In order to e-file your 2018 tax return, you would need your AGI from your 2017 tax return. If you don't have your 2017 tax return, you can obtain your 2017 online on the IRS website. Please see this related TurboTax FAQ,Can I get a copy of my tax return from the IRS? https://ttlc.intuit.com/replies/3301999
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