Mutual funds explained for beginners

Mutual funds are the plain, mainstream way people invest without picking shares one by one. You put money into a pooled pot, a manager usually runs it, and you own a slice of the whole thing.

They're simple, spread your risk automatically, and don't demand much day-to-day effort. Some are cheap and quietly track the market. Others charge more and rely on a manager trying to beat it.

They're popular for a reason, particularly with beginner investors, but they aren't totally risk-free. In certain cases – when funds hold assets that are hard to sell – trading can be paused during periods of market stress.

This guide explains why people use mutual funds, how their pricing works, the occasional risks, how they differ from ETFs, and how to invest in them in practice.

What is a mutual fund? 

Think of a mutual fund as a shared investment kitty.

Lots of investors put their money in, and a professional manager decides how that money is invested. You don't own the individual shares or bonds; instead, you own a slice of the whole pot.

When the investments rise in value, your share grows. When they fall, it shrinks.

In the UK, these are usually called funds, unit trusts, or OEICs – but in practical terms they're all mutual funds. 

You'll often hear them described as "open-ended", meaning the kitty grows when new money comes in and shrinks when investors cash out.

What do mutual funds invest in?

Pretty much anything you can think of. The world of mutual funds is vast, but most fall into a few familiar categories:

• Equity funds. These invest in shares (stocks), often focusing on a specific region (like UK or global), or a type of company, for example, those that pay healthy dividends
• Bond funds. These put your money into debt securities – think UK gilts or company-issued bonds – for those after a steadier, income-focused ride
• Sector and thematic funds. If you want to bet on technology, healthcare, blockchain or even our ageing population, these funds zero in on a particular trend
• ESG funds. For the ethically minded, these pick companies that claim to meet certain environmental, social, and governance standards – though how strict those standards really are can be up for debate.

Whatever your interest, there's probably a mutual fund aimed at it (sometimes several hundred).

How mutual funds work in practice

You buy units in the fund, not individual shares or bonds. Each unit represents a proportional share of everything the fund owns.

You deal directly with the fund, usually through an investment platform, rather than trading with other investors on a stock exchange.

Mutual funds can be held inside ISAs and pensions, so tax is usually handled at the wrapper level rather than inside the fund.

Why people use them

A mutual fund offers:

• Instant diversification
• Professional management
• Minimal day-to-day decision-making.

You avoid building a portfolio one holding at a time and leave the buying and selling to someone else.

The trade-off is that you give up control, pay a fee, and stick your head in the sand while hoping everyone involved is behaving themselves and making good calls.

How mutual fund pricing works

Share prices are hyperactive.

They twitch every second, react to rumours, headlines, and tweets, and seem to change their mind halfway through a sentence. If you want, you can watch the number flicker all day and convince yourself you're in control.

A mutual fund sits at the other end of the spectrum.

It has one price a day. That price reflects the total value of everything the fund owns, divided by the number of units in existence. If the investments rise in value, the price goes up. If they fall, it goes down. Simple enough.

Where things get peculiar

The odd bit is the timing.

When you buy or sell a fund, you do it before the price is known. Your order goes through at the next valuation point, usually around midday or the end of the working day. Put your order in early enough and you get today’s price. Miss the cut-off and you get tomorrow’s.

There's no live quote to stare at and no moment to strike. You're effectively saying "I'll take whatever it's worth later".

Everyone buying or selling on the same day gets the same price, which is fair, orderly, and... mildly irritating if you enjoy timing things. You cannot lock in the morning's price just because markets had a wobble and you fancied buying into the dip.

Behind the scenes, the fund's administrators tot everything up, apply any small adjustments to cover dealing costs, and publish a single number. That number is the price.

For long-term investors, this is usually fine. It removes noise and keeps things pleasantly boring.

Active vs passive funds: what you're really choosing

Every mutual fund sits somewhere on a spectrum. At one end, someone is trying very hard to be clever. At the other, nobody is trying to be clever at all.

Those are the two styles.

Active funds

Active funds are run by managers who believe judgement matters.

They pick what to buy, what to sell, and when to do it. The aim is to beat the market, not just follow it. That might mean backing a tight selection of companies, avoiding unfashionable sectors, or making big calls when things look shaky.

In practice, you're paying for:

• Human judgement
• Research teams and analysts
• The hope that skill outweighs luck

Sometimes it works. Often it doesn't. In fact, over the past 10 years, just 24% of active fund managers were able to beat passive alternatives across a range of equity sectors.

And when a fund underperforms, you can't petulantly withhold the fee like a diner refusing to tip. You're still paying, even if they manage to blow up the portfolio.

Passive funds (index funds)

Passive funds do not try to be clever.

