net investment income taxes

[tiffo]

I sold a rental property for which I am paying capital gains taxes on the sale.  However, I am also being assessed additional net investment income taxes on part of my profits from the sale.  Is this correct?  Isn't this double taxation on the same transaction? 

[Bsch4477]

The net investment income tax (NIIT) is a 3.8% tax that kicks in if you have investment income and your income exceeds $200,000 for single filers, $250,000 for those married filing jointly or $125,000 for those married filing separately

[rjs]

Net Investment Income Tax (NIIT) is additional income tax on investment income when your AGI is over a certain threshold that depends on your filing status. In effect it's a higher tax rate on investment income of high-income taxpayers. It is not double taxation.