It's true that the vast majority of the 69 million households make less than $50,000 -- with very heavy representation among households making less than $30,000.
But nearly 5 million households in the group make somewhere between $50,000 and more than $1 million. The vast majority of that group -- 4.3 million -- make between $50,000 and $100,000. Another 485,000 make between $100,000 and $500,000. And the remaining 18,000 make $500,000 or more
Very high-income households can fall into the non-payer group if they get their income from tax-exempt bonds or overseas sources for which they get foreign tax credits, according to Roberton Williams, a senior fellow at the Tax Policy Center.
Other data from the IRS show that the tax bite on the very highest income taxpayers has fallen as their incomes have risen. In 2007, the top 400 individual tax returns had an average adjusted gross income of $345 million, up from $47 million in 1992. But their average tax rate was just 17%, down from 26% in 1992.