Unfortunately, you can no longer e-file a 2018 return using TurboTax Online. Prior-year returns must be printed, signed and filed by mail. Additionally, you'll have to purchase the software in order to complete your return for printing. The TurboTax FAQ below will instruct you on completing a prior-year return that you started in TurboTax Online.
https://ttlc.intuit.com/community/prior-year-return/help/how-do-i-finish-a-prior-year-return-that-i-...
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*** I am NOT a tax expert. I am a seasoned TurboTax user, and volunteer to provide assistance to TT users. Nothing I post is to be considered TAX ADVICE; I bear no legal liability for responses.***
