Best Broker for a SIPP: Low-Cost ETF Pension Investing (2026)

A SIPP, or self-invested personal pension, lets you build your own pension from low-cost funds and ETFs, with the tax relief that makes pensions so powerful. Because a pension is long-term and tends to grow large, the platform you choose matters even more here than with an ISA. A small annual percentage fee on a six-figure pot, compounding for decades, is a serious drag. Here’s how to choose.

What matters when choosing a SIPP

• The fee model, above all. Pensions get big and are held for a long time, so the difference between a percentage fee and a flat fee can be enormous over a working life. Percentage platforms are fine for small pots; flat-fee platforms usually win once the balance grows. See broker fees explained.
• What you want to hold. ETF-only investors can use the very cheapest platforms. Share pickers and fund investors need broader access.
• Dealing and drawdown costs. Check both the cost of investing now and the cost of taking an income later, since some providers charge for drawdown.
• Reliability. A pension provider is a long-term relationship, so stability and service matter.

Providers by what you need

A starting point, not a verdict. Pension platform pricing changes, so check current fees and drawdown charges before committing.

• Cheapest for ETF investors: ETF-focused platforms like InvestEngine have pushed SIPP costs right down, ideal if you only want ETFs.
• Best for shares and range: AJ Bell offers wide access with capped share charges, a solid all-round pension home.
• Best flat fee for larger pots: interactive investor’s fixed monthly fee tends to win clearly once your pension is large, since the cost doesn’t rise with your balance.
• Best for hands-off index investing: Vanguard, if you’re happy with its own funds and ETFs.
• Low-cost with shares: Freetrade and similar app-based providers can be cheap, though watch FX on non-sterling assets.

The tax relief, briefly

Contributions to a SIPP get tax relief at your marginal rate, which is the main reason pensions beat most other wrappers for retirement money. The trade-off is that the money is locked away until the minimum pension age. It’s worth understanding how relief and access work for your situation before you commit serious money.

ISA or SIPP first?

Many people use both: a Stocks and Shares ISA for flexible, accessible investing, and a SIPP for retirement money with tax relief. Which to prioritise depends on your timeline and tax position, and it’s a question worth thinking through rather than defaulting.

The bottom line

For most pension investors, the best SIPP is the lowest-cost properly regulated one that holds what you want, with the fee model matched to your pot size. Get that right early and the savings compound for decades. Compare UK pension platforms side by side on Brokerlens.

Educational information, not personal advice and not pension advice. Fees, tax relief and pension rules change and depend on your circumstances, so always check the current position. We may earn a commission if you open an account through our links, which never affects which providers we recommend.