Oct 13, 2015 What’s the Difference? Time Weighted Return versus Internal Rate of Return
A common question we hear from our clients is “what is my rate of return?” The true answer is: there is more than one way to look at returns. Understanding the differences can help you make better informed financial decisions.
The two most acceptable methods to calculate returns are Time-Weight Return (TWR) and Internal Rate of Return (IRR). Here are the key differences:
Internal Rate of Return (also called Dollar Weighted Return)
IRR is the measurement of your portfolio’s actual performance between two dates, including all cash inflow and outflows. Because of this, the IRR of a portfolio can be significantly affected by both the timing and size of any contribution or distribution. Luck in the timing of your inflows or outflows can drastically swing numbers one way or the other.
Using this method can be appropriate to determine how your portfolio has performed relative to your financial goals. However, it’s not an effective measurement tool for analyzing the long term performance of your portfolio’s underlying assets or comparing your investment manager to another manager or index. This is where TWR becomes useful.
Time-Weight Return (TWR):
This method compounds the daily returns of your account from the time it was initially funded until the present. The big difference it that TWR does NOT consider when you deposit or withdraw cash from the account. Simply stated, the TWR is the return on the very first dollar invested in the portfolio. Because of this, TWR represents a more accurate reflection of manager performance.
To really hammer home the difference, let’s look at an example. Say you invest $10,000 in an account on January 1st of this year. Your account increases in value 50% from January to June. You’re so pleased with performance that you put another $100,000 dollars into your account in June. Your account goes down 10% between June and the end of the year.
Since your account went up 50% for the first half of the year and then down only 10% the second half, your time weighted return is 35%. In contrast, your internal rate of return is a 5% loss. Why the difference? Most of your money was not invested until the middle of the year and missed the 50% rise. That money then declined and you ended up with less money than your total investment. Clearly, the timing of that $100,000 contribution was significant.
When looking at the performance of your accounts, it’s important to note how your returns are being calculated so you can understand what they are really telling you.
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