Tax brackets determine how much tax you owe based on your income. They are regularly adjusted for inflation, or the increase in the cost of goods and services. This year the brackets have shifted. That's good news for married couples filing jointly with a combined 2016 income of up to $75,300: They've have moved into the 15 percent tax bracket, down from the 25 percent bracket in 2015. To see the adjusted 2016 brackets, go to the IRS website, or here to see how the brackets changed between 2015 and 2016.

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Porsche AG CEO Matthias Mueller steers the new Porsche 918 Spyder during a preview by the Volkswagen Group prior to the 65th Frankfurt Auto Show in Frankfurt, Germany, Monday.