Every month, my girlfriend and I pay out $100 for protein supplements. I will likely purchase them annually because they are the most cost-effective protein source. I would save around $150 annually if there were no HST. You can figure out your value-added tax and GST with the online Ontario tax calculator. In order to create a monthly budget that is easy to share with my friends, I downloaded the PDF file. Canadians are the target audience for the Ontario tax calculator.