ETF vs index fund: what is the difference, and which is better?
Written by an ex-institutional trader. Why the question is slightly wrong, what actually differs between a listed ETF and an unlisted index fund in Australia, and a worked cost comparison for someone investing AUD 500 a month.
Direct answer
An index fund is an investment strategy: a fund that tracks a market index instead of picking stocks. An ETF is a wrapper: a fund that trades on a stock exchange. Most ETFs are index funds, so the two are not opposites. When Australians ask "ETF or index fund", they usually mean a listed ETF bought through a broker versus an unlisted index managed fund bought directly from the fund manager or through a platform.
The underlying portfolio is often identical. The differences are practical. ETFs generally have lower management fees (0.04 to 0.20 percent), trade at live prices, and cost brokerage plus a small bid-ask spread each time you buy. Unlisted index funds are priced once a day, accept exact dollar amounts and automatic contributions with no brokerage, but usually charge a higher management fee and a buy-sell spread. For lump sums and larger balances the ETF is usually cheaper. For small, frequent, automated contributions the unlisted fund can still win unless your broker charges zero brokerage.
Why the question is slightly wrong
"ETF or index fund?" compares two things that sit on different axes. Index fund describes what the fund does: it tracks an index. ETF describes how the fund is sold: on an exchange. Asking which is better is a bit like asking whether you should buy a diesel or a ute.
Most ETFs are index funds. VAS tracks the S&P/ASX 300. IVV tracks the S&P 500. They are index funds in an exchange-traded wrapper. And not every index fund is an ETF: Vanguard, iShares, and others have run unlisted index funds in Australia since the 1990s, which you buy by applying to the manager or through a super or investment platform.
So the real question is listed versus unlisted. In several cases it is literally the same pool of assets. VAS is the ETF class of the Vanguard Australian Shares Index Fund. The portfolio manager, the holdings, and the index are shared. What differs is the door you walk through and what it costs you to use it.
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Side by side
| Feature | ETF (listed) | Index fund (unlisted) |
|---|---|---|
| How you buy | Share broker, on the ASX or Cboe | Direct from the manager, or via a platform |
| Price you get | Live market price, known before you trade | End-of-day unit price, known after you apply |
| Management fee | Usually lower (0.04% to 0.20%) | Usually higher (0.16% to 0.30% retail) |
| Entry and exit cost | Brokerage plus bid-ask spread | Buy-sell spread, no brokerage |
| Minimum | One unit (AUD 500 first parcel at many brokers) | Set by the manager, often AUD 500 to 5,000 |
| Exact dollar amounts | Only with fractional-unit brokers | Yes, always |
| Automatic investing | Some brokers | Standard (direct debit, BPAY) |
| Selling to cash | T+2 settlement | Typically 3 to 7 business days |
| Holding record | CHESS (your HIN) or broker custody | Fund registry or platform |
Two rows deserve a comment. Price certainty matters more than people expect on volatile days: with an unlisted fund you submit an application at 11 am and receive whatever the unit price turns out to be that evening. With an ETF you see the price and can set a limit. And exact dollar amounts are the quiet advantage of unlisted funds. AUD 500 buys exactly AUD 500 of units, down to four decimal places, with nothing left sitting idle in a cash account.
The cost comparison, worked
Take an investor putting AUD 500 a month into Australian shares. Assume an ETF with a 0.07 percent management fee and a 0.03 percent bid-ask cost per purchase, against an unlisted index fund with a 0.18 percent management fee and a 0.05 percent buy spread. These are representative figures, not quotes for a specific product.
| Scenario | ETF, AUD 0 brokerage | ETF, AUD 5 brokerage | ETF, AUD 10 brokerage | Unlisted index fund |
|---|---|---|---|---|
| Trading cost per year | AUD 1.80 | AUD 61.80 | AUD 121.80 | AUD 3.00 |
| Management fee, AUD 10,000 balance | AUD 7 | AUD 7 | AUD 7 | AUD 18 |
| Total, AUD 10,000 balance | AUD 8.80 | AUD 68.80 | AUD 128.80 | AUD 21.00 |
| Management fee, AUD 100,000 balance | AUD 70 | AUD 70 | AUD 70 | AUD 180 |
| Total, AUD 100,000 balance | AUD 71.80 | AUD 131.80 | AUD 191.80 | AUD 183.00 |
The pattern is clear once it is laid out. On a small balance, brokerage is the whole story: AUD 5 a month in brokerage swamps an AUD 11 a year fee advantage. On a large balance, the management fee is the whole story, and the ETF pulls ahead even with AUD 5 brokerage. With these inputs the crossover for the AUD 5 case sits at a balance of roughly AUD 53,000.
Three ways people tilt this in their favour: use a broker with zero or near-zero brokerage on ETFs, buy quarterly instead of monthly (AUD 1,500 four times a year cuts brokerage by two thirds), or start in the unlisted fund and move to ETFs for new money once the balance is meaningful. Selling the unlisted fund to switch would trigger capital gains tax, so most people simply redirect contributions.
Is there a tax difference?
Less than American articles suggest. In the United States, ETFs have a structural tax advantage over mutual funds because of how in-kind redemptions work there. That is a US rule and it does not carry across.
