You must enter your 2019 AGI at the end of filing your return. If you filed your return using TurboTax last year, then your AGI may be automatically imported. You specifically asked where to enter 0. If you're entering 0, then this assumes you did not file a return in 2019, or your return for 2019 has not yet been processed. Either way, the AGI is entered during the finalization of your return.
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