Estimated Budgetary Impact of Bills to Prevent the Scheduled Increase in Interest Rates on New Federal Student Loans
from CBO Recent CBO Publications
Under current law, starting on July 1, the interest rate on new subsidized student loans will rise from the 3.4 percent in effect this year to 6.8 percent. During the past few days, CBO has released cost estimates for House and Senate bills that would delay that increase for one year.

http://www.cbo.gov/publication/43203