What is a SIPP? Personal pensions explained

How a SIPP works in the UK: relief at source with a worked example, higher rate relief, the annual allowance, pension access age and the tax-free lump sum.

Part of the Investment Accounts and Tax track on Agenticks. About 12 minutes, written for a beginner reader.

Read first: What is an ISA? Stocks and shares ISAs explained.

Last reviewed 2026-11-08.

Risk notice. Tax rules depend on where you live and on your own circumstances, and they change. This lesson explains how the rules work in general; the official source linked below is the final word.

Key takeaways

• A SIPP is a UK personal pension where you choose the investments yourself. Contributions get tax relief, and the money is generally locked until the normal minimum pension age.
• With relief at source, you pay in from taxed income and the provider adds basic rate relief, so £800 paid in becomes £1,000 in the pension.
• Higher and additional rate taxpayers can claim extra relief through Self Assessment. Relief is limited by your earnings and by the annual allowance.
• You can usually take up to a quarter of a pension tax-free, up to an overall cash limit, and the rest is taxed as income.
• The normal minimum pension age is scheduled to rise on 6 April 2028. Both ages are in the table in this lesson.

This lesson applies to the United Kingdom. Pension tax rules are set by HMRC, and how they apply depends on your income, your other pensions and your age. The rules also change, so GOV.UK is the final word. A personal pension is a pension that you arrange yourself, rather than one an employer sets up. A self-invested personal pension, or SIPP, is a type of personal pension that lets you control the specific investments that make up your pension fund. In tax terms, it follows the tax-deferred design from tax-advantaged accounts explained: tax relief on the way in, growth without UK income or capital gains tax inside, and income tax on most of what comes out. The trade-off against an ISA is access. ISA money can come out at any time. Pension money generally cannot come out until the normal minimum pension age, in exchange for the tax relief.

Relief makes every contribution bigger

Tax relief means some of the income tax you paid on your earnings is added back into your pension. Before any investment growth, the pension starts with more than you paid in.

Relief at source. Most SIPPs give relief this way. You pay in from income that has already been taxed, and your pension provider claims tax relief from the government at the basic rate and adds it to your pension pot. The basic rate is in the table below. If you pay a higher rate of tax, the provider still only claims the basic rate. You can claim more through a Self Assessment tax return: an extra 20% on contributions up to the amount of income you paid 40% tax on, and an extra 25% up to the amount of income you paid 45% tax on. These are the rates in England, Wales and Northern Ireland; Scotland has its own income tax bands. Limits on relief. You can get tax relief on contributions worth up to 100% of your annual earnings. If you have no earnings in a tax year, relief is limited to a smaller fixed amount, shown in the table. Separately, the annual allowance caps how much can be paid into your pensions in a tax year by you or anyone else, such as an employer, before a tax charge applies. You may be able to carry forward unused allowance from the previous three tax years. The allowance is reduced, or tapered, for people with very high incomes, and it falls to a lower money purchase annual allowance once you have flexibly accessed a pension, for example by taking cash out of a pension pot.

Worked example: relief at source on £800

Someone pays £800 into a SIPP from their take-home pay. The £800 is illustrative; the 20% is the basic rate relief in the table below.

Illustrative. Assumes income tax bands for England, Wales and Northern Ireland and that the person has enough earnings and annual allowance.

Self-invested personal pension (SIPP) and other UK pensions

When you can take the money. You can usually take money from a personal or workplace pension only once you reach the normal minimum pension age. The government has legislated for that age to rise from 6 April 2028. Both ages are in the table above. There are exceptions, such as retiring early because of ill health, and some people have a protected pension age from rights they held before November 2021. Members of the firefighters', police and armed forces public service schemes are not affected by the increase. The tax-free part. You can usually take up to 25% of the amount built up in any pension as a tax-free lump sum, up to an overall cash limit called the lump sum allowance. Tax is taken off the rest before you receive it. Taking a large amount in one tax year can push part of it into a higher income tax band, so how the money is drawn over time affects how much tax is paid.

