If you entered direct deposit information on your 2018 or 2019 tax return, the IRS should have your bank information.
Please see How do I update my direct deposit bank account info with the IRS? and What do I need to do to get my stimulus check? in the TurboTax article Everything to help you get your stimulus check as soon as possible for additional information.
If you didn't file a 2018 or 2019 return, and didn't need to, see If you don’t need to file your taxes this year in the article linked above.
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