- A situation where something is overdue or not paid when it was due
- A situation when something, especially compensation, is applied retroactively, referring to a time prior to its occurrence
- After prolonged unresponsiveness from the debtor, the creditor cited a back payment issue with the court.
- The judge declared the lawsuit meritless and denied the back pay demanded by the plaintiff.
- An employee was owed back wages for the overtime hours he worked.