A late payment penalty has nothing to do with when you *FILE* your taxes. It has everything to do with when you *PAY* your taxes and the date the IRS credits that payment.
Now if you filed your 2019 taxes late (which would be after July 15th, 2020) and paid the IRS after that date, then a late penalty is due. The best the TurboTax program can do is *ESTIMATE* the payment based on your actual filing date, if you actually filed after July 15th. But like I said, the actual amount of any late payment penalties and/or interest is bsaed on the tax payment date; not the filing date. Therefore once the IRS receives payment, it is customary for them to bill you separately via USPS for any additional interest and/or late payment or late filing fees that may be due. Pay them in a timely manner (by the deadline shown on the letter) and you're done. Otherwise, your nightmare has just begun.
