Four Words, Two Ideas: Managed Funds, Index Funds and ETFs

You're scrolling an investing site, or a forum thread. One post says managed fund. The next says mutual fund. Another says index fund, and someone replies that they just buy ETFs. The words seem to be used as if they all mean the same thing. And you can't tell whether you're looking at four different products, or one product with four names. It matters because you're about to put real money somewhere, and the label on the product tells you less than you'd hope. So here's the question for this episode: what's the actual difference between a managed fund, an index fund and an ETF? The short answer is that they aren't four versions of one thing. Some of these words describe how you buy and sell. Another describes what the fund is trying to do. Once you see that, most of the confusion falls away. Let's build it up, starting at the root. All of these products pool money. Many investors put cash into one big basket of securities, and each person owns a slice of the basket. That's the whole trick. It gave small investors something they couldn't easily build alone: spread across many companies, rather than a bet on a few. This isn't new. Mutual funds date back to the Netherlands in the second half of the eighteenth century. They were created so that small investors could diversify. Fast forward to January 1993, when State Street listed the first ETF, a fund tracking the S&P 500. That was the same pooling idea, delivered in a new way. So when you meet these four terms, remember they share a common ancestor. The differences are about delivery and approach, not about a different kind of investing. Now the first of those differences: structure, which is how you transact. An unlisted managed fund is bought and redeemed through the fund provider. You deal with the company that runs the fund. The price you get is a calculated unit price, often called NAV, which is the value of everything the fund holds, divided across its units. Managed fund is the Australian name for a mutual fund. An ETF works differently. It trades on an exchange, all day, at a market price. You buy it through a broker, the way you'd buy a share. Here's what that looks like in practice. Say you decide to sell at ten in the morning. With a managed fund, you don't get a ten o'clock price. You get the next unit price the fund works out after your request arrives. Many Australian funds set a daily cut-off: get your request in before it and you usually get that day's price, calculated after the market closes; miss it and you get the next business day's. With an ETF, you get whatever buyers are paying at that moment. And that price can differ slightly from NAV, because it's set by supply and demand rather than by a calculation. That raises an obvious worry. If an ETF's price is set by buyers and sellers, what stops it drifting far away from the value of what it holds? The answer is a mechanism called creation and redemption, and market makers are the ones who use it. Think of it as a correction loop. Suppose an ETF's market price drifts above the value of its underlying holdings. A market maker can create new units of the ETF, then sell them at the higher price. That extra supply pushes the price back down toward NAV. The same logic works in reverse when the price sags below. This is arbitrage, and it's the reason ETF prices tend to stay close to the value of their holdings. There's a catch. In stressed markets, that gap can widen. When the ETF trades above the value of its holdings, it's called a premium; below, a discount. The spread, the difference between what buyers bid and sellers ask, can widen at the same time. The loop works well when markets are calm. When they aren't, ETF prices can stray further from NAV than usual. It's worth knowing, even if it rarely matters in ordinary times. So that's structure: one way of buying through the provider at a calculated price, one way of buying on an exchange at a market price. Now the second difference, which is strategy, or who makes the investment decisions. An active fund pays managers to try to beat a benchmark. A benchmark is just a market measure, say the top companies on the Australian share market. The manager researches, picks, and trades, aiming to do better than that measure. An index fund does something much simpler. It replicates the benchmark. It holds what the index holds. That means no stock-picking team, and very little trading. And as we'll see, that's why index funds tend to be cheaper to run. Now here's the part that ties the episode together, and it's easiest to see by following one fund through. Take a broad Australian shares index fund. Step one: its strategy is to copy the index, so it holds what the index holds. Step two: put that strategy inside an unlisted managed fund, and you buy it from the provider at a calculated unit price. Step three: put the very same strategy inside an ASX-listed ETF, and you buy it through a broker at a market price, all day. Same strategy, two structures. And it works the other way too: some ETFs are actively managed, with a manager making choices rather than copying an index. One Australian source puts it sharply. It says comparing ETFs to managed funds is really comparing two settlement systems. That's the structure side of the story, nothing more. Which brings us to a common belief we should correct. You'll often hear that ETFs are passive and managed funds are active. As a rough pattern, that's sometimes true. But it's a pattern, not a rule. Index funds exist as both ETFs and unlisted managed funds. And a substantial and growing share of exchange-quoted funds in Australia are actively managed. So don't read the wrapper as a clue to the strategy. Check the strategy itself. Next, cost. Here's the useful principle: costs follow strategy more than structure, though each structure adds some costs of its own. Active strategies cost more to run, because you're paying for the research and the decisions. Index strategies cost less. In Australia, typical management fees run from about 0.05% to 1.50% a year. That's the spread between the cheapest large index funds and specialist active strategies. To make it concrete, VAS, a large ASX-listed index ETF, charges a management fee of 0.07% a year. That means seven cents for every hundred dollars invested. But the headline fee isn't the whole bill. ETFs add costs that you pay as you trade: brokerage, and the bid-ask spread, which is the small gap between the price buyers will pay and the price sellers will accept. These show up on every trade. A managed fund has its own transaction arrangements, including minimum investment amounts, which may differ from fund to fund. So compare total cost, not just the headline fee. For broad Australian or global shares, an ETF is usually the cheaper and more convenient route. But that's a general pattern, not a promise for every fund. Now the last piece, which explains why this topic gets so heated. Why did index versus active become the industry's defining argument? Because after fees, most active funds in many categories trail their benchmark over long stretches. Look at S&P's SPIVA data, as cited for Australia. In 2025, 74% of Australian Equity General funds underperformed their benchmark. The long-term average for that category is 60%. So most active funds in that group trail the index, and 2025 was worse than usual. Over longer periods in global shares, the picture is starker still. Global Equity General funds exceeded 95% underperformance over ten and fifteen years. That sounds like a clean win for index funds. But look at bonds. Only 27% of active Australian bond funds underperformed in 2025. So in that segment, active managers did better than the headline story suggests. The honest summary is that the picture depends on the asset class. One research estimate puts the average active shortfall at about 75 basis points, which is 0.75% a year. That's a rough average, and it hides a lot of variation. Now, where is the evidence weak? You should know the limits of what we've covered. First, several of the retail sources behind this episode are US-focused. Their fee ranges, load charges and tax claims may not carry over to Australia, which has a different tax regime. We've kept to the Australian figures where we could, and we haven't gone into tax at all. Second, some sources simplify ETFs as passive and mutual funds as active, and others contradict that. We've sided with the view that structure and strategy are separate, since that's what the Australian source describes. Third, active versus index results depend on the asset class and the time period. One study found that the most active US funds beat index funds in recessions, but slightly lagged in expansions. The average active fund was no different from the index fund in either. That study's sample ends in 2008, so it's old evidence. Fourth, one popular retail source offers a figure of one hundred and eighty-one thousand dollars as the cost of a fee gap, and claims index funds beat active funds eighty-five to ninety percent of the time over fifteen years. The dollar figure is a hypothetical illustration, and the percentage is US-focused. Neither should be treated as Australian evidence. And fifth, performance data can flatter funds. Counting only the funds that survived makes results look better than they were. That's survivorship bias, and one of the Australian sources flags it directly. We've also left out some things on purpose. We haven't tried to settle whether index funds or active funds are better overall, we haven't recommended specific funds or platforms, and we haven't dug into tax or portfolio building. The aim was only to decode the words. So, to recap. Managed fund and ETF are how you buy and sell. Index and active are who decides what the fund holds. Compare strategy, structure and total cost separately.