I checked with Student Accounts at Brooklyn. You don't pay extra--you just accelerate your payments so that you and FT students are now even up on tuition payments. Basically, except for personal expenses, and the time off the job market, a PT student and a FT student pay the same ammount for their degree. PT's do it over 4 years, FT's in 3. If you switch, up or down, Brooklyn adjusts the payments to maintain parity.