SIPP Explained — Self-Invested Personal Pension

If you've ever heard someone talk about "running my own pension" or picking individual shares inside their retirement pot, they were almost certainly talking about a self-invested personal pension, or SIPP. A SIPP is a type of personal pension that hands you the investment steering wheel: instead of choosing from a handful of ready-made funds picked by a provider, you can build your own portfolio from a much wider universe of assets, and adjust it whenever you like. SIPPs have grown hugely in popularity as low-cost investment platforms have made them cheaper and easier to use, but they're not automatically the right choice for everyone. This guide explains what a SIPP actually is, how it differs from a standard personal pension, who tends to get the most out of one, what it typically costs, and the extra risks that come with all that extra freedom.

What is a SIPP?

A SIPP is a personal pension wrapper — a tax-efficient container recognised by HMRC — that lets you choose and manage your own investments within it, rather than relying solely on a provider's default fund or a short fund range. Like any other registered pension scheme, money paid into a SIPP qualifies for tax relief, grows free of UK income tax and capital gains tax while it stays invested, and can normally be accessed from age 55 (rising to 57 from 2028), usually with up to 25% available tax-free within the standard lump sum allowance. What makes a SIPP distinctive isn't the tax treatment — that part is identical to other personal pensions — it's the breadth of what you're allowed to hold inside it. A basic personal pension or stakeholder plan typically restricts you to a short list of the provider's own funds. A SIPP opens the door to individual company shares, investment trusts, exchange-traded funds (ETFs), unit trusts and OEICs from across the market, government and corporate bonds, and in many cases commercial property, either bought directly or through a pooled vehicle. Some SIPPs are described as "full" SIPPs, aimed at holding complex or illiquid assets like direct commercial property, while "low-cost" or "platform" SIPPs focus on a simpler range of listed investments at a lower price point.

How a SIPP differs from a standard personal pension

On paper, a SIPP and a standard (or "insured") personal pension are both defined contribution arrangements: you and, where applicable, your employer pay in, tax relief is added, and the resulting pot is invested until you draw it down. The practical difference is choice. A standard personal pension usually limits you to a curated list of the provider's own investment funds — often a handful of options ranging from cautious to adventurous, sometimes with a small selection of third-party funds thrown in. That's deliberately simple: it suits people who want to make one decision (how much risk to take) and then leave the rest alone. A SIPP removes that ceiling almost entirely. Instead of ten or twenty funds, you might have access to thousands of funds, several thousand individual shares across UK and international stock exchanges, investment trusts, ETFs tracking everything from broad global indices to niche sectors, and bonds of varying credit quality and duration. You can also change your mind far more precisely — selling out of one holding and buying another the same afternoon — rather than switching between a handful of house funds. The trade-off is that nobody is filtering that universe down to a sensible shortlist for you; the responsibility for building a diversified, appropriate portfolio sits with you, or with an adviser you choose to pay for.

Who SIPPs suit

SIPPs tend to work best for confident, engaged investors who are comfortable researching investments, monitoring a portfolio over time, and making their own asset allocation decisions — or who work with a regulated financial adviser to do so on their behalf. They're also popular with people who have larger pension pots, often built up from consolidating several old workplace pensions, where the wider investment choice and typically lower percentage charges on bigger balances can make the extra complexity worthwhile. Business owners sometimes use a SIPP to hold commercial property, including premises their own company trades from, which is a well-established, if niche, use case. SIPPs suit people who want to hold a specific investment they can't get through a standard personal pension — a particular investment trust, a sector ETF, or direct shares in companies they follow closely. They suit fewer people who want a genuinely "set and forget" pension, who are just starting out with modest contributions, or who would rather not spend time reviewing their investments; for those savers, a stakeholder pension, a group personal pension, or a workplace scheme's default fund is often a better fit.

Typical SIPP costs

SIPP charges are usually built from a few layers rather than one flat fee. Most platforms charge a percentage-based or flat platform (or "wrapper") fee for administering the SIPP itself, commonly somewhere in the region of 0.20% to 0.45% a year for typical fund-based portfolios, sometimes capped at a fixed pound amount once a pot reaches a certain size. On top of that sit dealing charges — a fee each time you buy or sell a share, ETF or investment trust, often a fixed amount per trade, though many funds can be bought and sold with no separate dealing charge at all. Full SIPPs that hold commercial property or other complex assets typically carry additional set-up and ongoing administration fees, reflecting the extra legal and valuation work involved, and these can run into hundreds or even thousands of pounds a year depending on complexity. It's worth comparing the total cost of a SIPP against a standard personal pension for your own likely portfolio and trading pattern — someone who rarely trades and holds mostly funds may find a SIPP costs barely more than a standard personal pension, while someone who trades individual shares frequently will feel the dealing charges much more keenly.

