We have this system where we buy what we see fit and later fill out a form requesting that our employer pay back the expenses. I'm pretty sure there's a special term for it in English.
I'd also like to know if there are different names for such a form: a formal and official one as well as a colloquial, commonly used one.
Moreover, I'd like to know if those terms (both categories) are the same on both sides of the Sargasso Sea.