The tax calculator comes handy in calculating the GST, PST or QST for any amount in any of the province. The calculation can be done based on the data provided by the CRA or Revenue Quebec. Once you have the result or the calculations, they can be applied to other provinces by comparing the results.
Note: For Quebec, as of January 1, 2013, the QST will be calculated on the selling price excluding GST, but to compensate it will be increased to 9.975%, which makes no difference for the tax payer since the total will be the same amount. For Prince Edward Island, the calculation will stay the same as 2012 until April 2013.