ETF vs Mutual Fund: How to decide which to use for investing in a popular index?
The factors to consider: What is your time horizon? Over long horizons, you absolutely want to minimise the expense ratio – a seemingly puny 2% fee p.a. can cost you a third of your savings over 35 years. Over short horizons, the cost of trading in and trading out might matter more. A mutual fund might be front-loaded, i.e. charge a fixed initial percentage when you first purchase it. ETFs, traded daily on an exchange just like a stock, don't have that. What you'll pay there is the broker commission, and the bid-ask spread (and possibly any premium/discount the ETF has vis-a-vis the underlying asset value).  Another thing to keep in mind is tracking error: how closely does the fond mirror the underlying index it attempts to track? More often than not it works against you. However, not sure there is a systematic difference between ETFs and funds there. Size and age of a fund can matter, indeed - I've had new and smallish ETFs that didn't take off close down, so I had to sell and re-allocate the money. Two more minor aspects: Synthetic ETFs and lending to short sellers. 1) Some ETFs are synthetic, that is, they don't buy all the underlying shares replicating the index, actually owning the shares. Instead, they put the money in the bank and enter a swap with a counter-party, typically an investment bank, that promises to pay them the equivalent return of holding that share portfolio. In this case, you have (implicit) credit exposure to that counter-party - if the index performs well, and they don't pay up, well, tough luck. The ETF was relying on that swap, never really held the shares comprising the index, and won't necessarily cough up the difference. 2) In a similar vein, some (non-synthetic) ETFs hold the shares, but then lend them out to short sellers, earning extra money. This will increase the profit of the ETF provider, and potentially decrease your expense ratio (if they pass some of the profit on, or charge lower fees). So, that's a good thing. In case of an operational screw up, or if the short seller can't fulfil their obligations to return the shares, there is a risk of a loss.  These two considerations are not really a factor in normal times (except in improving ETF expense ratios), but during the 2009 meltdown they were floated as things to consider. Mutual funds and ETFs re-invest or pay out dividends. For a given mutual fund, you might be able to choose, while ETFs typically are of one type or the other. Not sure how tax treatment differs there, though, sorry (not something I have to deal with in my jurisdiction).  As a rule of thumb though, as alex vieux says, for a popular index, ETFs will be cheaper over the long term. Very low cost mutual funds, such as Vanguard, might be competitive though. If you just want to track an index, then ETFs are, generally speaking, the better way.
"One reason is that it is not possible (at Vanguard and at many other brokerages) to auto-invest into ETFs.  Because the ETF trades like a stock, you typically must buy a whole number of shares.  This makes it difficult to do auto-investing where you invest, say, a fixed dollar amount each month.  If you're investing $100 and the ETF trades for $30 a share, you must either buy 3 shares and leave $10 unspent, or buy 4 and spend $20 more than you planned.  This makes auto-investing with dollar amounts difficult.  (It would be cool if there were brokerages that handled this for you, for instance by accumulating ""leftover"" cash until an additional whole share could be purchased, but I don't know of any.) A difference of 0.12% in the expense ratios is real, but small.  It may be outweighed by the psychological gains of being able to adopt a ""hands-off"" auto-investing plan.  With ETFs, you generally must remember to ""manually"" buy the shares yourself every so often.  For many average investors, the advantage of being able to invest without having to think about it at all is worth a small increase in expense ratio.  The 0.12% savings don't do you any good if you never remember to buy shares until the market is already up." I strongly suggest you go to www.investor.gov as it has excellent information regarding these types of questions. A mutual fund is a company that pools money from many investors and invests the money in securities such as stocks, bonds, and short-term debt. The combined holdings of the mutual fund are known as its portfolio. Investors buy shares in mutual funds. Each share represents an investor’s part ownership in the fund and the income it generates. When you buy shares of a mutual fund you're buying it at NAV, or net asset value.  The NAV is the value of the fund’s assets minus its liabilities. SEC rules require funds to calculate the NAV at least once daily. Different funds may own thousands of different stocks.  In order to calculate the NAV, the fund company must value every security it owns.  Since each security's valuation is changing throughout the day it's difficult to determine the valuation of the mutual fund except for when the market is closed.  