In 2017 I had interest income as well as rental property income. I also received a Social Security back pay lump sum payment, which I had to repay in the same year to my employer disability firm. Even though I deducted this repayment, the back pay income still caused my MAGI to exceed the $200,000 single threshold. Do I still have to pay the 3.8% tax on net investment even though I repaid a good portion of my $200,000 MAGI as a deduction on form 1040 schedule A? Please help!