They track a market index and get on with it. If the index goes up, they go up. If it goes down, they go down. There's no stock-picking and no tactical drama.

You're paying for:

• Broad market exposure
• Low costs
• The acceptance that you will get the market's return, for better or worse.

It's dull by design, but often in a pleasant way – a rainy-afternoon jigsaw with your grandad rather than a thrill ride.

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Mutual funds vs ETFs: the differences that matter in practice

At heart, mutual funds and Exchange-Traded Funds (ETFs) are cousins. Both give you a basket of investments in one go. Both can track markets. Both can live happily inside an ISA or pension.

Still, despite these commonalities, there are important differences to keep in mind:

How they trade

• Mutual funds have one price a day. You place your order and find out the price later. Calm, orderly, slightly paternal
• ETFs trade like shares. Prices move all day. You can buy at breakfast, sell after lunch, and feel very involved.

Control versus convenience

• Funds are built for regular investing. Small amounts, monthly direct debits, no leftover change – though they tend to have higher minimum investment amounts
• ETFs are built for flexibility. You choose the moment, the price, and the order type. You may also end up with spare cash sitting around doing nothing. You can invest for in much smaller amounts – sometimes as little as £1 thanks to fractional shares.

Pricing quirks

• Mutual funds always trade at net asset value (NAV). The NAV is calculated once a day by adding up the value of all the underlying holdings, subtracting costs, and dividing by the number of units. Everyone buying or selling that day gets the same price, worked out from the value of everything the fund owns. There may be a small adjustment to reflect the real costs of buying and selling investments, so those costs are shared fairly between everyone.
• ETFs also have a NAV, but they trade on an exchange. Their market price moves during the day based on supply and demand, so it usually sits close to NAV but is not fixed to it. The price can drift slightly above or below NAV, especially in volatile markets or when the underlying assets are less liquid.

Feature	Mutual funds	ETFs
What they are	A pooled fund giving you a basket of investments in one go	A pooled fund giving you a basket of investments in one go
Where you buy them	Bought directly from the fund provider or via a platform	Bought and sold on a stock exchange, like shares
How they trade	One price a day. You place your order and find out the price later	Trade throughout the day. Prices move constantly
Pricing method	Always trade at net asset value (NAV), calculated once a day	Trade at a live market price that usually sits close to it
Price certainty	Everyone buying or selling that day gets the same price	You get the price available at the moment you trade
Cost	Tend to require a higher minimum investment	Tend to require a lower minimum investment
Dealing flexibility	Minimal. You invest when the fund deals, not when you choose	High. You choose the timing, order type, and price
Leftover cash	None. Every penny is invested.	More common. You may end up with spare cash.

Read more: Index mutual funds vs ETFs – the differences explained

Fees: the slow leak in the tyre

Fees matter because they skim your returns every year. The upside is that mutual fund charges are usually well disclosed. Every fund has a Key Investor Document spelling out what you pay. 

Ongoing charge (OCF)

This is the main one. It is the annual cost of running the fund. It covers the manager, administration, custody, accounting, regulation and the general machinery humming away in the background.

The OCF is quoted as a percentage per year. An OCF of 0.75% means roughly that much of the fund's value is taken annually. You don't get a bill – the charge is taken from the fund itself, a little bit each day, so the price you see is already net of fees.

If markets deliver 7% and the fund charges 0.75%, you keep roughly 6.25%.

Index funds are usually cheap – think 0.1% to 0.3% a year. Actively managed funds cost more, often 0.5% to 1%+.

That said, average fees have been drifting down for years as investors have piled into cheaper options. In fact, the UK now has the lowest average fund fees in Europe.

Performance fees

Most UK retail funds do not use performance fees, but a minority do.

A performance fee means the manager takes an extra cut if returns beat a stated benchmark. On paper, that sounds reasonable. In practice, it can create awkward incentives.

Because the upside is shared but the downside is not, managers may be tempted to take bigger risks to try to beat the benchmark, especially over shorter periods. If it works, they get paid more. If it fails, the investor bears the loss.

Performance fees can also be asymmetric or poorly designed. Some apply even if a fund has merely recovered from previous losses, or if the benchmark itself is easy to beat. Others reset annually, encouraging short-term thinking rather than steady long-term management.

They also make it harder to understand what you're really paying, because your total fee depends on outcomes rather than being known in advance.

For beginners, the simplest option is usually best. Funds with performance fees are more complex and less predictable. There are plenty of good, low-cost funds without them.

Transaction costs inside the fund

When a fund buys and sells investments, there are dealing costs. Brokerage fees, stamp duty on UK shares and bid-offer spreads all add up.

