Can I still e-file a 2018, 2017, or earlier tax return?

Not if you're filing a personal (1040) return, which has an e-filing window from January to mid-October after the tax year ends.

For example, the 2018 tax year ended on December 31, 2018, so that means personal returns were "e-fileable" in TurboTax from January through mid-October of 2019.

Also, IRS Free File Program delivered by TurboTax is not available for prior-year tax returns.

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