Hey, I'm not saying it's impossible to spend $12,500 CAD. It is very possible, but I just want to say that I believe that many people underestimate their spending.
Any estimate of what someone thinks they spend that I have seen is often very wrong. To get a reasonably accurate representation of spending, I think that you need some detailed long term data and to create averages from that. This can be done either from tracking all expenses, or by taking after tax earnings and subtracting off savings and tracking the average of the remainder.
Just making an estimate based on what you think you spend in each category isn't accurate enough in my opinion. So always track the real numbers. Anyway, I'm not saying you're doing it wrong because I don't know how your calculated it, just that this is worth mentioning because I see it a lot.