Fees and finances
Thanks to amazing efforts from the RA and TA unions, the Graduate Student fees for employees is much more reasonable. However, Masters students, who are not employees, should be aware that they will need to pay about $900-$1000 per semester in mandatory student fees (more for international students, depending on nationality). More information on the fees, including a breakdown of what the different fees are, is available here: [1]. These are due on September 15th and February 15th for the fall and spring semesters respectively, although they can each be split into several pieces, to be paid throughout the semester using the Time Option Payment Plan, (Please note that these dates may vary depending on the semester. Check SOLAR [2] for the most recent information). For incoming PHD students, you will still have about $50 (for domestic students) or $120 (for international students) in fees that you will need to pay each semester.
Additionally, there is a fee of about $100 due early in the summer for the student health clinic on campus. If at any point your expenses are too great the Stony Brook Graduate Student Organization (GSO) offers multiple forms of financial assistance, including emergency loans that are extremely useful and recreational reimbursement for such things as train tickets or concert tickets for any activities in which you may like to participate in the city.
Also note that members of the GSEU living off campus may have their Transportation Fee waived by the union.
If you will be a TA, you should be aware that you are paid over two-week pay periods, at the end of the following pay period. That is, you may not be paid until up to four weeks after you start. Do not be afraid to take out an emergency loan from the GSO or to ask to borrow from someone around you.
If you intend to get an off-campus apartment, you will probably need to pay two months' worth of rent when you sign the lease: the first month's rent plus a security deposit.