Income received from investment assets, such as stocks, bonds, mutual funds and loans, minus related expenses.
For insurance companies, net investment income represents the amount of income left after operating expenses are subtracted from total investment income.
Net investment income is typically expressed on a per share basis and is calculated pre-tax. To figure the per share net investment income of a company, divide the net investment income by the shares outstanding. This results in the amount available to shareholders in the form of dividends.