Investment income (mostly dividends and capital gains taxed at a rate of 15% , and interest), is 60% of the income of the wealthiest taxpayers, according to IRS data for 2009. Business income is about 20%. Salaries and wages are about 20%. Other sources of income are insignificant for the wealthiest as a group.
Salaries and wages, taxed at rates up to 33%, are over half the income of people with incomes less than $500,000 per year. Other important sources for these taxpayers are Social Security, pensions and annuities, and business income.