E-filing for the 2018 tax season is closed by the IRS permanently and forever. The online version of TurboTax 2018 was shut down permanently and forever on Oct 15th, 2019 so that things can be prepared for the 2019 tax season.
To file a 2018 tax return you have to purchase the CD version of the software and physically install it on your computer.Then use it to prepare your 2018 tax return. Once prepared you have to print, sign and mail it to the IRS.
You can purchase a download of the TurboTax CD for 2018 at https://turbotax.intuit.com/personal-taxes/past-years-products/
