If the IRS rejected your e-filed 2018 return, then it never received it, and you won’t get a stimulus check based on the return. Please see the TurboTax Help article "How do I fix a rejected return?" for guidance in correcting your return.
You can still file your 2019 tax return. Stimulus check amounts are based on information from your most recent tax filings, either 2019, or 2018 if you hadn't yet filed this season.
Please see TurboTax's Everything to help you get your stimulus check as soon as possible page to see if your return would qualify you for a 2020 stimulus check.
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