Configuring taxes for Canada in OpenCart can be a little tricky with GST/HST and PST being different across provinces.
I found some resources which helped me configure Tax Classes, Tax Rates and Geo Zones in OpenCart v220.127.116.11. The screenshots and percentages found on forums dated back to 2010, and since then tax rates have increased/changed and the way OpenCart handles Geo Zones and Taxes also changed.
I took screenshots of my setup to help anyone else who needs to configure their OpenCart store for Canadian Taxes.
*Note: Since screenshots, I have changed the PEI PST the effective rate of 10.5%, just like I’m using 9.975% for QC.
After my implementation, I came across another configuration. I find it less redundant; grouping similar tax rates. This method of configuration requires less tax class entries, although it can be less clear in the years to come, or for a new developer. It can be found here: http://williamkingsblog.blogspot.com/2012/02/opencart-canada-taxes-setting.html