...and if you cannot get it e-filed before 15 October, then make sure you download your ".tax2018" datafile from your Online account. That tax file is what contains all the information you have entered so far, and will be needed to continue working on your 2018 tax file using the desktop software. (A PDF is useless for continuing to work on it. It must be the datafile). You should probably download the datafile even if you do get it e-filed by the deadline, just in case you do have to followup with some error, or later have to amend the tax file with the desktop software at a later date.
AND Get that file downloaded to your home computer before 25 October. Sometime in the days/ few weeks following 25 October (unknown exactly when), the Online software will lock you out of accessing anything in that Online account for a few weeks. Generally they will open it back up for access in late Nov or mid-late December, but you can't even get your ".tax2018" datafile during that lockdown period.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
