Before investing in bonds, you must understand some things about bonds. Understanding what kind of bonds to purchase, what maturity date to purchase, is necessary before you begin to invest in them. Par value, maturity date and coupon rate. These three characteristics of a bond are the most important things to consider before purchasing a bond. Buying a bond without thoroughly studying these characteristics of a bond is the surest way to make the wrong decision.

The par value of a bond refers to the returns on your investment once the bond matures. It is the amount of money that you will receive at the maturity date. In other words, when buying a bond, it is important to note that you will be receiving your entire investment plus interest only at the maturity date. This is the bond's par value.

Naturally, the maturity date refers to the date that your bond reaches its full value. This is the date that you receive all the returns of your investment. However, when purchasing corporate, state and local government bonds, you do not need to wait until the maturity date before you obtain the money back. Such bonds can be 'called' before they reach the maturity date. When the bond is called, the corporation or government issuing the bond will return your investment as well as any interest your bond has earned up to that point in time. However, federal bonds are unable to be 'called'.