Unless an exception exists, the entire first check is usually paid to a State/political
                  subdivision that is authorized to receive it as IAR, (see SI 02101.004A.2.), subject only to having an overpayment from another period recovered by adjustment
                  and any prior emergency advance payment, immediate payment, and presumptive disability/blindness
                  payment subtracted.
               
               IAR takes priority over issuance of an underpayment to a survivor.