Take A Raise But Don't Accept Compensation You Don't Deserve
Question :
Because of my position at work, I sometimes get compensation for being commissioned to do jobs abroad; however, I sometimes get this compensation without actually travelling. The manger of the department is the one who approved of this extra compensation. Can I take it?
Answer:
It is not permitted for somebody who has been given responsibility and duties to take money for those duties until he performs them. This is particularly the case in government departments, regardless of whether the manager sanctions the extra compensation. Instead of giving you compensation for work you do not perform, the manager should give you a raise or something similar.
Source:
Ibn Jibreen
Fatawa Islamiyah, Vol. 8 Page 101