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TaxCalcs by TaxJar

Show how much sales tax should be collected at checkout

Last update: 18/08/2022
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Add automatic & comprehensive tax calculations to your orders based on the user’s location in the USA and Canada

Show how much sales tax should be collected at checkout
TaxCalcs by TaxJar

Make sales tax calculation simple and accurate.


The add-on is developed for the USA and Canada.

A TaxJar account must be created to use the add-on.

Please check the prices of TaxJar at https://www.taxjar.com/pricing...


The add-on integrates your store with the TaxJar service that allows you to calculate the taxes automatically for the state, county, city and special taxing district level. The taxes database of the service is regularly updated, so no worries about the sales tax calculation accuracy anymore.

Do you sell products that are taxed differently from state to state? TaxJar handles all that sales tax complexity so you never have to worry about it.

Key features

  • Accurate tax calculation for the USA and Canada.
  • Easy-to-use Tax information calculator will allow you to estimate the amount of tax for the product and its shipment.
  • Your vendors may use their own TaxJar account API key. It means that TaxJar transactions will be counted separately for your and their accounts.
  • You can use a different API key for each storefront.

What your customers will see

The category page


The product details page


The checkout page


What you will see in the admin panel

The fast Tax information calculator


The pop-up with Tax information


The add-on’s settings (Multi-store)


The add-on’s settings (Multi-Vendor)


The TaxJar API key setting on the Editing vendor page


The TaxJar API key setting on the Editing storefront page


User Guide

Learn more about the add-on in our User Guide.

Explore the TaxJar video tutorial to know more about the signing up in the TaxJar.


This add-on is developed and published by Simtech Development Ltd. You are guaranteed a quality add-on supported by future versions. If you need help, please contact us via our help desk system.

  • CS-Cart
  • Multi-Vendor
  • CS-Cart Ultimate
  • Multi-Vendor Ultimate
  • Multi-Vendor PLUS
Compatible versions
  • 4.15.1
  • 4.14.3
  • 4.14.2.SP1
  • 4.14.2
  • 4.14.1.SP1
  • 4.14.1
  • 4.13.3
  • 4.13.2.SP2
  • 4.13.2.SP1
  • 4.13.2
  • 4.13.1
  • 4.12.2
  • 4.12.1
  • 4.11.5
  • 4.11.4
  • 4.11.3
  • 4.11.2
  • 4.11.1
  • 4.10.4.SP1
  • 4.10.4
  • 4.10.3
  • 4.10.2
  • 4.10.1
  • 4.9.3
  • 4.9.2
  • 4.9.1
  • 4.8.2
  • 4.7.4
  • 4.6.3
  • 4.5.2
  • 4.4.3
  • 4.3.10
  • English
  • Русский
Matthew Hellinger
With recent legislative changes, a solution like TaxJar is the only practical solution for Internet merchants. Since TaxJar doesn't have native support for CS-Cart, this is your best and only option. Glad it's available!
I ran into a small issue getting the tax to display other than zero. Support was quick to help and worked me through a solution. Thanks!
I've been very happy with the TaxCalcs add-on. It's going to save me countless hours maintaining a tax table. It was easy to set up and integrate, and TaxJar has also been very good to work with. Great add-on. Definitely worth the money.

Who are we?

Simtech Development is a web development company launched in

Who are we?

Simtech Development is a web development company launched in 2005 and concentrating on the eCommerce market. We have already helped thousands of brands from 170 countries to launch, grow, optimize, and scale their business globally.

How does it work?

We offer complex solutions for eCommerce business designed to solve problems, overcome difficulties, find growth points, and take your business to a new level with CS⁠-Cart/Multi-Vendor -

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