ETFs — Exchange-Traded Funds — are investment funds that trade on a stock exchange exactly like shares. When you buy one unit of a FTSE 100 ETF, you instantly own a tiny slice of all 100 companies in the index. They are the single most accessible way for most individual investors to achieve broad diversification at very low cost, and buying one is simpler than most people assume.
Step 1: Open an investment account
To buy an ETF you need a brokerage account — an account with a platform that allows you to buy and sell investments. In the UK the most tax-efficient option is a Stocks and Shares ISA, which lets you invest up to £20,000 per year with zero tax on dividends or capital gains inside the wrapper. Popular UK platforms include Vanguard, Hargreaves Lansdown, AJ Bell, Interactive Investor, and Trading 212. Opening an account takes 10–20 minutes online and requires photo ID.
If you already have a pension through your employer, you may be able to invest in ETFs through that — check your pension provider's investment options.
Step 2: Choose the right ETF
There are thousands of ETFs available, but for most beginner investors the choice comes down to a handful of decisions. First, decide what you want to track: the UK market (FTSE 100 or FTSE All-Share), global stocks (MSCI World, FTSE All-World), or a specific region or sector.
Then check three numbers: the Total Expense Ratio (TER) — the annual fee deducted from the fund, expressed as a percentage. For index-tracking ETFs, this should be under 0.20%; many are as low as 0.07%. The bid-ask spread — the gap between the buy price and sell price, which is an implicit transaction cost. And the AUM (assets under management) — larger funds are more liquid and less likely to close.
Also decide between accumulating (dividends automatically reinvested — better for long-term growth inside an ISA) and distributing (dividends paid out as cash — better for income investors). Popular choices for UK investors include VWRL (Vanguard FTSE All-World, distributing), VWRP (accumulating version), and ISF (iShares FTSE 100).
Buying an ETF is like buying a single ticket to see every act at a festival simultaneously, rather than queuing to choose one band at a time. For the price of one share, you get exposure to hundreds or thousands of companies — and if one performer cancels, the festival still goes on.
Step 3: Place your order
Search for the ETF by its ticker symbol (e.g. VWRL, ISF, CSPX). You will see a current price, bid, and ask. A market order executes immediately at whatever price is available — fine for liquid ETFs during exchange hours. A limit order lets you specify the maximum price you will pay — useful in volatile conditions or for illiquid ETFs.
Enter how many units (or in some platforms, how much money) you want to invest, confirm the order, and you are done. Settlement typically takes two business days (T+2), after which the ETF units appear in your account. Most platforms show the order confirmed immediately, and you can see your holding update within the trading day.