You don't pay these directly, but they still come out of performance. Funds with lots of trading tend to have higher transaction costs. Passive funds usually have lower ones because they trade less.

These costs are often shown in the documentation as a small percentage. For many equity funds they might be around 0.1% to 0.3% a year, but it varies.

Entry and exit charges

These used to be a thing, but they mostly are not anymore.

Older funds sometimes had chunky upfront charges, but fortunately modern clean share classes generally do not. If you invest through a mainstream UK platform, entry and exit fees are usually zero.

If you ever see a reference to a bid offer spread on a fund, that is effectively a small entry or exit adjustment to cover trading costs. It is now uncommon for large retail funds, but still worth checking.

Platform fees

These sit outside the fund but still count.

Most UK platforms charge you for holding funds. Often, it's an annual percentage of what you hold. For example, some platforms charge around 0.45% on funds, others closer to 0.25%. Some use fixed fees instead.

This is on top of the fund's own charges. The real cost is the whole stack. Fund fee plus platform fee plus any dealing costs.

Liquidity and redemption risk

Open-ended mutual funds promise daily liquidity. You can usually sell your units on any dealing day and receive the fund's net asset value (NAV).

That works smoothly when the fund owns things that are easy to sell, like large company shares or government bonds. It gets awkward when the fund owns things that very obviously cannot be shifted at short notice.

Property funds are the classic example.

If lots of investors ask for their money back at once, the fund cannot sell office blocks, shopping centres, or warehouses fast enough to raise the cash. When that happens, the manager may suspend dealing. Trading stops. You wait. This has happened before and may well happen again.

In other words: the price is fair and orderly, but access to your money can be temporarily switched off. That's the trade-off built into open-ended funds holding illiquid assets.

Property ETFs work differently

To illustrate the difference, a property ETF has exposure to the same sector, only it trades on the stock market. When you sell, you are not asking the fund to hand you cash. You are selling your holding to another investor.

That means you can usually sell even when markets are stressed. Trading keeps going, but there's a catch: your share of beach-side villas and office blocks may suddenly be worth about 50p and a pack of Quavers compared with what you paid for them.

If everyone suddenly decides property is toxic, the ETF price can fall far below the underlying NAV. You get out, but you probably take a bigger haircut than Orlando Bloom after he finished playing Legolas.

Think of it as selling your house during a panic rather than being told the estate agent has locked the door and gone home.

So the distinction looks like this:

Funds:

• You trade at NAV
• Price certainty
• Access can be paused in extreme cases.

ETFs:

• You can usually trade whenever the market is open
• Access is continuous
• Price can swing, sometimes violently.

Or to put it another way: funds promise a fair price, but not instant access. ETFs promise instant access, but not a fair price.

How to invest in mutual funds

Investing in a mutual fund is pretty straightforward. The decisions that matter are less about how to do it, and more about where you do it and what you choose.

1. Find a broker

You won't find mutual funds on every investment platform. Some of the newer, ETF-first brokers – such as InvestEngine or Trading 212 – don't offer them at all.

Our broker comparison tool lets you filter specifically for "mutual funds", so you can quickly see which platforms support them.

Pay close attention to fees. Platform charges for mutual funds vary a lot between providers and can have a big impact on long-term returns. We've broken down the cheapest and best options for mutual fund investors here.

And remember: if you invest through an ISA or a SIPP, any growth or income from the fund is free from capital gains tax and dividend tax.

2. Choose a fund

Mutual funds are usually grouped by risk level and by what they invest in. As a rule of thumb, funds with a higher proportion of equities (shares) are riskier, but also offer higher potential returns over the long term.

If you're investing for 10 or 20 years, you may be comfortable taking on more risk than someone who expects to need the money sooner.

You'll also need to decide between passive (index-tracking) funds and active funds. Most brokers let you filter by fund type, and show how each fund has performed against its benchmark – the index it aims to track or beat. Past performance isn't a guarantee of future returns, but it can still provide useful context.

Here's an example from Vanguard's active UK equity fund:

Bottom line

Mutual funds are built for people who want diversification and simplicity rather than speed and control. You buy at one fair price a day, pay a fee for someone else to run the pot, and let compounding do the work. 

There are different flavours on the menu. Some are plain and cheap, tracking the market and getting out of the way. Others are richer and more expensive, with a manager trying to add something extra.

Very occasionally the doors close – meaning dealing is temporarily suspended in funds that hold hard-to-sell assets – but most of the time the ice-cream shop is open, the queue moves along, and you get exactly what you paid for.

Investing is simple and can be pretty cost effective – as long as you watch out for fees, and invest inside an ISA or SIPP.

In short: mutual funds are sort of like the slow cooker of investing – set it, forget it, and let everyone else fuss over the seasoning.

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