I need to change my bank information but I already filed .

[Mike9241]

if it's accepted you can

1) try calling the IRS 800-829-1040

2) however, if you can't reach the IRS or it has posted you'll have to wait for a check in the mail. This will take longer than normal because first the IRS will try for a direct deposit. when that fails the deposit is sent back to the IRS to issue a paper check which may take some time for it to be processed.  

[xmasbaby0]

If you e-filed:

Banking information for direct deposit is wrong or closed

If you entered incorrect banking information for your refund, you can change it if your return is rejected.  If it is accepted, however, it is too late to change it.  The bank will reject the refund and send it back to the IRS.  Then the IRS will issue a paper check and mail it to the address you put on your tax return.  Expect a delay of at least a couple of weeks to receive your refund.

Here is what the IRS says about entering incorrect banking information

https://www.irs.gov/help-resources/tools-faqs/faqs-for-individuals/frequently-asked-tax-questions-an...

If your refund is sent back to the IRS—- make certain that the address you entered on your Form 1040 is correct.  And…open all mail, even if it looks like junk mail.