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Wages, unemployment compensation; operating income from a nonpassive business, Social Security Benefits, alimony, tax-exempt interest, self-employment income and distributions from certain Qualified Plans.

To the extent that gains are not otherwise offset by capital losses, the following gains are common examples of items taken into account in computing Net Investment Income:
1.Gains from the sale of stocks, bonds, and mutual funds.
2.Capital gain distributions from mutual funds.
3.Gain from the sale of investment real estate (including gain from the sale of a second home that is not a primary residence).
Gains from the sale of interests in partnerships and S corporations (to the extent you were a passive owner).

The Net Investment Income Tax will not apply to any amount of gain that is excluded from gross income for regular income tax purposes.
The pre-existing statutory exclusion in IRC section 121 exempts the first $250,000 ($500,000 in the case of a married couple) of gain recognized on the sale of a principal residence from gross income for regular income tax purposes and, thus, from the NIIT.

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.

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.

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.

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

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.

No, but you may request that additional income tax be withheld from your wages.