Some graduate students get funding beyond their TA, RA, or fellowship by doing extra work. Often, the extra funding is from teaching some or part of a course while on an RA or fellowship. However, most fellowships and some RAs limit how much time you can spend in other employment, or how much supplemental money you are allowed to earn. If you are on a several-year fellowship and you want to TA before it is over, you can usually defer a semester of your fellowship for a year, allowing you to be funded as a TA for a semester without losing your fellowship. You may also be able to get creative, doing research or teaching work for a faculty member in return for new equipment for your office or some other compensation. Just be careful to check on the rules governing your funding before you agree to do work for extra funding.