Calculating return would have been easier, if we had been investing exactly for one year. But that doesn’t happen in practical world. Investment is normally done in staggered manner and each investment is not kept for same period of time. Withdrawal also might happen over a period of time.
To compare the return from various investment plans, it is necessary to have a common parameter which can be used for all types of investments with different investment amounts and different holding period. That common parameter is to assume that all investment returns get compounded annually.
If investment is held for lesser than one year, then we need to calculate the return in percentage terms by assuming that the investment is held for one year.
CAGR – Compounded Annual Growth Rate
If you want to calculate the return for one time investment then CAGR (Compounded Annual Growth Rate) is used. But when the investment is done periodically or staggered over a period of time, CAGR is not useful to calculate the return.
In case of staggered investment, either IRR or XIRR can be used.
IRR – Internal Rate of Return
If the investment is done in strict periodic manner, you may use IRR to find out the rate of return. For example if investment is done at fix interval (Monthly/quarterly/yearly) and withdrawal only at the end of the entire tenure, IRR can be used to find out the return.
If cashflow includes frequent inflow as well as outflow over a period of time, we need to use XIRR for calculating the rate of return. XIRR gives you the flexibility to assign specific dates for each cash flow, making it a much more accurate calculation.
Though Return is one of the most important criteria but we should also look at other parameters like consistency, portfolio quality, risk, risk adjusted returns etc.
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