It is very hard to explain the reason for this amount of tax due without actually looking at your return and your tax forms (W-2s, 1099-R, etc...).
One reason would be the tax (and eventually the early withdrawal penalty) on your retirement plan distribution if no tax was withheld.
If you are using TurboTax Online, you add TurboTax Live to have a tax professional review your return before filing.
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