The underpayment penalties for Federal and state are an estimated amount. It is common and expected for the IRS or state to recalculate it and send you a refund or a bill for more. You can select to leave it off and let the IRS or state to calculate any penalty. It can't calculate it accurately, like Turbo Tax doesn't know when they will get your tax due payment among other things.
And you might be able to eliminate it or at least reduce it by annualizing your income and payments. You can go to Federal Taxes tab or Personal tab, under Other Tax Situations and select Start by the Underpayment Penalties. You will answer a series of questions that may reduce or eliminate the penalty. It's form 2210 for federal. State should have a similar section.
