To file a 2018 return you'll need to purchase and download the TurboTax software for PC or Mac as TurboTax Online and the mobile app are only available for the current tax year.
After installing the software, open it and follow the onscreen instructions.
Prior year returns must be paper-filed, as e-filing is no longer available. We'll walk you through that process when you get to the File section in the software.
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