ETFs vs Mutual Funds — What Is the Difference?

Two ways to own a basket of investments — which one makes sense for you

6 min read Beginner

"ETFs and mutual funds both let you own a diversified basket of investments. The differences — in cost, tax efficiency, minimum investment, and trading flexibility — determine which one suits your situation."

For educational purposes only. Nothing in this chapter is financial advice. All figures are illustrative examples. Tax rules, account types, contribution limits, and regulations differ by country and change over time. Always verify current rules with official government sources or a qualified financial adviser before making any investment decisions.

Structure Differences

Both ETFs and mutual funds pool investor money to buy a collection of assets — stocks, bonds, or both. The key difference is how they are structured and how you buy and sell them.

A mutual fund (called a unit trust or OEIC in the UK) is priced once per day, after the market closes. When you place an order to buy or sell, it executes at the next day's calculated price, called the Net Asset Value (NAV). You do not know the exact price until after the transaction is done.

An ETF (Exchange-Traded Fund) is listed on a stock exchange and trades throughout the day, just like a share. The price moves in real time. You see the price before you buy, and the transaction executes immediately during market hours. You can set limit orders, stop orders, and other trade instructions just as you would for an individual stock.

Costs and Minimum Investment

ETFs are generally cheaper. For an equivalent index (say, FTSE All-World), an ETF version typically has a lower ongoing charge than a mutual fund version because of structural differences in administration. The gap has narrowed as competition has increased, but ETFs still tend to have a small cost advantage.

Mutual funds often have minimum investment requirements — Vanguard's UK mutual funds require £500 to open and £100 per subsequent month. ETFs have no minimum beyond the price of one share — which for VWRL (Vanguard FTSE All-World ETF) is around £90–£100 per share as of 2025. Many platforms now offer fractional ETF investing from as little as £1.

Some platforms charge a dealing fee each time you buy an ETF (commonly £0–£11.95 per trade on UK platforms). Mutual funds on the same platforms are often free to trade. For small, frequent investments, this dealing fee can make mutual funds cheaper in total — the dealing fee on a £50 monthly ETF investment is proportionally very high.

When Each Makes Sense

ETFs are better when: you want intraday pricing and flexibility, you are making lump sum investments, you are on a platform with free ETF trading (such as Trading 212 or Freetrade), or you want access to niche markets or strategies unavailable as mutual funds.

Mutual funds are better when: you want to invest a fixed £ amount each month automatically (many platforms allow this without dealing fees for OEICs), your investment amount is below one ETF share price and fractional shares are not available, or you want the simplicity of daily-priced, full-amount orders without thinking about bid-ask spreads.

For most UK investors doing regular monthly contributions, the choice between an ETF and a mutual fund tracking the same index is a rounding error. The fund's ongoing charge and the platform's fee structure matter more than the ETF/OEIC distinction.

FAQs

Are ETFs more tax-efficient than mutual funds?

In the UK, both ETFs and OEICs/unit trusts are treated identically for tax purposes — gains above the CGT allowance are taxable, and dividends above the dividend allowance are taxable. The US tax advantage of ETFs (due to in-kind redemptions) does not apply in the UK tax system.

What is a bid-ask spread and does it matter for ETFs?

The bid-ask spread is the difference between the price buyers are willing to pay and the price sellers are asking. For large, liquid ETFs (VWRL, CSP1), the spread is typically 0.01–0.05% — negligible. For smaller, less liquid ETFs, it can be wider and adds a hidden transaction cost.

Can I hold both ETFs and mutual funds in the same ISA?

Yes. A Stocks and Shares ISA can hold ETFs, OEICs, unit trusts, individual shares, and investment trusts within the same account, subject to the platform's available products.

Which is better for a beginner?

If your platform charges dealing fees for ETFs but not for mutual funds, start with the mutual fund version of the same index — for example, the Vanguard FTSE All-World OEIC rather than the VWRL ETF. The underlying investment is nearly identical.

Key takeaways

ETFs trade on exchanges intraday at visible prices; mutual funds price once daily at NAV — the core structural difference.
ETFs generally have lower ongoing charges but may incur dealing fees per trade on some platforms.
For regular small monthly investments, mutual funds with no dealing fees may be cheaper than ETFs with dealing fees.
In the UK, both structures are taxed identically — the US tax advantage of ETFs does not apply.
The choice between an ETF and a mutual fund tracking the same index matters less than the ongoing charge and platform fee structure.