per diem banking definition
Per diem interest is calculated and paid at loan closings. It is the pro-rated amount of interest due for remaining days in a month. For example, if a mortgage closes on July 29, per diem interest is calculated for July 29, 30 and 31.er diem interest is calculated and paid at loan closings. It is the pro-rated amount of interest due for remaining days in a month. For example, if a mortgage closes on July 29, per diem interest is calculated for July 29, 30 and 31.