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For individuals, the tax will be reported on, and paid with Form 8960 and on Form 1040.
For Estates and Trusts, the tax will be reported on, and paid with, the Form 1041.

In order to arrive at Net Investment Income, Gross Investment Income is reduced by deductions that are properly allocable to items of Gross Investment Income.
Examples of properly allocable deductions include investment interest expense, investment advisory and brokerage fees, expenses related to rental and royalty income, and state and local income taxes properly allocable to items included in Net Investment Income.

All RRTA compensation that is currently subject to Medicare Tax is subject to Additional Medicare Tax if it is paid in excess of the applicable threshold for an individual’s filing status.

All wages that are currently subject to Medicare Tax are subject to Additional Medicare Tax if they are paid in excess of the applicable threshold for an individual’s filing status.

Individuals will owe the tax if they have Net Investment Income and also have modified adjusted gross income over the following thresholds:
Married Filing Jointly $250,000
Single, Head of Household or Qualifying Widower $200,000
Married Filing Separately $125,000

Additional Medicare Tax applies to wages and compensation above a threshold amount received after December 31, 2012 and to self-employment income above a threshold amount received in taxable years beginning after December 31, 2012.

Individuals will owe the tax if they have Net Investment Income and also have modified adjusted gross income over the following thresholds:
Married Filing jointly & Qualifying widow(er) $250,000
Single or Head of Household $200,000
Married filing separately $125,000

The Net Investment Income Tax went into effect on Jan. 1, 2013. The NIIT affects income tax returns of individuals, estates and trusts for their first tax year beginning on (or after) Jan. 1, 2013.
It does not affect income tax returns for the 2012 taxable year filed in 2013.

The Net Investment Income Tax went into effect on Jan. 1, 2013. The NIIT affects income tax returns of individuals, estates and trusts for their first tax year beginning on (or after) Jan. 1, 2013. It does not affect income tax returns for the 2012 taxable year filed in 2013.

The Net Investment Income Tax is imposed by section 1411 of the Internal Revenue Code (IRC). The NIIT applies at a rate of 3.8 percent to certain net investment income of individuals, estates and trusts that have income above the statutory threshold amounts.