Unfortunately, you cannot update bank information for the second payment. You may receive a check, but it is more likely that you will need to claim your payment as a credit when you file your 2020 tax return.
If you have not received your payment by January 15, 2021, you will claim the Recovery Rebate Credit by answering the two questions about the stimulus payments that will appear at the end of the TurboTax interview.
The questions are in the section Federal Review.
Once the information is entered you will see your refund increase or balance due decrease, and TurboTax will enter the amount of the credit on Line 30 of Form 1040 for you.
You’re wrong!
If you received a TurboTax email to update your stimulus payment direct deposit information, please follow these steps to update your information in the portal:
Note: You have to update your information by 1/15/2021.
For additional information, see Update your stimulus payment direct deposit information