Unfortunately, you cannot correct your banking information once you have filed your return. If there's an issue where the IRS can't deposit a refund (ex wrong account number), then they
will mail you a paper check. They will send it to the address that they
have on file.
https://ttlc.intuit.com/questions/3628328-put-wrong-routeing-number-in
(
article includes info on wrong account number)
