The form is filled out as soon as TurboTax sees that you have an underpayment. Then after you say no, you will be asked a few more questions to determine if you meet any of the exceptions to the penalty. such as qualifying for 100% tax forgiveness in the prior year.
If you select yes, that you want PA to calculate the penalty for you, then you will see your PA amount due decrease.
If you look at line 16 of the 1630 you will see the amount of interest, which is also included on line 27 of your PA-40.
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