This is quite common. As you make more money, you have more taxable income which means you have a greater tax liability. Also, as your income increases, you can lose tax credits such as the Earned Income Credit (EIC) which operates on a bell curve - meaning you need a minimum amount of earned income to qualify but then after a certain point, additional income decreases your credit. Review the TurboTax FAQ on this subject below.
If, after review the material below, you are still unsure then the best course of action for you to take is to print out this years return and get a copy of last year’s return and compare the two side by side, line by line. The reason for the difference should become fairly clear if you compare the returns. After you have a better idea of what is causing the unexpected result, then you can post a followup question with specifics.
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