As thousands of anti-tax protesters rallied across the nation yesterday and the president promised tax cuts for most, new data showed that the federal income tax burden is already hovering near its lowest level in three decades for all but the wealthiest Americans.

The nonpartisan Congressional Budget Office estimates that the average family forked over barely 9 percent of its earnings to the IRS in 2006, the most recent year for which information is available. The effective tax rate hit its all-time low in 2003 and has since crept up only slightly.

Middle-class families -- to whom President Obama has delivered even more tax relief since he took office in January -- have fared especially well, according to the CBO. The middle fifth of taxpayers, who earned an average of $60,700 per household in 2006, paid just 3 percent in federal income tax that year, down from a high of 8.3 percent in 1981.

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