If you do not have an anticipated tax return refund TurboTax will not permit the entry of direct deposit information since this information would only be for your current 2019 tax situation.
The stimulus check details are still being worked out by the government at this time. We do not have information on how or if you will be able to update/add direct deposit information with them. Once this is clarified we will be able to provide more guidance. You can also stay updated by checking back on the following links.
https://turbotax.intuit.com/coronavirus/
https://www.irs.gov/coronavirus
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