Which income item is NOT included in net investment income when calculating the net investment income tax?

Net investment income tax applies to certain types of income, primarily from investments, such as interest, dividends, capital gains, and rental and royalty income. Nonemployee compensation, such as payment for freelance or contracted work, is considered ordinary earned income rather than investment income. Therefore, it is excluded from the calculation of net investment income.

Assets like interest and dividends, capital gains, and income from rental and royalties directly relate to investment activities. Conversely, nonemployee compensation derives from providing services, distinguishing it from the other categories of income that contribute to net investment income. This clarity on types of income helps in assessing tax liabilities correctly under the net investment income tax framework.