WASHINGTON -- Here's a dirty little secret that most Americans don't want to hear: We're under-taxed.
That may sound like heresy; nobody wants to pay more taxes. But by historical standards, what we pay in federal taxes -- rich, poor and everyone in between -- has gone down.
At a time when Washington is wrestling with how to end federal budget deficits and trim the national debt -- huge questions that are expected to dominate the nation's politics through the 2012 elections -- the fact that Americans are under-taxed compared with U.S. historical norms is central to the discussion.
This fact is separate from the politically charged questions of whether government spends too much, the fairness of who pays how much and what we value or don't in government spending. It's simply that our tax burden is low in the long view of U.S. history, and there are many ways to measure that central truth.
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One way is to look at the trend of total federal revenues, 81 percent of which come from income and payroll taxes, 9 percent from corporate taxes, 3.5 percent from excise taxes and 6.5 percent from other sources, according to the Office of Management and Budget.
The post-World War II historical average is that federal revenues equal about 18 percent of the U.S. gross domestic product, the broadest measure of annual economic production. In the year 2000, after the longest economic expansion in U.S. history, federal revenues equaled almost 21 percent of the economy. As a result, Washington cut taxes in 2001 and 2003.
Revenues plunged to around 15 percent of the economy in 2009 and 2010 amid the deep financial crisis, and dipped even further this year, to 14.4 percent, the lowest level since 1950.
Meanwhile, federal spending soared this year to 25.3 percent of the GDP, the highest since 1945, the last year of World War II.
The difference between spending and revenue yielded the federal budget deficit: $1.6 trillion this year, the highest ever.
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Americans across all income classes paid lower effective tax rates in 2007, the last year of complete Internal Revenue Service data, than they did in 2000. The effective tax rate is what people pay after all exemptions and deductions. This is according to the most recent comprehensive look at taxes by the nonpartisan Congressional Budget Office.
The highest 20 percent of tax filers saw their total average federal effective tax rate fall from 28 percent in 2000 to 25.1 percent in 2007, according to the CBO. That's considerably lower than the current top marginal tax rate of 35 percent, and lower than the 27.5 percent effective rate in 1979, the first year that CBO data are available.
For the wealthiest 1 percent of filers, the effective tax rate fell from 33 percent in 2000 to 29.5 percent in 2007.
The poorest 20 percent of filers saw their effective rate fall from 6.4 percent to 4 percent.
That's not to say the wealthy don't pay taxes -- the top 1 percent paid 39.5 percent of all U.S. income taxes in 2007 -- but taxes take a smaller share of their wealth today than historical post-World War II norms.
"They've been coming down for everybody, but we're taking more income at the top. Even if their rates are lower than they used to be, you are applying those lower rates to much larger income," said Roberton Williams, a senior fellow at the nonpartisan Tax Policy Center who spent 22 years as a CBO tax and income analyst.