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Magento Canadian GST Fix
Listing GST and provincial taxes seperately and not compounded, in the Magento eCommerce system is possible with two "fixed" files, available free to download here.

You'll need two files all together and installation instructions are listed below. This has been tested on a limited basis with an online shop located in Ontario and collecting GST from all provinces and PST from Ontario only.

As will most things there are no guarantees. Should you find a bug related to these tax calculations please contact us using the online "Contact Us" form.

Installation

  • Ensure you have a complete backup of you website files.
  • Download one of these files and unzip;
    canada_gst_fix_1324.zip Magento ver 1.3.2.4
    canada_gst_fix_1401.zip Magento ver 1.4.0.1
  • Copy the Calculation.php core tax calculation file to the app/code/core/Mage/Tax/Model/Mysql4/ folder of your Magento installation and overwrite the existing file.
  • Copy the Form.php admin tax rule form file to the app/code/core/Mage/Adminhtml/Block/Tax/Rule/Edit/ folder of your Magento installation and overwrite the existing file..
  • Then set up your seperate GST and PST Tax Rates and Rules, being sure to set the Priority of each rule differently.
  • Priority 1: GST (5%) and all three HSTs (13%) for New Brunswick, Nova Scotia and Newfoundland 
  • Priority 2: Quebec (7.5%) and PEI (10%) 
  • Priority 3: Ontario (8%), Manitoba(7%), Saskatchewan (5%) and British Columbia (7%)
  • Set the "Display full tax summary" to Yes in the System->Configuration.

You should now be finished.