The discount rate is the percentage reduction from the face value of a bill, reflecting the interest cost to the purchaser. The bond equivalent rate is an annualized version of the discount rate, adjusted for a 365-day year, providing a comparable rate to bonds with semiannual interest payments.
The current price of a money market instrument is calculated by discounting its face value by the discount rate over the period until maturity, adjusted for a 360-day year, which is a banking convention.