What Is a SIPP? A Simple Explanation

SIPP stands for self-invested personal pension. It is a type of defined-contribution pension that normally gives a wider investment choice than a standard personal pension. You choose the provider and can select investments yourself, use a ready-made option where offered, or pay a regulated adviser to help.

The word “self-invested” does not mean you must trade individual shares. Many people use a SIPP to hold one or more diversified funds. The important difference is control and choice: the pension wrapper provides the tax treatment, while the investments, fees and decisions inside it determine what the pot may become.

How a SIPP works

1. You open a SIPP with a provider authorised to offer the service.
2. You, an employer or another person pays money in, subject to the scheme's rules and pension tax limits.
3. The provider normally claims basic-rate tax relief on eligible personal contributions under “relief at source”.
4. The money is invested in the funds, shares or other permitted investments available through that provider.
5. The pot rises or falls with contributions, investment performance and charges.
6. You normally cannot access it until the minimum pension age, apart from limited exceptions.

A SIPP does not promise a particular retirement income. MoneyHelper classifies it as a defined-contribution pension, so the amount available depends on how much is paid in, investment performance, provider and investment charges, and how and when benefits are taken.

SIPP vs workplace pension vs standard personal pension

Feature	Workplace pension	Standard personal pension	SIPP
Who opens it?	Your employer arranges the scheme	You normally choose the provider	You normally choose the provider
Employer contribution	Usually available and often the biggest advantage	Possible if the provider accepts it	Possible if the provider accepts it
Investment choice	Usually a selected scheme range and default fund	Usually a provider fund range or ready-made options	Often wider: funds, shares, ETFs, bonds and, with some full SIPPs, commercial property
Decision burden	A default normally exists	Low to moderate	Moderate to high unless using a ready-made or advised option
Charges	Scheme-specific and can be subsidised or negotiated	Often bundled or percentage-based	Can combine platform, fixed, fund and dealing charges

If an employer offers a workplace pension, MoneyHelper says paying into it is usually better than replacing it with a SIPP because the workplace scheme normally includes employer contributions and may have lower charges. A SIPP can run alongside a workplace pension when the extra choice has a clear purpose; it is not a reason to give up employer money.

What can a SIPP invest in?

The exact range belongs to the provider, not the word SIPP. Depending on the service it can include:

• managed funds and index funds;
• exchange-traded funds (ETFs) and investment trusts;
• UK and overseas company shares;
• government and corporate bonds; and
• commercial property or land through some full SIPP arrangements.

A low-cost online SIPP may deliberately offer fewer investments than a full SIPP. More choice is not automatically better. A larger menu can make diversification, record keeping and fee comparison harder, while concentrated or speculative holdings can expose a retirement pot to losses it cannot recover from quickly.

SIPP tax relief and the annual allowance

Most personal SIPP contributions use relief at source. A provider claims basic-rate relief, so an £80 net personal payment normally becomes £100 in the pension. Someone entitled to relief above the basic rate usually has to claim the extra amount from HMRC rather than expecting the provider to add it automatically.

For 2026/27, GOV.UK lists a standard pension annual allowance of £60,000 for most people. It applies across all private pensions, not once per SIPP. Employer contributions count, as can growth in a defined-benefit entitlement. A lower tapered allowance can apply to high incomes, and the money purchase annual allowance can apply after certain flexible pension withdrawals.

Tax relief on personal contributions is also limited by relevant UK earnings. A UK resident under 75 with little or no earnings can normally receive relief on up to £3,600 gross: £2,880 paid personally plus £720 basic-rate relief. These rules are separate from what a provider will accept and can be more complex for employers, company directors and people who have flexibly accessed pensions.

When can money be taken from a SIPP?

The normal minimum pension age is currently 55 and is due to rise to 57 on 6 April 2028 for most people. Some schemes or members have a protected pension age, and ill-health rules can allow earlier access. Do not treat a cold call or online advert offering ordinary early access as a loophole; unauthorised access can trigger heavy tax charges and is a common pension-scam warning.

At retirement, the main defined-contribution options can include leaving money invested, using drawdown, buying an annuity or taking lump sums. The common “25% tax-free” summary needs a boundary: tax-free pension cash is normally up to 25% of the amount crystallised but is also subject to the individual's available lump sum allowance. GOV.UK lists the standard lump sum allowance as £268,275 for 2026/27, unless protection or previous use changes the figure.

Every SIPP fee to put in one table

Do not compare providers using only the largest percentage on the homepage. Collect:

• percentage platform or administration charge and any cap;
• fixed monthly or annual SIPP charge;
• each fund's ongoing cost and transaction costs;
• share, ETF or fund dealing fees;
• foreign-exchange charges for overseas investments;
• drawdown, payment, transfer or closure charges;
• adviser or managed-portfolio charges; and
• cash-interest policy and any interest retained by the provider.

Use the calculator above with two providers' live tariffs. A percentage platform can be lower for a small pot while a fixed-fee platform becomes lower at a larger balance. The opposite can happen when frequent dealing or a different investment cost is included. The calculation is a cost comparison, not evidence that either investment range is suitable.

When a SIPP can make sense

• You are self-employed or want a separate personal pension and understand that no workplace employer contribution appears automatically.
• You need a particular mainstream investment that is unavailable in your current personal pension.
• You can explain your diversified investment plan and how often it needs reviewing.
• The all-in cost is competitive for your expected balance and trading pattern.
• You want to consolidate suitable defined-contribution pots after checking every guarantee, charge and protected pension age.

When a SIPP may be the wrong first move

• You would lose employer contributions by reducing or leaving a workplace pension.
• You want more choice but do not have an investment plan or the time to maintain it.
• The provider's minimum or fixed fees are expensive for a small pot.
• You are being contacted unexpectedly or pressured to use unregulated, overseas, illiquid or “guaranteed” investments.
• The money is in a defined-benefit scheme or includes safeguarded benefits that a transfer could permanently surrender.

Transferring another pension into a SIPP

A defined-contribution transfer may simplify administration, but check exit fees, investment costs, employer access, protected pension age, guaranteed annuity rates and other valuable benefits first. Compare the receiving SIPP only after documenting what the old scheme provides.

Defined-benefit transfers need much greater caution. The FCA says most consumers are not best advised to transfer out of a defined-benefit pension, which provides a guaranteed retirement income. If safeguarded benefits are worth more than £30,000, regulated transfer advice is legally required before trustees can make the transfer. Check that the adviser has the specific pension-transfer permission on the FCA Register.

A seven-step SIPP checklist

1. Use the workplace pension enough to capture the available employer contribution before comparing a separate SIPP.
2. Write down why wider investment choice is needed.
3. Choose a simple diversified investment approach before choosing a platform.
4. Compare the complete annual cost at today's pot and at a plausible larger pot.
5. Check the provider and any adviser on the FCA Register using contact details from the register.
6. Record any guarantees or protected benefits before starting a transfer.
7. Keep accessible emergency savings because pension money is normally locked away until the minimum age.

Sources checked

• MoneyHelper: SIPPs explained
• GOV.UK: pension tax relief
• GOV.UK: annual allowance
• GOV.UK: 2026/27 pension rates and lump sum allowances
• FCA: defined-benefit transfer advice
• FCA Financial Services Register

Reviewed 3 September 2026. Pension and tax rules can change and individual protections differ. This is general education, not a personal recommendation, tax advice or regulated financial advice. Investments can fall and you may get back less than is paid in.