If you filed your 2019 tax return and marked that you could be claimed as a dependent on someone else's return you will not be eligible for a stimulus payment. You have two choices. 1. You can amend your return to correct that indication on your original return and once that processes become eligible for a stimulus payment this year. 2. Wait until filing your 2020 return and correctly indicate you are not a dependent and get the credit on next years return.
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