Given only the information you entered so far, you did not pay enough estimated taxes for your business income or did not have enough withholding taken out during the year by your employer. Did you pay any estimated taxes for your business income? Don't worry about the penalty section until you have everything entered as the amount will likely change as you add information. If you did make estimated payments and need to enter them, see this TurboTax FAQ
It is dependent on your income and timing of your tax payments/withholdings. The IRS levies underpayment penalties if you don't withhold or pay enough tax on income received during each quarter. Even if you paid your tax bill in full by the April deadline or are getting a refund, you may still get an underpayment penalty.
Example from this TurboTax FAQ: Taylor is self-employed and estimated next year's tax bill at $20,000. Rather than making 4 quarterly payments of $5,000 each, they chose to pay $500 in each of the first 3 quarters, and the remaining $18,500 in the fourth quarter. When they filed, their actual tax bill came to $17,270 and they got a $2,730 refund. However, Taylor got hit with the underpayment penalty, because they underpaid their estimated tax in the first 3 quarters. More on Underpayment Penalties; Topic 306.
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