(Bloomberg) Some $1.4 trillion in individual income taxes are due to the IRS on April 15. But for many Americans, that’s only the half of it. A new report from the U.S. Congress’s Joint Committee on Taxation shows that looking only at income taxes misses most of what we pay to the federal government each year.

The average American pays an income tax rate of 10.1 percent, the Joint Committee shows, although that varies quite a bit depending on income.

That may seem low, particularly since the official income tax rates start at 10 percent and go all the way to 39.6 percent. The Joint Committee is also accounting for lots of income that never gets taxed, such as Medicare and Social Security benefits, employer-paid insurance, and the employer portion of payroll taxes. Also, taxpayers pay the highest rates, above 28 percent, only on earned income above $200,000 or so. The IRS takes far less from the first $200,000 earned, especially after deductions, and from investment income. Finally, many poor Americans pay zero taxes and even get money back: About 32 million people benefit from that Earned Income Tax Credit.

Just looking at income taxes can be misleading, however. All salaried workers also pay a 7.65 percent payroll tax to cover Social Security and Medicare, and higher earners owe another Medicare tax. Their employers also must pay the same amount in payroll taxes for each worker. The government collected $1 trillion from payroll taxes last year.

Wealthy Americans end up paying taxes at a lower rate than poor and middle-class Americans, because the government collects Social Security tax only on annual wages up to $118,500.

The tax burden rises progressively with income, with the wealthiest paying a third of their income to the federal government. One exception to the tax rate's steady rise through the income brackets: Americans who earn less than $10,000 per year, who don’t get enough from the EITC at tax time to make up for the payroll and excise taxes they pay all year.

On top of individual income and payroll taxes, the federal government collects $93.4 billion in excise taxes on such things as fuel, cigarettes, alcohol, and plane tickets. The feds take 7.5 percent of every airline fare, plus $4, for example; the gas tax is currently 18.4¢ per gallon.

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