SmartCalcs^™ Sales Tax API

No more building tax tables and dealing with ever-changing sales tax rates in thousands of sales tax districts. Get precise sales tax rates & calculations at the state, county, city and special taxing district level so you charge the customer the right amount of sales tax, every time.

Sales tax is so complicated because every state is different. Some states require that merchants charge sales tax on shipping charges, others don’t. TaxJar’s SmartCalcs API factors this in so you don’t have to.

More states, more complexity. No matter in how many states you have to charge sales tax, TaxJar has you covered.

Certain products types, like food or clothing are taxed at a lower rate or even tax exempt in some states. SmartCalcs handles complicated product-level taxability so you never have to worry about customizing sales tax rates.

TaxJar Reports is included for all sales tax API transactions. Get jurisdiction-level sales tax reporting in every state to make sales tax tracking and filing simple. Additional fees apply for sellers who want TaxJar Reports for other sales channels like Amazon or eBay.

Some states have “origin-based” sales tax sourcing. Others are “destination-based.” TaxJar’s SmartCalcs API comes handles complicated sales tax sourcing rules so you never have to worry about it.

SmartCalcs supports not just sales tax in the US, but 30 more countries around the world including VAT in the EU and Canada. We even include support for reduced-rate and super reduced-rate product categories. Need support for other countries? Tell us!

SmartCalcs uses modern, RESTful APIs to save you time and hassle. Implement in minutes, and forget about contracts or set-up fees. Look over our documentation for more info on just how easy it is.

Run automated tests against our API sandbox to perform sales tax calculations and validate unique transaction scenarios. It works great with continuous integration tools to ensure your specs are always passing. Automatically generate live and test API tokens after signing up.

Our sales tax API clocks in at sub-75ms with 99.99% uptime. Check our status page for the breakdown.