As a rule, you can deduct any reasonable current expense you paid or will have to pay to earn business income. The expenses you can deduct include any GST/HST you incur on these expenses less the amount of any input tax credit claimed.
Since you cannot deduct personal expenses, deduct only the business part of expenses from business income. In addition, you cannot claim expenses you incur to buy capital property.
For more information, see the list of expenses below.
When you claim the GST/HST you paid on your business expenses as an input tax credit, reduce the amounts of the business expenses you show on Form T2125, Statement of Business or Professional Activities, by the amount of the input tax credit. Do this when the GST/HST for which you are claiming the input tax credit was paid or became payable.
Similarly, subtract any other rebate, grant, or assistance from the expense to which it applies. Enter the net figure on the proper line. Any such assistance you claim for the purchase of depreciable property used in your business will affect your claim for capital cost allowance (CCA) .
If you cannot apply the rebate, grant, or assistance you received to reduce a particular expense, or to reduce an asset's capital cost, include the total on line 8230 - Other income in Part 3 of Form T2125.