As they often are, income tax benchmarks have been adjusted for inflation. For example, married couples filing jointly with a 2014 household income of under $18,150 will qualify for a 10 percent tax rate when they file their 2014 returns. For the 2015 tax year, the tax bracket will rise to $18,450. For the full table, see page 5 of the IRS’ revenue procedure document.

Ann Hermes/The Christian Science Monitor/File
Examples of 'Understanding Taxes' graphic design posters hang in the halls of the US Internal Revenue Service building in Washington.