Did the IRS bill you for an under payment or late payment penalty ?
If so TT only calculates an estimated underpayment penalty based on the information you entered (unless you choose to override that function) and the IRS/state will then bill you for any more they determine is needed based on the info they have and when you actually pay the balance due. The program cannot estimate the late payment penalty ... the IRS/state always bill you for that themselves.
