20 CFR §416.543

We apply any underpayment due an individual to reduce any overpayment to that individual that we determine to exist (see § 416.558) for a different period, unless we have waived recovery of the overpayment under the provisions of §§ 416.550 through 416.556. Similarly, when an underpaid recipient dies, we first apply any amounts due the deceased recipient that would be payable to a survivor under § 416.542(b) against any overpayment to the survivor unless we have waived recovery of such overpayment under the provisions of §§ 416.550 through 416.556.