ETFs vs Index Mutual Funds
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Most people are familiar with passive Exchange Traded Funds. They typically have the lowest MERs available and can be purchased during any trading session. These are what attracted me to them a few years ago and they are still my preferred investment vehicle for the passive equities portion of my portfolio.
But could index mutual funds be a better choice? After all, they have a couple of seemingly big advantages over ETFs:
- It is easier to put in small amounts (both when initially investing and with subsequent purchases), since ETFs require whole share purchases (and preferably board lot purchses). The minimum initial investment can be as low as $500 and subsequent investments as little as $25.
- If you purchase the mutual fund through your self-directed RRSP, it’s unlikely there are any transaction fees.
With this in mind, I set out to determine which passive investment vehicle is better for an average family who is planning for retirement.
Here’s how I defined my typical family:
- $10,000 initial money to invest
- $200 savings each month for retirement
With the mutual fund, the family would put all $10K in at the beginning and all $200 each month for 30 years. With the ETF, the family would buy as many whole shares possible at the beginning and subsequently make purchases once they have ‘sufficient’ funds to do so. I deemed the RRSP account to have sufficient funds when the brokerage fees would account for less than or equal to 2.5% of a transaction. The brokerage fee is set to $29 per transaction and the cash accumulates in a non-interest bearing account.
To make things (possibly) more realistic, I assumed that the ETF would split its stock once its share price reached $150. I don’t know if any iShares or other ETFs have ever done this, but I believe that they would at some point if the share price ever got too large (much like the banks do to keep the per share price ‘accessible’ to regular investors). This makes purchasing the ETF a little less frequent towards the end.
In both cases, I took off the MER at the end of the year. I assumed that the growth of the underlying index is 8% annually. For the ETF, the MER resulted in a lower share price. For the index fund, I used an MER of 0.88% (which is the MER on TD’s Canadian Index Fund) and 0.17% for the ETF (which is what XIU has).
The results were a little surprising to me (you can see all the calculations here):
- Mutual fund account end value: $312,112.28
- ETF account end value (cash + stock value): $356,302.41
I didn’t think that the mutual fund account would underperform by nearly 12.5%. This just goes to show you how even a half a percentage point in MER makes a big difference to your retirement account. The underperformance is even greater if
- You start off with a larger initial investment
- The index returns higher annually
- The brokerage cost is lower
Note that because I have used a constant growth rate I am ignoring timing effects. It is likely that the ETF strategy will be more volatile since you are not purchasing every month. This could have a material impact on returns, since you may be purchasing at bad (or good) times more frequently than you would be with a steady monthly mutual fund deposit. Also, I see two other drawbacks:
- As far as I know, you can’t easily set up a stock purchase plan like this through a discount broker. That means you’re more responsible for making sure you purchase the ETF when you have sufficient funds.
- You may be more tempted to time the market, since you may not wish to buy the ETF if the market is dropping. While this may sound good, you’re not likely to be a good judge of when the market will hit bottom (and if you are, why are you reading this? Go out and make millions). So this method also requires more discipline.
Despite their hassles and potential drawbacks, I’d stick with the ETF strategy.
Related reading:
ETFs: the new Canadian investment idols
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