TaxCalcs by TaxJar

Show how much sales tax should be collected at checkout

$47.60 Old price: $68.00

This product is electronically distributed.

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


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., a CS-Cart developer. You are guaranteed a quality add-on supported by future versions. If you need help, please contact us via our help desk system.

Product type:
  • CS-Cart
  • Multi-Vendor
  • 4.15.2
  • 4.15.1 SP1
  • 4.15.1 SP2
  • 4.15.1 SP3
  • 4.15.1 SP4
  • 4.15.1
  • 4.14.3
  • 4.14.2. SP1
  • 4.14.1 SP1
  • 4.14.2
  • 4.14.1
  • 4.13.3
  • 4.13.2
  • 4.13.1
  • 4.12.2 SP1
  • 4.12.1
  • 4.11.5
  • 4.11.4
  • 4.11.3
  • 4.11.2
  • 4.11
  • 4.10.x
  • 4.9.x
  • 4.8.x
  • 4.7.x
  • 4.6.x
  • 4.5.x
  • 4.4.x
  • 4.3.5
  • 4.3.x

legend: [!] fixed  bug, [~] minor changes, [+] new functionality, [-] deleted functionality 


August 2022

v. 4.9.8

[added] API version is added to request header.

June 2022

v. 4.9.7

[fixed] Incorrect tax calculating occurred in case the order contains products of different vendors and the big discount is applied is fixed

June 2021

v. 4.9.6

[added] City name support is added to the delivery address bar of the TaxJar service

May 2021


[changed] The length of the tax code name string is changed for full display of the name without cutting the line

[added] Display of the sorted product tax code list is added

April 2021

Version v4.9.0.3

[changed] Instruction for API key extraction is fixed in accordance with updated taxjar web-site interface

[fixed] The state acquiring in default add-on settings for v. 4.12.1 and above is fixed

March 2021


[fixed] PHP Warning during the ordering is fixed by changes in settings

November 2019


[~] A placeholder for the ZIP field in the product properties has been added.


October 2019


[!] The Calculate tax button did not work in the product properties. Fixed.


February 2019


[+] The license and the update option via the upgrade center have been added.


December 2018


[~] The add-on has been adapted to the Responsive design of the admin panel.



[~] The TaxJar language variable has been renamed to the Sales Tax on the checkout page.

[!] The calculation did not work in the product card version 4.9.2 . Fixed.


October 2018


[+] The data about changes in the order is sent to TaxJar.

[+] The ability to choose statuses for sending information has been added.

[+] The ability to use CSV-export of orders to pass them to TaxJar has been added.


September 2018


[+] The ability to get the tax by 1 transaction has been added.

[+] The address fields has been added to requests sent to TaxJar.

[~] Tax calculation uses Nexus for all the states.

[~] A request is sent to TaxJar every time in spite of information about Nexus of other states which are saved in CS-Cart


March 2018


[!] The tax code on the frontend of the site was send up incorrectly. Fixed.


August 2017


[!] Now the tax for several items from the product options of one product added to a cart is calculated correctly


May 2017


[+] The add-on became compatible with CS-Cart 4.5.0 and above.


January 2017


[+] Check on the presence of a tax in the customer's state was created. 

[~] The add-on was renamed from SmartCalcs by TaxJar into TaxCalcs by TaxJar.

[-] Show the tax in percent setting was removed.