Interest is the cost of borrowing. When you borrow a federal student loan you are using federal funds for a period of time, and that use has a cost associated with it.

To better understand the effects of interest, you should know your principal balance. The principal balance is the original amount you borrowed, plus capitalized interest, less any principal payments.

There are different types of interest that can affect your student loan:

Fixed interest rates do not change. Current interest rates on federal student loans may be found on the federal student aid website.

Variable interest rates are tied to a certain index (depending on the type of loan and when it was received) and change periodically as the index changes. Student loans borrowed prior to July 1, 2006 had variable interest rates.

If you borrowed a loan prior to July 1, 2006, your initial interest rate was provided to you. Your interest rate should generally change each year, and your loan holder should inform you of any interest rate changes during the repayment period for your loan.

Simple interest is calculated only on the principal balance of your loan.

Accrued interest is calculated on your unpaid principal balance each day. The formula for calculating interest is:

Daily interest = (Annual Interest Rate/365.25 days) X Unpaid Principal Balance

Example: Interest accrual based on a $2,625 loan with an annual interest rate of 9 percent Daily interest = (.068 / 365.25 days) X $3,500 = $.65160848733 per day

Capitalized interest is unpaid, accrued interest that is added to the principal balance of your loan. It is also called "compound interest." When interest is capitalized, your total debt increases. It is very important to make interest payments on unsubsidized Federal Stafford Loans, even when you are not required to (e.g., when you are enrolled in school at least half time or during your grace period or authorized periods of deferment). By making interest payments, you can save yourself a considerable amount of money over a standard 10-year repayment period.