Taxpayer A is an employee of a Canadian private corporation. During 2020, they receive options to purchase 900 shares of their employer's common stock at a price of $15 per share. At this time, the estimated per share value of the stock is $9.75. During 2021, they exercise all of these options. At this time, the estimated market value of the stock is $22 per share. On December 1, 2022, they sell the stock for $29 per share.

Required: Calculate the impact (if any) of the 2020, 2021 and 2022 transactions on their income for tax purposes.