How do I Efile my 2018 return if I already chose file through mail?
You cannot e-file a 2018 return in TurboTax, you must mail it in. The current tax season is for 2019 tax returns which can be e-filed.
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I printed my 2020 tax forms and want to efile
@westmjb Please see the TurboTax FAQ below for instructions on how to switch from mail to e-file: How do I change from mail to e-file in TurboTax Online?