For 2017 returns. The final efile deadline is Monday Oct. 15, 2018 at 11:59pm your time zone.
After today you will have to print and mail it. You might have to switch to the Desktop program to continue and finish. If you are getting a refund there is no penalty for filing late. You have 3 years to file for a refund. If you have a tax due the payment was actually due on April 18. So you will get a bill from the IRS for any interest depending on when they get your payment.
If your efile rejects you have until Oct 20 to fix it and refile or print and mail it.
If you don’t e-file by 11:59pm tonight you will not be able to do so after today. If the return is complete, you will be able to print the return to mail it by going to My Tax Home, or My Docs.
