October 15, 2019 is the last day to e-file a 2018 tax return with an extension to avoid a failure to file penalty of taxes are owed.
If the 2018 tax return is being filed for a tax return or no taxes are owed then there are no penalties for filing the 2018 tax return after the due date.
Using TurboTax the online editions will be shutting down after 10/15/19. After that date the 2018 tax return can only be printed and mailed.
