Solved
My return is so simple: only 3 1099-R entries, one interest entry, using standard deduction.
You may have an underpayment penalty. The tax system is a pay as you go system. If you don't have enough withholding from your income, you can get hit with an underpayment penalty . 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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