BOND EQUIVALENT YIELD (BEY)
Back to GlossaryDefinition
A method to annualize yields on short-term discount instruments for comparison with coupon-bearing bonds.
Summary
Bond Equivalent Yield (BEY) is a standardized way to calculate and compare the annual returns of different types of bonds and money market instruments. Since short-term discount securities (like Treasury bills) are typically quoted on a discount basis and may have different time periods until maturity, BEY converts these yields to an annualized basis that matches how coupon-bearing bonds are quoted. This allows investors to make 'apples-to-apples' comparisons between different fixed-income investments, regardless of their original yield calculation method or maturity period.
Usage Context
Essential when studying fixed-income securities, money markets, and investment analysis. Critical for understanding how to compare yields across different types of debt instruments and for making informed investment decisions in bond and money market portfolios.
Common Confusions
- Thinking BEY and discount yield are the same thing
- Confusing BEY with compound annual growth rate (CAGR)
- Not understanding that BEY uses simple interest, not compound interest
- Assuming all bond yields are already comparable without conversion
- Mixing up the 360-day and 365-day year conventions used in different calculations
