Graduating a semester early will help save on costs associated with college, including tuition and room and board. Saving a semester's worth of tuition and books is thousands of dollars of saved costs.
Graduating early allows the graduate to begin a job search in the desired field earlier than other students. This four to six month advantage gives the early graduate a chance to begin on their career earlier. This allows them to begin building up money, save for important purchases and begin saving for retirement months earlier than students still in school.
After graduating, there are no more tests, papers or homework to complete. This reduces the amount of stress associated with tight deadlines and demanding professors. The early graduate is free to search for a job or travel as going to class is no longer a requirement.
If a bachelor's degree is obtained, the early graduate can begin to scope out or start applying for graduate degrees in the field of their choice. If the student is looking to become a doctor or lawyer, for example, graduating early will allow him to start medical or law school earlier than other students who graduate in four or more years.