An investment in savings certificates of £24.18 shillings in the second half of 1926 would now have a value of £486.72. This calculation is based on an investment period of 66.5 years and represents an average rate of return of about 4.5 per cent compound interest per annum tax free.
In recent years, rates of return on savings certificates have been much higher than this. However, amounts invested in 1926, in the first issue of savings certificates will have enjoyed these higher rates for the appropriate periods. For the initial periods of investment, however, interest rates were very low — reflecting market conditions at that time.
The rate of return on the current eleventh issue of savings certificates is 7 per cent compound interest per annum if the investment is held to five years. It should be noted that this return is tax free.