The Avalara API
Tap into a powerful API to integrate your existing financial applications with Avalara’s transaction tax system.
One API for tax compliance
With a single, unified API for sales and use tax, VAT, cross-border transactions, and exemptions, Avalara puts a world of transaction tax solutions at your feet.
Real-time tax calculation
Avalara’s API enables lightning-fast tax calculation for transactions across tens of thousands of jurisdictions all over the world.
It's about precision
Regular updates of tax rates and rules lead to more accurate tax calculation for millions of products and services.
Exemptions made simple
It’s easy for customers to tie non-taxable transactions to applicable exemption certificates with an end-to-end tax document management solution.
Features and benefits
Make live API calls to calculate tax or validate an address before you even start to build your integration.
Get anytime access to comprehensive API references, including a detailed Developer Guide.
With SDKs for all the major programming languages, you don’t have to build your integration from the ground up.