You have to manually enter any estimates you paid. So if you don't enter any then Turbo Tax would assume you didn't pay any estimates during the year. Then if you end up owing too much on your tax return Turbo Tax will automatically add an underpayment penalty.
And if Turbo Tax calculates a penalty on your 2019 return 1040 line 24 it is only an estimate. Turbo Tax can not figure it accurately because they don't know exactly when the IRS or state will get your return and tax due payment. It's very common and normal and expected for the IRS or state to bill you for more or send you a refund.
