When unused leave is paid out
On leaving is the common case. Under the UAE Labour Law a worker who quits before using accrued leave is entitled to a wage for those days, whatever the length of the leave, and to leave pay for the part of the final year they worked, in proportion. The employer also may not stop a worker using leave accrued for more than two years, unless the worker chooses to carry it forward or take a cash allowance for it under the establishment’s rules.
In other countries the answer may come from provincial law, a collective agreement or simply the company’s leave policy — check the one that applies before paying a balance out or refusing to.
