To change your address with the IRS
CHANGE OF ADDRESS
https://www.irs.gov/faqs/irs-procedures/address-changes/address-changes
And make sure you have your mail forwarded by the U.S. postal service too.
BANKING INFORMATION
Your banking information cannot be changed after your tax return has been filed and accepted.
Banking information does not go from TT to the IRS until you file your 2020 tax return and it is accepted. The IRS will begin to accept and process 2020 returns at the end of January 2021.
You enter/change banking information in the FILE section before you file your 2020 return. Changing it on the TurboTax site does not do any good until you file your return and the IRS processes your return. If they manage to start sending out stimulus checks before you can change your information, we hope the IRS provides a way for you to change it with the IRS. Right now there are no new guidelines. If your check goes to a wrong or closed account, it will be sent back to the IRS and then the IRS will mail a check to the address on your tax return.
From the IRS:
Bank Account Information
Where did the IRS get my bank information, and what if I need to change it? (updated May 15, 2020)
No. To help protect against potential fraud, the tool does not allow people to change direct deposit information already on file with the IRS.
If we issue a direct deposit and the bank information is invalid or the bank account has been closed, the bank will reject the deposit. We will then mail your Payment as soon as possible to the address we have on file for you, and we will update Get My Payment to reflect the date your payment will be mailed. Typically, once the payment is mailed, it will take up to 14 days to receive the payment, standard mailing time.
If you did not have a direct deposit for the 2019 refund watch the IRS site to see if they will allow you to add a direct deposit to your information like they did last year (this will NOT work if you had banking info already on file). https://www.irs.gov/coronavirus/get-my-payment