Once the market has closed (4pm eastern) and securities are no longer trading, the company must get accurate valuations for every security and perform the valuation calculations and distribute the results to the pricing vendors.  This has to be done by 6pm eastern.  This is a difficult and, more importantly, a time consuming process to get it done right once per day.  Having worked for several fund companies I can tell you there are many days where companies are getting this done at the very last minute. When you place a buy or sell order for a mutual fund it doesn't matter what time you placed it as long as you entered it before 4pm ET.  Cutoff times may be earlier depending on who you're placing the order with.  If companies had to price their funds more frequently, they would undoubtedly raise their fees. An index fund is inherently diversified across its index -- no one stock will either make or break the results. In that case it's a matter of picking the index(es) you want to put the money into. ETFs do permit smaller initial purchases, which would let you do a reasonable mix of sectors. (That seems to be the one advantage of ETFs over traditional funds...?) "What does ETFs have to do with this or Amazon?   Actually, investing in ETFs means you are killing actively managed Mutual Funds (managed by people, fund managers) to get an average return (and loss) of the market that a computer manage instead of a person. And the ETF will surely have Amazon stocks because they are part of the index.  I only invest in actively managed mutual funds. Yes, most actively managed mutual funds can't do better than the index, but if you work a bit harder, you can find the many that do much better than the ""average"" that an index give you." "For US stocks it's a bit of a gamble. Many actively managed funds underperform the market indexes, but some of them outperform in many years. With an index you will get average results. With an active manager you ""might"" do better than average. So you can view active management as a higher risk, potentially higher reward investment approach. On the other hand, if you want to diversify some of your investments into international stocks, bonds, junk bonds, and real estate (REITs) active management is highly likely to be better than indexing. For these specialized areas specialized knowledge and research is needed." "An Exchange-Traded Fund (ETF) is a special type of mutual fund that is traded on the stock exchange like a stock.  To invest, you buy it through a stock broker, just as you would if you were buying an individual stock. When looking at a mutual fund based in the U.S., the easiest way to tell whether or not it is an ETF is by looking at the ticker symbol.  Traditional mutual funds have ticker symbols that end in ""X"", and ETFs have ticker symbols that do not end in ""X"".   The JPMorgan Emerging Markets Equity Fund, with ticker symbol JFAMX, is a traditional mutual fund, not an ETF.  JPMorgan does have ETFs; the JPMorgan Diversified Return Emerging Markets Equity ETF, with ticker symbol JPEM, is an example.  This ETF invests in similar stocks as JFAMX; however, because it is an index-based fund instead of an actively managed fund, it has lower fees. If you aren't sure about the ticker symbol, the advertising/prospectus of any ETF should clearly state that it is an ETF.  (In the example of JPEM above, they put ""ETF"" right in the fund name.)  If you don't see ETF mentioned, it is most likely a traditional mutual fund. Another way to tell is by looking at the ""investment minimums"" of the fund.  JFAMX has a minimum initial investment of $1000.  ETFs, however, do not have an investment minimum listed; because it is traded like a stock, you simply buy whole shares at whatever the current share price is.  So if you look at the ""Fees and Investment Minimums"" section of the JPEM page, you'll see the fees listed, but not any investment minimums." From an article I wrote a while back: “Dalbar Inc., a Boston-based financial services research firm, has been measuring the effects of investors’ decisions to buy, sell, and switch into and out of mutual funds since 1984. The key finding always has been that the average investor earns significantly less than the return reported by their funds. (For the 20 years ended Dec. 31, 2006, the average stock fund investor earned a paltry 4.3 average annual compounded return compared to 11.8 percent for the Standard & Poor’s 500 index.)” It's one thing to look at the indexes. But quite another to understand what other investors are actually getting. The propensity to sell low and buy high is proven by the data Dalbar publishes. And really makes the case to go after the magic S&P - 0.09% gotten from an ETF. "Does the bolded sentence apply for ETFs and ETF companies? No, the value of an ETF is determined by an exchange and thus the value of the share is whatever the trading price is. Thus, the price of an ETF may go up or down just like other securities. Money market funds can be a bit different as the mutual fund company will typically step in to