They should send you a letter, notifying you of the overpayment. You can also initiate the call to the IRS. Please see the information below, per the IRS:
What do I do if I find an uncredited or misapplied payment?
Contact us at the toll-free number listed on your notice with your information. Our representative will discuss the issue with you and provide further instructions.
What choices do I have about what to do with my overpayment?
You can have your overpayment credit refunded to you or you can have it applied to other taxes or tax periods.
For more information, see this link: Understanding Your CP268 Notice
How do I contact the Internal Revenue Service (IRS)?
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