Outside of Quebec, provincial and federal taxes are withheld as one amount appearing in box 22 of the T4 and claimed on line 43700 on the T1 return. An exercised stock option that is subject to CPP withholding will result in the CPP being included in box 16 of the T4. The related tax credit and deduction are computed either manually on Schedule 8 or automatically if using CRA certified tax preparation software. In the year of sale of the shares, the commissions and fees plus the amount you paid at the time of purchase of the shares, are deducted from the sale proceeds to determine a capital gain or loss.