You can get hit with an underpayment penalty in the situation you described because of the dates that you prepaid your estimated taxes or if you didn't pay 100% of your taxes for the prior year in withholding and estimated tax payments.
Review the IRS topic 306, Penalty for underpayment of estimated tax for additional information. Also, review the TurboTax Help article Why am I getting an underpayment penalty?
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