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Do we have to sign up for this check or will it automatically go into the account we used for taxes
If you need to just update your direct deposit information, see the following from the IRS.
The IRS does not have my direct deposit information. What can I do?
In the coming weeks, Treasury plans to develop a web-based portal for individuals to provide their banking information to the IRS online, so that individuals can receive payments immediately as opposed to checks in the mail.
https://www.irs.gov/coronavirus-tax-relief-and-economic-impact-payments
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