In Australia both structures are trusts that attribute their income and realised capital gains to investors each year, and both send you an annual tax statement. The practical differences are small:
- Unlisted funds must sell assets to pay out redeeming investors, which can realise gains that are distributed to everyone who remains. ETFs can stream the gains from a redemption to the redeeming market maker, so long-term holders tend to receive slightly smaller capital gain distributions. It is a modest edge, not a decisive one.
- Both qualify for the 50 percent CGT discount when you sell units held for more than 12 months.
- Both pass through franking credits from Australian shares.
The full treatment, including how distributions are taxed and how to adjust your cost base, is in the ETF tax guide.
Which suits which investor
An ETF tends to suit you if you are investing a lump sum, you already have a share-trading account, your broker charges little or nothing for ETF trades, you want the lowest ongoing fee, or you want access to markets that unlisted funds rarely cover (single sectors, gold, bonds of a specific maturity).
An unlisted index fund tends to suit you if you want a fully automated direct debit and never want to log in, you are investing small amounts where any brokerage would hurt, or you are investing through a super or wrap platform where unlisted funds are the default menu.
Plenty of investors end up with both, and there is nothing wrong with that. The underlying shares do not know which wrapper you used. If you have settled on the listed route, how to invest in ETFs in Australia covers broker choice, CHESS sponsorship, and order types. The sibling comparison for actively managed products is ETF vs managed fund.
What neither is built for
Both wrappers are designed for owning a market for years. Neither is a good instrument for a three-day view on the S&P 500 or for profiting from a fall. An unlisted fund cannot be shorted at all and takes days to exit. An ASX-listed ETF can technically be traded intraday, but there is no leverage, shorting is impractical for retail accounts, and the US-listed ETFs that traders actually follow (SPY, QQQ, IWM) are not on the ASX.
Short-term traders generally use ETF CFDs through an ASIC-regulated broker instead, which allow long and short positions with leverage capped at 5:1 for retail clients. That is a different activity with a different risk profile: most retail CFD accounts lose money, there are overnight financing costs, and profits are generally taxed as ordinary income without the CGT discount. If that is what you are looking for, read ETF trading in Australia before opening anything.
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Open AvaTrade accountSources and primary references
- ASIC Moneysmart: managed funds and ETFs - how listed and unlisted managed funds work, their fees, and their risks.
- ASX: ETFs and other exchange traded products - listing structure and trading mechanics.
- ATO: investing in shares and funds - tax treatment of managed fund and ETF distributions and capital gains.
Cost figures in the worked example are representative assumptions for illustration, not quotes for a specific product. Check the current PDS and your broker's fee schedule. Last reviewed: 2026-09-19.
Frequently asked questions
What is the difference between an ETF and an index fund?
An index fund is any fund that tracks a market index rather than trying to beat it. An ETF is a fund that is listed and traded on a stock exchange. The categories overlap: most ETFs are index funds. In everyday Australian usage, 'index fund' usually means an unlisted managed fund you apply for directly with the manager or through a platform, priced once a day, while 'ETF' means the exchange-listed version you buy through a share broker at live prices.
Is an ETF better than an index fund?
Neither is better in every case. ETFs usually have lower management fees and no minimum beyond the price of a unit, which favours lump sums and larger balances. Unlisted index funds accept exact dollar amounts and automated contributions without brokerage, which favours small regular investing. If your broker charges zero or very low brokerage on ETFs, the ETF tends to win on cost in almost every scenario.
Is VAS an ETF or an index fund?
Both. VAS, the Vanguard Australian Shares Index ETF, is an exchange traded fund and it is also an index fund because it tracks the S&P/ASX 300 Index. It is in fact the ETF class of the same underlying Vanguard Australian Shares Index Fund that Vanguard offers in unlisted form. Same portfolio, two ways in.
Are index funds safer than ETFs?
No. Risk comes from what the fund holds, not from the wrapper. An unlisted ASX 300 index fund and an ASX 300 ETF holding the same shares will rise and fall together. Both are regulated managed investment schemes with assets held by an independent custodian. The ETF adds a small amount of trading risk (you can buy at a poor price if you use a market order in a thin market), and the unlisted fund adds a small amount of timing risk (you do not know your price until after you apply).
Do ETFs or index funds have lower fees in Australia?
ETFs usually have lower management fees. Broad Australian and US share ETFs charge roughly 0.04 to 0.10 percent a year, while the unlisted retail index funds tracking the same indexes commonly charge around 0.16 to 0.30 percent. Against that, ETFs incur brokerage and a bid-ask spread on each trade, while unlisted funds charge a buy-sell spread (often 0.05 to 0.10 percent) and no brokerage.
Can you lose money in an index fund or ETF?
Yes. Both follow the market they track, so a 25 percent fall in the index means a fall of about 25 percent in your investment. Diversification removes the risk of a single company failing; it does not remove the risk of the whole market falling. Neither product is capital guaranteed.
Should I choose an ETF or an index fund for investing AUD 500 a month?
Work out the brokerage first. At AUD 5 per trade, a monthly AUD 500 purchase costs 1 percent in brokerage, which is far more than the management fee saving an ETF gives you on a small balance. At zero brokerage the ETF is cheaper from day one. At AUD 10 or more per trade, either buy quarterly instead of monthly or use an unlisted index fund with automatic contributions until the balance is large enough for the lower ETF fee to dominate. This is general information, not personal advice.
