The amount you can deduct for business use of home expenses cannot be more than your net income from the business before you deduct these expenses. In other words, you cannot use these expenses to increase or create a business loss. However, the amount you cannot deduct this year because of this restriction can be carried forward to next year. For more info, please see http://www.cra-arc.gc.ca/tx/bsnss/tpcs/slprtnr/rprtng/t2125/ln9945-eng.html
