I have trouble understanding the rationale behind why certain things are tax deductible while other things are not. For example, I understand that RRSP contributions are tax deductible because I am not 'using' the money in my RRSP account, yet — it is for retirement.
But, why are the interest + taxes on my mortgage tax deductible? I cannot find any logic. By this token, any tax I pay on any services should be tax deductible.