This document, which generally comes to you along with the letter of acceptance to the university, is used to secure a visa and to enter the United States. The I-20 is an indication to the consular officer that the university has found you to be academically admissible, financial capable, and liguistically prepared for your studies in the United States. As you begin to think about funding sources for your educational and living expenses in the United States, remember that you cannot count on working in the United States unless you have been granted a teaching or research assistantship. When you submit evidence of your financial resources, you cannot reply on potential income. The income on which you base your application must be assured and must be equal to or exceed the costs of the first year of your studies.
Immigration regulations are very strict with respect to working while carrying a student visa.
J-1 student status allows for similar employment, with similar restrictions, as long as permission is given by the exchange visitor program sponsor. M-1 visa holders for technical and vocational programs are not permitted to work during the course of their studies. Jobs available on campus typically do not pay much, certainly not enough to finance a university education. Do not count on this kind of a job for anything more than a supplement to other funds. If you are realistic about your financial needs, you will be better able to enjoy the exciting academic and cultural experience of living and learning in the United States.