ˌout-of-pocket exˈpenses noun [plural] small amounts of money that you have to spend as part of your job, and get back from your employer
[TahlilGaran] Dictionary of Contemporary English ▲
out of pocket expenses n. phr. Expenses one has to pay for oneself, not the company that sends one on a given assignment, such as tips for waiters, cab drivers, etc.
Luckily, my out-of-pocket expenses didn't amount to more than $15. [TahlilGaran] English Idioms Dictionary ▲