Kaci, a single filer, has received $$110,000$ from wages and $$100,000$ from net investment income. Her MAGI is $$210,000.$ She is subject to the net investment income tax $($NIIT$).$ Since Kaci's income exceeds the $$200,000$ threshold amount for single taxpayers by $$10,000,$ the NIIT equals: Kaci, a single filer, has received $$110,000$ from wages and $$100,000$ from net investment income. Her MAGI is $$210,000.$ She is subject to the net investment income tax $($NIIT$).$ Since Kaci's income exceeds the $$200,000$ threshold amount for single taxpayers by $$10,000,$ the NIIT equals: