In addition to following the suggestions provided by @DoninGA, check to see that you entered your payments, including estimated payments, correctly in TurboTax, along with your deductions and credits. Also, verify that each income item was entered only one time. Sometimes users manually enter an income item that was also imported.
See also this TurboTax help article for additional common explanations as to why a user may owe more tax than expected.
@David-M1x
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