Taxes owed on the 2023 return had to be paid on or before April 15, 2024 to avoid a failure to pay penalty. Filing the extension only gave you until October 15, 2024 to file the actual tax return. It was not an extension for the payment of taxes owed.
TurboTax cannot calculate late payment penalties and interest since it has no way to know if and when you paid the taxes owed. Only the tax authority, IRS or State, can calculate the penalties and interest after receiving the taxes owed.
