President Barack Obama on Monday called on Congress to pass a temporary, one-year extension of the Bush-era tax cuts for people who make less than $250,000 a year. (Susan Walsh/AP)

Americans paid the lowest tax rates in 30 years to the federal government in 2009, in part because of tax cuts President Obama sought to combat the Great Recession, congressional budget analysts said Tuesday.

A sharp decline in income — especially among the wealthiest Americans, who pay the highest tax rates — also played a role, according to the report by the nonpartisan Congressional Budget Office. Household income fell 12 percent on average from 2007 to 2009, with income among the top 1 percent of earners decreasing by more than a third.

Still, at the very moment anti-tax protesters were emerging as the most powerful force in American politics, handing Republicans landslide control of the U.S. House, the data show that people were sending the smallest portion of their income to the federal government since 1979.

During Obama’s first year in office, the average tax rate paid by all households fell to 17.4 percent, down from 19.9 percent in 2007, according to the CBO. The 2009 rate was significantly lower than the previous low of 19.4 percent in 2003 and well below the 30-year average of 21 percent.

The tax burden — which includes all forms of federal levies, including income, payroll and corporate taxes — lightened for households across the board, the result in part of Obama’s signature “Making Work Pay” tax credit and other tax cuts passed as part of the 2009 economic stimulus package, the CBO said.

Average federal tax rates (The Washington Post/Source: Congressional Budget Office)

The lowest fifth of earners benefited the most, sending just 1 percent of their before-tax income to the federal government in 2009, compared with 5.1 percent in 2007. The top fifth of earners paid 23.2 percent, compared with 24.7 percent in 2007.

The average federal income tax rate also reached a new low, settling at 7.2 percent in 2009 — two points lower than in 2007, the CBO said. Although detailed data are available only through 2009, the CBO said more recent estimates suggest that effective tax rates remained at historically low levels in 2010 and 2011.

“However much Republicans try to perpetuate false claims, the facts speak for themselves: Tax rates have never been lower than under President Obama,” said Rep. Sander M. Levin (Mich.), the senior Democrat on the House Ways and Means Committee, which has jurisdiction over taxes.

Michelle Dimarob, spokeswoman for Ways and Means Chairman Dave Camp (R-Mich.), countered: “Under President Obama and the Democrats who control Washington, Americans have lost their jobs, seen their wages decline and fallen into lower tax brackets. A weak economy and fewer jobs is nothing to cheer about.”

Besides, Republicans said the low rates won’t last long if Obama wins reelection and follows through on his pledge to let the George W. Bush-era tax cuts expire for the roughly 2 percent of households that make more than $250,000 a year, a group that includes many business owners and investors.

Obama reiterated that pledge Monday, urging lawmakers to act now to extend the cuts through 2013 for the vast majority of households. The cuts, enacted in 2001 and 2003, are scheduled to expire in January.

“Despite yet another disappointing jobs report on Friday, he doubled down on that tax hike,” said Michael Steel, a spokesman for House Speaker John A. Boehner (R-Ohio).

White House spokeswoman Amy Brundage took credit for the low tax rates while acknowledging the recession’s broader toll.

“While the President has fought since day one to cut taxes for the middle class by a total of $3,600 a year, Americans are still fighting to make ends meet,” she said by e-mail. “That’s why the President won’t rest until Congress acts to extend the tax rates for the middle class.”