You won't be able to file your 2018 tax return on the app. Please click the TurboTax FAQ below to learn how to file a prior year's tax return with TurboTax. You will need to mail it in as the IRS does not accept e-filed tax returns for a prior tax year:
https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-prepare-a-prior-year-tax-return/00/25...
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