Filed extension, what would I owe being late

TurboTax will not calculate the late payment penalty/interest nor should you.  Pay the amount your tax return says that you owe.  The IRS will calculate any additional amount based on the amount you owe and when they receive your payment, and then they will bill you separately for that amount.

Did IRS calculate your delate payment penalty and interest

@binbin Before you posted in this thread, did you not read anything it said in the thread?  Look at the reply directly above your own post,