After you file

It's not a matter of turbotax having no way of knowing how I want to calculate the penalty.  It's that it seems to me that turbotax would have picked up on the fact that I was in a potential penalty situation at all, especially given that I also used turbotax for the previous tax year such that it would have had the data necessary to determine if I'd paid in 100% of the tax liability from the previous tax year. I don't have a problem with having to pay the penalty. It just seems very odd that turbotax would not have picked up on the fact that I was in a penalty situation and prompted me accordingly, so that I could have simply paid the penalty when I filed. Doesn't that seem odd to you too?