That can be caused by not paying in the required amount of tax on quarterly basis. In general, you are required to pay in 100% of your previous year tax liability or 90% of your current year liability on a quarterly basis, or face a penalty for late payment of tax.
If your income was sporadic during the year, you may be able to reduce the penalty by using the Underpayment penalties routine in TurboTax you will find under Additional tax payments in the Other Tax Situations section.
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