posted: Mar. 21, 2008 @ 10:06p
ferengi31337 said:Bobalude said:ETFs may not be a good choice for many small frequent transactions because each buy/sell is a trade (i.e. monthly investing). A more traditional mutual (or index) fund does not have the same buy/sell cost structure charged to the individual, its spread as a cost to the fund.
This is only true for small total investments.
Suppose you can invest $20k in a mutual fund with 1% fees or an ETF with 0.1% fees, but your broker charges $10 per trade. The mutual fund costs 20000*0.01 = $200 per year. The ETF, if you make one trade per month, costs 20000*0.001+10*12 = $140 per year. So you come out ahead even if you pay a commission every month because the fees are so drastically lower.
Thats apples to oranges though because the fund with 1% fees is different inherently than an ETF. If you choose a 1% expense fund, you probably are selecting something different from the ETF, whether it be active management, a specialized strategy, service fees for a broker, etc. Whether those extra costs are better or not is up to the eye of the beholder.
If he wanted to stay strictly within indexed based ETFs and index mutual funds, the difference is much smaller in expense ratios so trading fees may cost more for frequent transactions. Say Vanguard open-end index funds vs similar ETFs. Don't forget any buy/ask spread, as well as discount/premiums to NAV that may or may not help an ETF.
You are right that someone can calculate a break-even point between index funds and index ETFs though to help decide at what point is it more beneficial to switch.