### DEFINITION of Average Annual Yield

The average yield on an investment or a portfolio is the sum of all interest, dividends or other income that the investment generates, divided by the age of the investment or length of time the investor has held it.

The average annual yield is a particularly useful tool for __floating-rate__ investments, in which the fund's balance and/or the interest rate change frequently. The average annual yield can also apply to a range of other investments, from __deposit accounts__, stock shares, commodities and/or real estate.

### BREAKING DOWN Average Annual Yield

For example, for a __savings account__ that pays a floating rate of interest on balances, the average yield can be calculated by adding all interest payments for the year and dividing that number by the __average balance__ for the year. The average annual yield is a backward-looking measurement and can also be very useful in determining the actual performance of a mixture of investments. In general, the average annual yield will determine performance over time on any multi-year investment.

### Average Annual Yield and Additional Yield Measurements

There a a variety of yield measurements that apply to many fixed income and money market securities. For example, the annual percentage yield or APY measures an investment’s __effective annual rate of return__, taking into account the effect of compounding interest and assuming a full 365 holding period. A seven day yield is the the annualized yield for a __money market mutual fund__, calculated based on the fund’s average seven day distribution.

For bonds, common yield terms include the __current yield__, which is a bond’s interest rate as a percentage of its current price. The yield to maturity or YTM estimates what an investor will receive if she held the bond to its maturity date. A tax-equivalent (TE) yield also refers to many non-taxable __municipal bonds__. The tax-equivalent yield fairly compares the yield of a tax-free bond to that of a taxable bond and is also known as after-tax yield.

Dividend-paying stocks also have a variety of yield measurements or __stock dividend__ yields. Yield on cost, for example, is a security’s annual __dividend rate__, divided by its average __cost basis__. Many companies, particularly older and more stable ones, pay out a portion of their earnings as dividends. Investors who seek out high yields for retirement income seek out and regularly calculate these yields. At times yields may become too high, however, implying that a company is over-extending itself.