Imperial Construction Incorporated (IC) issued 100,000 incentive stock options (ISOs) to its employees on January 1, 2020, with an estimated value of $5.50 per option. The options vest (accrue) at 25 percent per year for four years (beginning in 2021). Each option allows the holder to purchase one share of stock at $8. On January 1, 2022, employees exercised 12,500 options as IC's stock price reached $14.72. What is the amount of the booktax difference in 2022 associated with the incentive stock options? Is it favorable or unfavorable? Is it temporary or permanent?