Dawg House, a C corporation, has decided to make an S election beginning January 1, 2020. At the date of the election, Dawg House had the following assets and liabilities: AB FMV Cash $20,000 $20,000 Accounts Rec -0- 40,000 Land 30,000 60,000 Other assets 60,000 90,000 Accounts payable -0- 25,000 During 2020, Dawg House collected $35,000 of the accounts receivable and paid $10,000 of the accounts payable. The taxable income (computed as if a C corporation) for the year is $75,000. What is the amount of built-in gain tax liability?