If your 2017 return is in rejected status, you can sign in and resubmit your return through Saturday, October 20.
You can also file a conventional paper return through October 20 by signing in, reopening your return, selecting File, and following the onscreen instructions to file by mail.
After October 20, TurboTax Online is no longer available to prepare, finish, or file 2017 returns. Unfinished 2017 returns can be transferred to the TurboTax CD/download software to be paper-filed.
TurboTax CD/Download software
If your 2017 return is in rejected status, you can electronically resubmit your return through Saturday, October 20. Otherwise, you can always mail a paper return by choosing the File by mail option.