For 2022 , Christina, a single taxpayer, reports modified adjusted gross income of $375,000 which includes net investment income of $90,000. What is the additional tax on unearned income for the year? $0 $3,420$14,250$6,650 For 2022 , Christina, a single taxpayer, reports modified adjusted gross income of $375,000 which includes net investment income of $90,000. What is the additional tax on unearned income for the year? $0 $3,420$14,250$6,650