Avalara AvaTax API
Sales tax calculation for financial applications

Avalara AvaTax provides cloud-based sales and use tax calculation with comprehensive, regularly updated tax rates pushed to your financial systems.

Calculate more accurate rates
Sales and use tax rates are complex and vary across tax jurisdictions. AvaTax applies rates based on geolocation, not just ZIP code.
Validate addresses
Catch and correct keystroke errors to avoid incorrect tax rates and ensure invoices and packages get to where they need to go.
Manage exempt sales
Collect and apply exemption certificates at the point of sale, regardless of whether your customers purchase in person, over the phone, or online.
Apply special tax rates
AvaTax adjusts calculations for a variety of circumstances, including product-specific tax rates, sales tax holidays, shipping and handling rules, and more.
Integration Guide
Ecommerce
One solution to calculate rates, prepare returns, and manage documents, no matter your size or industry.
card bg
Ready to get started?
Already have an account? Explore our developer documentation to learn how to build an AvaTax integration for your system. Make live calls directly from our API documentation.
Get a free trial account
Try the AvaTax API at no cost for 60 days. This account will allow you to get started right away and enjoy full access to our production environment.
Get Support
Check out our Developer Support page to review additional documentation, submit a case, view webinars, and more.