You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Nonprofit_organization

Context:
Although NPOs are permitted to generate surplus revenues, they must be retained by the organization for its self-preservation, expansion, or plans. NPOs have controlling members or a board of directors. Many have paid staff including management, whereas others employ unpaid volunteers and even executives who work with or without compensation (occasionally nominal). In some countries, where there is a token fee, in general it is used to meet legal requirements for establishing a contract between the executive and the organization.

Question:
How does an NPO have to handle surplus money?

they must be retained by the organization for its self-preservation, expansion, or plans