This Halchipedia article states that a person is permitted to work on Chol Hamoed if there is a financial loss (Davar Ha'avud)
Let's say a person, who lives in U.S., has accumulated 10 paid vacation days. Let's assume that all the days of Chol Hamoed Succot and Hoshannah Rabbah are mid-week, so he would use up 5 vacation days. Thus, if he did not go to work, he would be paid for being out all of Succot including Chol Hamoed.
However, in a few months, his daughter who lives in Israel will be getting married. He wants to attend the wedding, and he would need to use 10 vacation days to make this trip. If he takes off during Chol Hamoed, he won't be able to take off to attend his daughter's wedding.
Does someone need to use his accumulated paid vacation days immediately, or can he go to work on Chol Hamoed because this scenario would be considered Davar Ha'aved? (a loss)?