whoscloset- rest assured we have a very qualified accountant, in fact more than one.
The problem arises when rooms may serve as double duty.
Square footage is only part of the equation.
And, I have seen auditors actually get out their measuring tapes to assess the square footage of an area. I think you'll find, that unless you have a very small residence- using ONE bedroom and HALF a basement, to claim 1/3 of ALL your household expenses is likely a bit excessive.
Do you consider yourself to be a salaried employee of your business, or a commissioned employee? Is your business a Limited Company?
http://www.cra-arc.gc.ca/tx/ndvdls/tpcs/ncm-tx/rtrn/cmpltng/ddctns/lns206-236/229/slry/wrkspc-eng.html
http://www.cra-arc.gc.ca/tx/ndvdls/tpcs/ncm-tx/rtrn/cmpltng/ddctns/lns206-236/229/cmmssn/hm-eng.html
For either: for 2007 "You can deduct the part of your costs that relates to your workspace, such as the cost of electricity, heating, and maintenance. However, you cannot deduct property taxes, home insurance, mortgage interest or capital cost allowance."
Then again, another issue always arise in that you must be permitted to actually operate a business in your residence- not all municipalities permit this. So, if you can't legally operate a business under your residential zoning rules- how can you get a deduction?
whoscloset- It's the ALL in your definition that sets off the red flag, nothing more.
Not "ALL HOUSEHOLD EXPENSES" can be so prorated, and deducted- as you would have us believe.