When you’re investing for retirement, the wrapper (an ISA or SIPP) shelters your money from tax — but you still choose what to hold inside it. Two of the most common building blocks are exchange-traded funds (ETFs) and traditional funds. Here’s how they differ.
What they are
ETFs are investment funds that trade on a stock exchange like a share, usually tracking an index or basket of assets, with a price that moves in real time through the day. Traditional funds (unit trusts and OEICs in the UK) pool investors’ money into a diversified portfolio and are priced once a day after the market closes.
The key differences
- Trading — ETFs trade any time the market is open; funds are bought and sold once a day at the closing price.
- Minimum investment — an ETF can cost as little as one share; some funds set higher minimums.
- Cost — passive ETFs often have very low ongoing charges (roughly 0.05–0.3%); actively managed funds tend to cost more (often 0.5–1.5%). These are broad ranges — always check the specific fund.
- Management style — ETFs are mostly passive index trackers; funds come in both active and passive flavours.
- Dealing — buying an ETF may incur a dealing charge on some platforms, whereas fund dealing is often free.
Inside an ISA or SIPP
Both ETFs and funds can be held in an ISA or SIPP, with the same tax advantages. In an ISA, gains, dividends and interest are tax-free, and you can pay in up to £20,000 in 2026/27. In a SIPP, contributions get tax relief and investments grow free of UK income and capital gains tax until you draw them, when they’re taxed as income.
Which fits your savings?
For long-term, buy-and-hold retirement saving, low-cost passive ETFs (or low-cost index funds) often appeal because fees compound over decades. Actively managed funds aim to beat the market and may suit those who want that approach, accepting higher costs and the risk of underperformance. Most UK platforms offer both, though platform fees and dealing costs vary. This is general information, not a recommendation of any specific investment.