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.
https://www.taxpayeradvocate.irs.gov/news/tax-tips/direct-deposit-changes-for-2026-could-affect-how-and-when-you-get-your-refund/2026/01/
You may get this notice— a cp53a notice
https://www.irs.gov/individuals/understanding-your-cp53a-notice
If you take NO action—-the IRS will freeze your refund for at least six weeks and then mail you a check.
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.
And……if you choose “refund processing” or the “5 day early” offer, those involve a third party bank; sadly, you will have a lot of additional aggravation in tracking down your refund and getting a check.