Firstly, indicating that you have learned or are in the process of learning Chinese can set you apart from other job applicants. Many industries find themselves saturated with job applicants who all have the same degree and want the same job. But what will set them apart and make them a valuable asset to the company? Bilingualism. This is especially important for transnational companies who will need representatives in China and other countries where Mandarin is spoken such as Thailand, Singapore, Malaysia, and Indonesia.
If you find that you haven’t gotten a promotion in years and you don’t seem to be advancing in your career, start attending some Mandarin classes. This is especially true for finance and manufacturing sectors where partnerships with Chinese clients have become increasingly popular. Learning Mandarin and being able to socialize in both formal and informal settings can create very strong ties with Chinese investors or partners and can place you in a very important position in your company. This will result in an increase in income and huge benefits and may also provide other opportunities for a higher salary.
If you are unhappy in your job, taking a Mandarin course can open a lot of doors for you. You can leave that boring job and take up a career in translation, create instruction manuals or any other field where being able to communicate in Mandarin is necessary. You will be able to work as a freelancer or for a corporation or even for a non-profit organization.
If you're still in university, consider taking up Mandarin as a second language. Many students have gotten overseas job offers right out a university, not because they are the top of their class, but because they are competent in the Mandarin language.