The annual interest rate for your investment. The actual rate of return is largely dependent on the types of investments you select. The Standard & Poor's 500® (S&P 500®) for the 10 years ending December 31st 2017, had an annual compounded rate of return of 8.3%, including reinvestment of dividends. From January 1, 1970 to December 31st 2017, the average annual compounded rate of return for the S&P 500®, including reinvestment of dividends, was approximately 10.6% (source: www.standardandpoors.com). Since 1970, the highest 12-month return was 61% (June 1982 through June 1983). The lowest 12-month return was -43% (March 2008 to March 2009). Savings accounts at a financial institution may pay as little as 0.25% or less but carry the significantly lower risk of loss of principal balances.