You should be able to fill it out in the interview steps. Also you can go into Forms and check a box to not include it and let the IRS calculate it.
If Turbo Tax doesn't automatically fill it out you can add it yourself. 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. Or you can elect to have the IRS figure the penalty for you. It's form 2210.
It's under
Federal or Personal (for Home & Business Desktop)
Other Tax Situations
Additional Tax Payments
Underpayment Penalties - Click the Start or update button