Tax relief works exactly the same way

It's easy to assume a SIPP must come with different tax rules because it sounds more sophisticated, but the tax relief is identical to any other personal pension. Basic rate taxpayers get 20% relief added automatically by the provider (so an £80 contribution becomes £100 in the pension), higher and additional rate taxpayers can claim further relief through Self Assessment, and total contributions across all your pensions in a tax year are capped by the annual allowance, currently £60,000 (or 100% of your UK earnings if lower), before a tax charge applies. The money purchase annual allowance of £10,000 applies if you've already started flexibly drawing income from any defined contribution pension, including a SIPP. None of this changes because the pension happens to be self-invested — the SIPP wrapper affects what you can invest in, not how much tax relief you receive for investing in it.

Opening and consolidating pensions into a SIPP

Opening a SIPP is usually a straightforward online process with an investment platform or a dedicated SIPP provider: you complete an application, choose how you want to fund it (a lump sum, regular monthly contributions, or a transfer from an existing pension), and select your investments once the money arrives. Many people open a SIPP specifically to consolidate several old workplace pensions accumulated across different employers, bringing everything into one place that's easier to monitor and often cheaper to run than several small pots scattered across different providers. Before transferring, it's worth checking whether any existing pension has valuable guarantees attached — some older policies include guaranteed annuity rates or other features that would be lost on transfer, and for larger, more complex, or safeguarded benefits, such as a defined benefit pension, you may be legally required to take regulated financial advice before transferring at all. For straightforward defined contribution pots without special guarantees, consolidating into a SIPP is common, and can simplify both your investment strategy and your paperwork ahead of retirement.

Typical SIPP investment options

The risks of the wider investment freedom

More choice cuts both ways. A standard personal pension's limited fund range acts, in effect, as a safety net: even the most hands-off saver ends up in a reasonably diversified fund matched loosely to their risk appetite. A SIPP removes that guardrail. It's entirely possible to hold an undiversified portfolio concentrated in a handful of shares or a single sector, to trade too frequently and erode returns through charges, or simply to leave cash uninvested for long periods without realising it. Because nobody vets your choices before you make them, the quality of the outcome depends heavily on the quality of your own decisions, or those of an adviser you've engaged to make them for you. SIPPs can also, in some cases, be used to hold higher-risk or less regulated investments, and it's important to stick to mainstream, liquid holdings unless you genuinely understand what you're buying and why. None of this means SIPPs are unsuitable — millions of people use them successfully — but it does mean the responsibility genuinely sits with the account holder in a way it doesn't with a simpler personal pension. If you're not confident making these decisions yourself, take regulated financial advice, or consider whether a standard personal pension or stakeholder pension might suit you better.

SIPPs and drawdown in retirement

A SIPP doesn't stop being useful once you reach retirement age — many people keep their pension invested in a SIPP well into retirement, using flexible drawdown to take an income while the remainder stays invested. This differs from buying an annuity, which converts your pot into a guaranteed income for life in exchange for giving up the capital. With drawdown from a SIPP, you typically take up to 25% of the pot tax-free, subject to the standard lump sum allowance, and then draw taxable income as and when you choose, with the rest remaining invested and able to keep growing, though also able to fall in value. This flexibility is one of the main reasons SIPPs remain popular right through retirement, not just during the saving years, but it does mean ongoing investment decisions — and the same wider responsibility for getting them right — continue for as long as the pension stays invested. Anyone considering drawdown from a SIPP should think carefully about how much income the pot can sustainably provide, since taking out too much too quickly risks running the fund down faster than expected.

SIPPs and passing money on

One feature that draws people towards SIPPs, alongside investment choice, is how they're normally treated on death. Unlike many other assets, a SIPP usually sits outside your estate for inheritance tax purposes, because you don't legally own the underlying investments — the scheme trustees or provider hold them on your behalf and pay out at their discretion, guided by an "expression of wishes" form you complete and keep up to date. If you die before age 75, benefits can typically be passed to your chosen beneficiaries entirely tax-free, whether they take it as a lump sum or keep it invested and draw it down over time. Die at 75 or older, and beneficiaries generally pay income tax at their own marginal rate when they draw the money out, but the pot itself still usually avoids inheritance tax. This makes a SIPP a genuinely useful tool for later-life planning, not just for the original saver's own retirement income, and it's one of several reasons some people choose to draw other assets first and leave pension money largely untouched for as long as they reasonably can. Rules around pensions and inheritance tax have been subject to review and change in recent years, so it's worth checking the current position, or taking advice, if estate planning is a significant part of why you're considering a SIPP.

A worked example: SIPP charges over a year

To see how the layered charging structure adds up in practice, consider a SIPP holder with a portfolio built mostly from ETFs and investment trusts.

• 1

  Portfolio value at the start of the year: £120,000, invested across a mix of ETFs and investment trusts.

• 2

  Platform fee at 0.25% a year: roughly £300, usually collected quarterly in arrears.

• 3

  Six trades made during the year at a £10 dealing charge each: £60 in total.

• 4

  Combined annual cost: around £360, or roughly 0.3% of the pot's value.

• 5

  For comparison, a stakeholder pension charging a flat 1% would cost around £1,200 a year on the same pot size, though with a far narrower fund choice.