avoid ""Breaking the Buck"" that could happen as a failure for that kind of fund. To wit,   must ETF companies invest a dollar in the ETF for every dollar that an   investor deposited in this aforesaid ETF? No, because an ETF is traded as shares on the market, unless you are using the creation/redemption mechanism for the ETF, you are buying and selling shares like most retail investors I'd suspect. If you are using the creation/redemption system then there are baskets of other securities that are being swapped either for shares in the ETF or from shares in the ETF." I think that assuming that you're not looking to trade the fund, an index Mutual Fund is a better overall value than an ETF. The cost difference is negligible, and the ability to dollar-cost average future contributions with no transaction costs. You also have to be careful with ETFs; the spreads are wide on a low-volume fund and some ETFs are going more exotic things that can burn a novice investor. Track two similar funds (say Vanguard Total Stock Market: VTSMX and Vanguard Total Stock Market ETF: VTI), you'll see that they track similarly.  If you are a more sophisticated investor, ETFs give you the ability to use options to hedge against declines in value without having to incur capital gains from the sale of the fund. (ie. 20 years from now, can use puts to make up for short-term losses instead of selling shares to avoid losses)  For most retail investors, I think you really need to justify using ETFs versus mutual funds. If anything, the limitations of mutual funds (no intra-day trading, no options, etc) discourage speculative behavior that is ultimately not in your best interest. EDIT: Since this answer was written, many brokers have begun offering a suite of ETFs with no transaction fees. That may push the cost equation over to support Index ETFs over Index Mutual Funds, particularly if it's a big ETF with narrow spreads.. "I'm not following what's the meaning of ""open a mutual fund"". You don't open a mutual fund, you invest in it. There's a minimum required investment ($2000? Could be, some funds have lower limits, you don't have to go with the Fidelity one necessarily), but in general it has nothing to do with your Roth IRA account. You can invest in mutual funds with any trading account, not just Roth IRA (or any other specific kind). If you invest in ETF's  - you can invest in funds just as well (subject to the minimums set). As to the plan itself - buying and selling ETF's will cost you commission, ~2-3% of your investment. Over several months, you may get positive returns, and may get negative returns, but keep in mind that you start with the 2-3% loss on day 1. Within a short period of time, especially in the current economic climate (which is very unstable - just out of recession, election year, etc etc), I would think that keeping the cash in a savings account would be a better choice. While with ETF you don't have any guarantees other than -3%, then with savings accounts you can at least have a guaranteed return of ~1% APY (i.e.: won't earn much over the course of your internship, but you'll keep your money safe for your long term investment). For the long term - the fluctuations of month to month don't matter much, so investing now for the next 50 years - you shouldn't care about the stock market going 10% in April. So, keep your 1000 in savings account, and if you want to invest 5000 in your Roth IRA - invest it then. Assuming of course that you're completely positive about not needing this money in the next several decades." "Your question is one of semantics.  ETFs and mutual funds have many things in common and provide essentially the same service to investors with minimal differences.  It's reasonably correct to say ""An ETF is a mutual fund that..."" and then follow up with some stuff that is not true of a typical mutual fund.  You could do the same with, for example, a hedge fund.  ""A hedge fund is a mutual fund that doesn't comply with most SEC regulations and thus is limited to accredited investors."" As a matter of practice, when people say ""mutual fund"" they are talking about traditional mutual funds and pretty much never including ETFs.  So is an ETF a mutual fund as the word is commonly used?  No." ETFs are a type of investment, not a specific choice. In other words, there are good ETFs and bad. What you see is the general statement that ETFs are preferable to most mutual funds, if only for the fact that they are low cost. An index ETF such as SPY (which reflects the S&P 500 index) has a .09% annual expense, vs a mutual fund which average a full percent or more.  sheegaon isn't wrong, I just have a different spin to offer you. Given a long term return of say even 8% (note - this question is not a debate of the long term return, and I purposely chose a low number compared to the long term average, closer to 10%) and the current CD rate of <1%, a 1% hit for the commission on the buy side doesn't bother me. The sell won't occur for a long time, and $8 on a $10K sale is no big deal. I'd not expect you to save $1K/yr in cash/CDs for the years it would take to make that $8 fee look tiny. Not when over time the growth will overshaddow this.  