As nouns the difference between arrears and outstandings
is that arrears is an unpaid or overdue obligation a debt while outstandings is outstanding amounts; unpaid debts.
outstandings
English
References
* Google Books: [https://www.google.co.uk/search?tbs=bks%3A1&tbo=1&q=%22the+outstandings%22&btnG=Search+Books&gws_rd=ssl]