Answer: $14,000 (Unfavorable)
Explanation: The book tax difference is the difference between the expenses for the book purpose in 2019 and the price of the option exercised. If the difference is positive it is unfavorable while if the difference is negative it is favorable.
Difference in book tax = The total value of the shares at the year - Amount of bargain element on option exercised.
Difference in book tax = ($40,000 × 1/2) - (1,000 × $6)
Difference in book tax = $20,000 - $6,000
Difference in book tax = $14,000
It is unfavorable because book tax expenses exceed the tax deductions.