One day you will be in a position where the swings in the market will produce the random increase or decrease to your net worth in the $10s of thousands. Do you know why you won't lose a night's sleep over this? Because when you invested your first $1K, and started to pay attention to the market, you saw how some days had swings of 3 or 4%, and you built up an immunity to the day to day noise. You stayed invested and as you gained wealth, you stuck to the right rebalancing each year, so a market crash which took others down by 30%, only impacted you by 15-20, and you were ready for the next move to the upside. And you also saw that since mutual funds with their 1% fees never beat the index over time, you were happy to say you lagged the S&P by .09%, or 1% over 11 year's time vs those whose funds had some great years, but lost it all in the bad years.  And by the way, right until you are in the 25% bracket, Roth is the way to go. When you are at 25%, that's the time to use pre-tax accounts to get just below the cuttoff.  Last, welcome to SE.    Edit - see sheegaon's answer below. I agree, I missed the cost of the bid/ask spread. Going with the lowest cost (index) funds may make better sense for you.  To clarify, Sheehan points out that ETFs trade like a stock, a commission, and a bid/ask, both add to transaction cost. So, agreeing this is the case, an indexed-based mutual fund can provide the best of possible options. Reflecting the S&P (for example) less a small anual expense, .1% or less. In the past 10 years there have been mutual funds that would act as a single bucket of stocks and bonds. A good example is Fidelity's Four In One. The trade off was a management fee for the fund in exchange for having to manage the portfolio itself and pay separate commissions and fees. These days though it is very simple and pretty cheap to put together a basket of 5-6 ETFs that would represent a balanced portfolio. Whats even more interesting is that large online brokerage houses are starting to offer commission free trading of a number of ETFs, as long as they are not day traded and are held for a period similar to NTF mutual funds.  I think you could easily put together a basket of 5-6 ETFs to trade on Fidelity or TD Ameritrade commission free, and one that would represent a nice diversified portfolio. The main advantage is that you are not giving money to the fund manager but rather paying the minimal cost of investing in an index ETF. Overall this can save you an extra .5-1% annually on your portfolio, just in fees. Here are links to commission free ETF trading on Fidelity and TD Ameritrade. As has been pointed out, one isn't cheaper than the other. One may have a lower price per share than the other, but that's not the same thing. Let's pretend that the total market valuation of all the stocks within the index was $10,000,000. (Look, I said let's pretend.) You want to invest $1,000. For the time being, let's also pretend that your purchasing 0.01% of all the stock won't affect prices anywhere. One company splits the index into 10,000 parts worth $1,000 each. The other splits the same index into 10,000,000 parts worth $1 each. Both track the underlying index perfectly. If you invest $1,000 with the first company, you get one part; if you invest $1,000 with the second, you get 1,000 parts. Ignoring spreads, transaction fees and the like, immediately after the purchase, both are worth exactly $1,000 to you. Now, suppose the index goes up 2%. The first company's shares of the index (of which you would have exactly one) are now worth $1,020 each, and the second company's shares of the index (of which you would have exactly 1,000) are worth $1.02 each. In each case, you now have index shares valued at $1,020 for a 2% increase ($1,020 / $1,000 = 1.02 = 102% of your original investment). As you can see, there is no reason to look at the price per share unless you have to buy in terms of whole shares, which is common in the stock market but not necessarily common at all in mutual funds. Because in this case, both funds track the same underlying index, there is no real reason to purchase one rather than the other because you believe they will perform differently. In an ideal world, the two will perform exactly equally. The way to compare the price of mutual funds is to look at the expense ratio. The lower the expense ratio is, the cheaper the fund is, and the less of your money is being eroded every day in fees. Unless you have some very good reason to do differently, that is how you should compare the price of any investment vehicles that track the same underlying commodity (in this case, the S&P 500). consider capital requirements and risk timeframes. With options, the capital requirements are far smaller than owning the underlying securities with stops. Options also allow one to constrain risk to a timeframe of ones own choosing (the expiration date of the contract). If you own or are short the underlying security, there is no time horizon.