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Measuring Investment Performance: Annualised Returns vs Simple Returns:

Monday, October 09, 2017
By Kunal Bajaj

Kunal Bajaj, Founder & CEO,

What’s the right way to look at your portfolio’s performance? Which of the two should you use and when?

The last few years have been good for your investment portfolio. Some of your mutual fund investments have done exceedingly well. But knowing that your investment has doubled (i.e. grown 100%) is meaningless unless you know over what period this took place — doubling over 5 years indicates it has grown at a rate of 14.86% a year, doubling over 10 years implies growth of 7.17% a year, while doubling over 15 years means your investment has grown at only 4.73% a year.

There are two common ways to calculate gains:
Simple%age return or return on investment:

This is the simple%age gain of your holdings over the total investment amount, not annualised as in the IRR calculation. Simple%age return works over any time period. It simply indicates the change from one point in time to another.
For an investment that lasts exactly one year, the simple%age return is the same as the internal rate of return (IRR) below.

Annualised%age gain (IRR):
Annualised return or internal rate of return (IRR) is used show how an investment has performed over time. IRR calculates the%age return on an annualised basis regardless of the actual investment period. It doesn’t matter whether you hold an investment for one year, five years, or even fifty years — the internal rate of return will tell you the annualised%age returns of that investment over any period of time.

To get an accurate picture of your performance over the long term or against benchmarks like the Nifty, the internal rate of return is more informative because it describes the performance in consistent, annual terms.

How do I compute annualised gains or IRR?
The easiest way to do these challenging calculations is in Excel using the XIRR function — you need to have the investment dates, investment amounts and the current value handy. The screenshots below show the cash spent and cash returned for some sample investments. We have to input the cash outflows and inflows to help determine our internal rate of return.

Which one should you use?
At the end of the day, each calculation is useful in its own way. To monitor your performance over the long term or against benchmarks like the Nifty, the annualised return is more informative because it describes the performance in consistent, annual terms. However, for determining your gains over a shorter period or understanding your cash-on-cash returns, the simple%age return is easier to calculate and gives you everything you need. Simple%age gains work better in the short-term for investments such as equity funds that have more ups and downs. Annualised%age gains should be used for almost everything else, and over all time periods more than a year.

Your broker, distributor or investment adviser should be able to share the annualised%age gains (IRR) and simple%age gains for your investment portfolio — ask for both these numbers to find your true portfolio performance!
(The author is a SEBI-Registered Investment Advisor)

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