determine the dollar amount of the book - tax difference ( if any ) written as a positive number 2015 On January 1 , 1998Landmark Corporation offered its CFO 2.000 NQOs options to purchase the company's at the same price offered by the public market on that day , S15 / share , at any date in the future after the CFO vests . The CFO will vest 25 % of its options in 1998 , 25 % in 1999 , and vest the remaining portion in 2017. The CFO promptly exercised all of his options on December 31 when he was 100 % vested and turned around and sold all the shares for the public market Assume that on the grant date , Landmark Corporation estimated the value of the options would be S10 / share . The company uses a calendar year tax period. what is the book-tax difference in 1998?