Gabriel, age 40, and Emma, age 33. are married with two dependents. They recorded AGI of $250,000 in 2018 that included net investment income of $3,000 and gambling winnings of $2,500.
The couple incurred the following expenses during the year (all of which resulted in itemized deductions for regular income tax purposes).
Medical expenses (before 7.5%-of-AGI floor)  ............................................................................. $12,000
State income taxes ..........................................................................................................................     5,800
Real estate tax ..................................................................................................................................     9,100
Interest on personal residence ......................................................................................................   18,600
Interest on home equity loan (proceeds were used to remodel the couple's kitchen) ..........     9,800
Investment interest expense .........................................................................................................      4,500
Charitable contribution (cash) .......................................................................................................   14,200
a. What is Gabriel and Emma's AMT adjustment for itemized deductions in 2018? Is it positive or negative?
b. Gabriel and Emma also earned interest of $5,000 on private activity bonds that were issued in 2014. They borrowed money to buy these bonds and paid interest of $3,900 on the Joan. Determine the effect on AMTI.