There is no way to change your bank information for the second stimulus payment. For security reasons, the IRS is not expected to provide a way to change it. If the account has been closed, the bank will reject the deposit. The IRS will then mail a check for your payment to the most recent address they have on file, which is usually the address on the last tax return that you filed. It will take about two weeks for you to get the check after the bank rejects the deposit.
