ETFs vs Mutual Funds: The Basics
Exchange-Traded Funds (ETFs) and mutual funds both pool money from investors to buy a diversified basket of assets. However, they differ in how they're traded, priced, and managed — and these differences can significantly impact your returns over time.
Understanding which vehicle suits your investment style and goals is essential for building a successful portfolio as a UK investor.
What Is an ETF?
An ETF is a fund that trades on a stock exchange, just like individual shares. You can buy and sell ETFs throughout the trading day at market prices. Most ETFs passively track an index — like the FTSE 100, S&P 500, or a bond index — meaning they aim to replicate the performance of that index rather than beat it.
Key characteristics of ETFs:
- Trade on stock exchanges throughout the day
- Prices fluctuate in real-time based on supply and demand
- Typically passively managed with low fees (0.03%-0.50% per year)
- Minimum investment is just the price of one share (often £5-£100)
- Tax-efficient structure — fewer taxable events for investors
What Is a Mutual Fund?
A mutual fund (called an OEIC or unit trust in the UK) is priced once per day, usually at noon. You buy and sell at the Net Asset Value (NAV) calculated at that point. Many mutual funds are actively managed, meaning a fund manager selects investments with the aim of outperforming a benchmark.
Key characteristics of mutual funds:
- Priced once daily — you don't know the exact price when you place your order
- Can be actively or passively managed
- Higher fees for active funds (0.50%-1.50% per year), lower for passive trackers
- Often have minimum investments of £100-£1,000
- Available directly from fund companies or through platforms
Fees Comparison
Fees are one of the most significant differences and can dramatically affect long-term returns:
- ETFs — Average ongoing charge of 0.10%-0.30% for broad market trackers. You also pay trading commissions (though many UK platforms now offer commission-free ETF trading) and the bid-ask spread.
- Active mutual funds — Average ongoing charge of 0.75%-1.50%. Some also have entry/exit charges, though these are increasingly rare in the UK.
- Passive mutual funds (trackers) — Ongoing charges of 0.10%-0.30%, similar to ETFs. Vanguard and Fidelity offer particularly competitive rates in the UK.
Over 30 years, the difference between 0.10% and 1.00% in fees on a £100,000 portfolio could amount to over £60,000 in lost returns due to compounding.
Tax Efficiency
For UK investors, both ETFs and mutual funds can be held in ISAs and SIPPs, making tax treatment identical within these wrappers. Outside tax-advantaged accounts:
- Both are subject to Capital Gains Tax on profits above the annual allowance
- Dividend income from both is subject to dividend tax above the dividend allowance
- ETFs may have a slight tax advantage due to their in-kind creation/redemption process, though this matters less in the UK than in the US
Which Should You Choose?
Consider ETFs if you:
- Want the lowest possible fees
- Prefer passive, index-tracking strategies
- Want to trade during market hours
- Are comfortable placing buy/sell orders like shares
Consider mutual funds if you:
- Want access to specific actively managed strategies
- Prefer automatic investing via direct debits
- Don't need intraday trading
- Want to invest small regular amounts (some accept £25/month)
Many UK investors use both: low-cost ETFs for core holdings and selective active funds for specific sectors or strategies where active management adds value.
