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Avalara Avatax Integration

This CS-Cart add-on provides integration with Avalara's tax calculation service Avatax to simplify your complex tax calculation scenarios. It supports tax calculation for checkout as well as returns, and supports both an Avatax sandbox environment (for testing) as well as live environment (for production).
UbiquiCode
Reviews: 3
Last update: 20.04.2026 Supports current CS-Cart version
$150.00
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Avalara Avatax Integration
$150.00

This CS-Cart add-on provides integration with Avalara's tax calculation service Avatax to simplify your complex tax calculation scenarios. It uses their latest APIs for best performance, and supports both an Avatax sandbox environment (for testing) as well as live environment (for production).

This add-on supports:

  • Tax calculations on checkout
  • Tax calculations for returns via CS-Cart's RMA functionality.
  • Custom tax codes set on products / categories / shipping
  • Custom tax exempt code for users

Requires an Avalara account (production or sandbox).

Current version requires PHP 8.0+. If you are running a PHP 7.4, or an older version of CS-Cart, please contact us and we can provide a compatible version.

Note: This add-on and its code are in no way affiliated with Avalara (the company) or Avatax, or its official add-on codebase (which currently does not support the latest versions of CS-Cart).

Payment type
One-time payment
Product
  • Store Builder
  • Store Builder Ultimate
  • Multi-Vendor
  • Multi-Vendor Ultimate
Compatible versions
  • 4.20.1
  • 4.19.1.SP2
  • 4.19.1.SP1
  • 4.19.1
  • 4.18.4
  • 4.18.3
  • 4.18.2.SP1
  • 4.18.2
  • 4.18.1.SP1
  • 4.18.1
  • 4.17.2.SP3
  • 4.17.2.SP2
  • 4.17.2.SP1
  • 4.17.2
  • 4.17.1
  • 4.16.2
  • 4.16.1
  • 4.15.2
  • 4.15.1.SP4
  • 4.15.1.SP3
  • 4.15.1.SP2
  • 4.15.1.SP1
  • 4.15.1
  • 4.14.3.SP1
  • 4.14.3
  • 4.14.2.SP1
  • 4.14.2
Julie Hall
Verified purchase
Comment
I don't normally give out 5 star reviews, but we've been very impressed with the responsiveness and support this add-on developer has provided. They helped us with customizing our theme so the data would appear the way we wanted it, understood issues we raised and addressed them quickly, and always gave us honest and straight forward answers. It's exactly the kind of support I want, and seldom get, but Ubiqicode delivers. They earned this rating.
Kevin Weaver
Verified purchase
Advantages
Supports latest CS-Cart versions.
Straightforward install & setup.
Great support.
Disadvantages
None/
Comment
If you use Avalara for tax calculation and a recent version of CS-Cart, you *NEED* this add-on. Avalara has dropped support for their AvaTax add-on and it no longer works with CS-Cart's latest versions.

Ubiquicode has developed a replacement add-on that exceeds Avalara's own solution and is fully compatible with the latest versions of CS-Cart. Stop trying to make Avalara's old code work - just get this add-on.

The add-on handles all types of transactions and returns detailed tax information for every item and taxing authority for an order.

Ubiquicode is very responsive to support requests and knowledgeable about Avalara and CS-Cart's inner workings.

We are extremely satisfied.
Isabella Corriere
Advantages
- Simplifies tax management and collection.
- Easy to set-up
- Fantastic customer service team
Disadvantages
None!
Comment
The Avalara Avatax Integration add-on is an absolute must-have for any CS Cart store!

It simplifies tax compliance and calculation by integrating seamlessly with Avalara’s Avatax, ensuring everything is fully automated and accurate. This not only saves us hours of manual work in CS Cart but also streamlines our overall tax management.

Setup is quick and easy, as tax codes can be applied to individual products and categories with ease.

What really sets this add-on apart is the outstanding customer service. The team was responsive, incredibly helpful, and made the entire setup process seamless. Their professionalism made this our best experience with CS Cart developers.

If you're looking for hassle-free tax management, this add-on is perfect. We highly recommend it!
UbiquiCode UbiquiCode
A small development team writing the best code to power your digital experiences. With numerous

Contact information

Email
info@ubiquicode.dev
Website
https://ubiquicode.dev

A small development team writing the best code to power your digital experiences. With numerous CS-Cart e-store builds, upgrades, and integrations under our belt, we aim to offer the best service at the most competitive price!

