Why index funds suit pensions
Index (tracker) funds passively follow a market index rather than trying to beat it, which keeps costs low and removes manager risk. Over a multi-decade pension horizon, low fees compound powerfully — and the bulk of active funds fail to beat their benchmark after costs. A single global index fund gives instant diversification across thousands of companies worldwide.
| Index fund | Ongoing charge | Holdings | Best for |
|---|---|---|---|
| HSBC FTSE All-World Index | 0.13% | ~3,900 global companies | Lowest-cost global all-rounder |
| Fidelity Index World | 0.12% | Developed world | Cheapest developed-world tracker |
| Vanguard FTSE Global All Cap | 0.23% | ~7,000 incl. small/emerging | Widest diversification |
| L&G International Index | 0.13% | Developed ex-UK | Pairing with a UK fund |
| Vanguard FTSE Developed World | 0.14% | Developed markets | Low-cost developed exposure |
One fund or a portfolio?
For most pension investors, a single global index fund is enough. The HSBC FTSE All-World and Vanguard FTSE Global All Cap both include emerging markets, while Fidelity Index World and L&G International cover only developed markets, so you might pair them with a separate emerging-markets tracker. Whichever you choose, holding one broad fund avoids the temptation to tinker.
Cost is the one thing you control
You cannot control markets, but you can control fees. The difference between a 0.13% tracker and a 1% active fund is 0.87% a year — on a £200,000 pot growing over 25 years, that gap can cost well over £50,000 in lost compounding. This is why index funds are the default core holding for cost-aware pension investors.
Verdict
The HSBC FTSE All-World (0.13%) and Fidelity Index World (0.12%) lead on cost, while the Vanguard FTSE Global All Cap (0.23%) wins on breadth by including small caps and emerging markets. Hold them in a low-cost SIPP — compare options in our best SIPP providers guide. See the wider fund picture in our best pension UK guide and project growth with our pension calculator.