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You cannot e-file a 2018 return. It must be mailed in. Also, you cannot prepare a 2018 return with the Online version. The Online version is only to prepare the current years tax return, which is 2019.
To file a 2018 return with TurboTax you would need the 2018 Desktop software. You can purchase the 2018 Desktop software from TurboTax at the following website.
https://turbotax.intuit.com/personal-taxes/past-years-products/
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