate Tax operation, including VAT-specific fields, enumerations, and code samples.
Real-world scenarios including domestic retail sales, cross-border B2B VAT reverse charge, and credit memo adjustments.