How are rates calculated?
STAFFORD Loans While in school, interest accrues at a rate based on that 91-day T-Bill + 1.7%. Once out of school, interest accrues at a rate based on the same T-Bill + 2.3%. PLUS Loans Borrowers pay the rate on that 91-day T-Bill + 3.1% If you’d like help calculating your interest rate, try our online calculator.