It depends.
Your tax liability is factored based upon different types of income which might have differing tax rates. For example, long-term capital gains are taxed at a different rate than your ordinary income. If you have self-employed business income, you may also have self-employment taxes included in the overall tax liability calculation.
Please see this links for steps to preview your tax return to help you determine what income is being reported on your return to help you narrow down why the tax being calculated is higher.
How do I preview my return in TurboTax Desktop software?
How do I preview my TurboTax Online return before filing?