Build for your business. Leave sales tax to us.

Accurate Sales Tax Calculations

No more building tax tables and dealing with ever-changing sales tax rates. Get precise sales tax rates & calculations so you charge the right amount of sales tax, every time.

Sandbox Environment

Automatically generate live and test API tokens
after signing up. Works with continuous integration
tools to ensure your specs are always passing.


Easy to Use and Developer Friendly

SmartCalcs™ uses modern, RESTful APIs to save you
time and hassle. Implementation is easy. Up and
running in minutes, with no contracts or setup fees.

High Performance & Reliability

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


At TaxJar, we’re different.

We’re the fastest growing sales tax solution in the world We were built for modern the multi-channel eCommerce business We are a technology-first and customer-focused company


How TaxJar saves the your development team time


SmartCalcs™ is a modern, RESTful API that supports all major code languages
Share our API Demo with your development team
Browse our entire API Reference for technical details


Quickstart guides for Ruby, Python, PHP, Node, C#/.NET, and Java
Use the Transactions endpoint send a request for a calculation
Getting your API token and creating your trial account
Pre-built eCommerce integrations to Shopify, Magento, Amazon, Walmart & more


Expanded 24/7 support hours and guaranteed uptime SLA of 99.99%
Easily handle multiple sales channels in a single TaxJar account
✓ Enroll in AutoFile to seamlessly file returns & remit payment to any state
Data archive access for previous years sales tax reports and returns
Find out how TaxJar Plus stacks up against competitors. Visit to compare
No annual contracts or additional fees


Super-simple API integration to add tax handling to a web application

TaxJar was very easy for us to implement, didn't require hoops and red tape to get setup, and has been foolproof for us so far. The error messages...have been clean and easy to correct. It's a great comfort knowing we don't have to worry about the tax implications of transactions -- we just submit the data to TaxJar and they tell us how much to charge. Awesome!

-Capterra Verified Reviewer

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