what counts as nii 
the following table shows what counts and what doesn t count as net investment income 3who pays the nii tax net investment income is subject to a 3 8 tax if you exceed certain income limits the tax applies to individuals estates and trusts 3the tax is applied to individuals with nii who fall within a certain modified adjusted gross income threshold 3 these thresholds are listed in the table below and they are not indexed for inflation the net investment income tax is applied to the lesser of the net investment income or the magi amount in excess of the predetermined limit estates and trusts are subject to the nii tax if they have undistributed nii and their annual adjusted gross income agi exceeds the dollar amount at which the highest tax bracket begins 3 that level is 14 450 in 2023 and 15 200 in 2024 45a nonresident alien is not subject to the tax unless they are married to a u s citizen or resident and elect to be treated as a resident of the u s for tax purposes 3for investment companies net investment income is the amount of income left after operating expenses are subtracted from total investment income and is typically expressed on a per share basis 6to find the net investment income per share of a company divide the total investment income by the shares outstanding this amount is what is available to shareholders as dividends a publicly traded company must list its net investment income on its balance sheet 