Solutions from this developer
View vendor profile

1.8.2 April 2026

  • [fixed] Prevent warning/error when changing from 'N' (incomplete) to Avatax state 'uncommitted'

1.8.2 April 2026

  • [added] Support for tax sub-type

  • [fixed] Prevent warning/error when changing from 'N' (incomplete) to Avatax state 'uncommitted'

1.8.1 April 2026

  • [added] Support for tax sub-type

1.8.0 April 2026

  • [added] Tax code override for digital downloads

  • [added] Tax code field to promotions

  • [added] Notification when package source address incomplete

  • [fixed] Destination address bug

1.8.0 April 2026

  • Fixed up address validation trigger
  • Fixed support for tax settings per profile (if multiple profiles / shipping addresses)
  • Added ability to override tax code for digital downloads
  • Added tax code field to promotions
  • Added notification when package source address incomplete
  • Fixed destination address bug

1.7.1 April 2026

  • [fixed] Address validation trigger

  • [fixed] Support for tax settings per profile (if multiple profiles / shipping addresses)

1.7.0 April 2026

  • [changed] Tidied settings

  • [added] Tax code button

  • [fixed] Submission of product code / UPC code

  • [fixed] Address validation

  • [changed] Tidied logging

  • [added] Advanced (request) logging

1.6.7 February 2026

* Fixed bug causing editing shipping / gift certificate statuses to crash
* Improved warning message when changing to Avatax status "uncommitted" from unknown status

1.6.7 February 2026

  • [fixed] Logic in RMA order re-calculation when tax was previously not removed

  • [fixed] Bug causing editing shipping / gift certificate statuses to crash

  • [fixed] Warning message improved when changing to Avatax status "uncommitted" from unknown status

1.6.6 February 2026

  • Fixed logic in RMA order re-calculation when tax was previously not removed

1.6.6 February 2026

* Fixed logic in RMA order re-calculation when tax was previously not removed
* Fixed bug introduced with new gift certificate logic

1.6.5 February 2026

Fixed bug introduced with new gift certificate logic

1.6.5 February 2026

  • Improved gift certificate support
  • Fixed RMA when not using product_code or no status is known

1.6.4 February 2026

  • Improved gift certificate support

  • Fixed RMA when a product is not using product code, or no RMA status is known

1.6.3 February 2026

  • Added option to only allow profile tax data to be edited by admins

1.6.2 January 2026

  • Added support for tax code in multiple levels of category hierarchy

1.6.6 February 2026

  • Fixed bug when no product code or UPC set and products share name prefix

  • Tidied logic when using UPC

  • Added support for tax code in multiple levels of category hierarchy

  • Added option to only allow profile tax data to be edited by admins

  • Improved gift certificate support 

  • Fixed RMA when not using product_code or no status is known

  • Fixed bug introduced with new gift certificate logic

  • Fixed logic in RMA order re-calculation when tax was previously not removed

1.6.1 December 2025

  • Fixed bug when no product code or UPC set and products share name prefix
  • Tidied logic when using UPC

1.6.0 December 2025

  • Fixed tax rate % bug when multiple items are in cart

  • Removed previously-deprecated option to group taxes into single line item

1.5.3 December 2025

  • Fixed order-level discount bug
  • Added support for "unit price" tax calculation mode

1.5.2 December 2025

  • Added 'chosen_shippings' array key check

1.5.1 December 2025

  • Added support for store pickup (uses store location as both 'from' and 'to' addresses)

  • Updated to latest Avatax PHP SDK

  • Better handling of Avatax error structure when handling/showing errors

1.4.3 November 2024

Fixed order status to Avatax status typo "Comitted" -> "Committed"

1.4.0 October 2024

  • Setting "Group taxes into single line item" is now deprecated - it is now recommended to handle this on the frontend (.tpl files). Sample code is available on request.
  • New setting "Hide $0 taxes" added. This will mean only taxes from Avatax with a non-zero amount will be shown/saved in CS-Cart.
  • Adding/editing orders from the CS-Cart admin interface is now supported

1.3.0 October 2024

This updated version includes better error handling, and new settings allowing "Display notifications as warnings instead of errors" and "Hide jurisdiction name". Jurisdiction name is now displayed by default to prevent confusion, as there can be numerous taxes with the same name but different jurisdiction.

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