Worked example: taking money from a £100,000 pension

Someone has £100,000 in a pension and reaches the age when they can take it. The pot size is illustrative and well below the lump sum allowance.

Illustrative. Tax depends on your total income in each year and the rules in force when you take the money.

Put the steps of relief at source in order, for a higher rate taxpayer.

1. Pay £800 into the SIPP from taxed pay
2. The provider claims £200 basic rate relief
3. £1,000 is invested in the pension
4. Claim the extra relief on a Self Assessment return

The price of relief is time

A pension usually gives more tax help than an ISA, and it asks for something in return: the money is out of reach for years or decades. Investments inside can still fall in value, and the rules that apply when you finally take the money may not be the rules today.

For the flexible, tax-free side of UK saving, read what is an ISA. The long holding periods in a pension are where compounding does most of its work, explained in compounding and time. Workplace pensions often add employer contributions, which a personal pension on its own does not, so it is worth knowing what any workplace scheme offers as well.

You understand how a SIPP works

You can now explain relief at source, how higher rate relief is claimed, the annual allowance, when pension money can be taken and how the tax-free part works.

Check your understanding

With relief at source, you pay £800 into your SIPP from taxed income. What ends up in the pension?

£1,000, because the provider claims £200 of basic rate relief from the government. Basic rate relief turns an £800 payment into a £1,000 contribution.

How does a higher rate taxpayer get relief above the basic rate on a relief at source pension?

By claiming it through a Self Assessment tax return. GOV.UK describes claiming an extra 20% on contributions up to the amount of income taxed at 40%.

What usually happens to the money taken from a pension beyond the tax-free part?

It is taxed as income, and a large amount in one year can push you into a higher tax band. Tax is taken off the remaining amount before you receive it.

What triggers the lower money purchase annual allowance?

Flexibly accessing a pension, for example by taking cash from a pension pot or a drawdown fund. After that, contributions to defined contribution pensions above the lower limit can be taxed.

Common questions

How does tax relief on a SIPP work?

With relief at source, you pay in from taxed income and your provider claims basic rate tax relief from the government and adds it to your pension. Higher and additional rate taxpayers can claim extra relief through Self Assessment.

When can I take money out of a SIPP?

Usually not before the normal minimum pension age, unless you retire early because of ill health or have a protected pension age. The government has legislated for the age to rise from 6 April 2028. The current and future ages are on GOV.UK.

How much of my pension can I take tax-free?

GOV.UK says you can usually take up to 25% of the amount built up in any pension as a tax-free lump sum, up to an overall limit called the lump sum allowance. Tax is taken off the rest before you receive it.

Terms defined in this lesson

• SIPP (Self-invested personal pension)
• Relief at source
• Pension annual allowance
• Money purchase annual allowance
• Tax-free lump sum
• Tax-deferred
• ISA (Individual Savings Account)

Continue

• Previous: What is an ISA? Stocks and shares ISAs explained
• Next: The 401(k) explained
• Tax-advantaged accounts explained
• Compounding and why time horizon matters
• RRSP explained
• TFSA vs RRSP compared
• Investment Accounts and Tax track
• All Agenticks lessons
• Trading glossary

Sources

• GOV.UK. (n.d.). Personal pensions. HM Government.
• GOV.UK. (n.d.). Tax on your private pension contributions: Tax relief. HM Government.
• GOV.UK. (n.d.). Tax on your private pension contributions: Annual allowance. HM Government.
• HM Treasury & HM Revenue & Customs. (2021, November 4). Increasing normal minimum pension age. GOV.UK.
• GOV.UK. (n.d.). Tax when you get a pension: What's tax-free. HM Government.

Written and reviewed by the Agenticks Learn editorial team. How we write and check lessons.

Agenticks Learn is general education. It is not financial, investment, tax or legal advice, it does not take your situation into account, and nothing on it is a recommendation to buy, sell or hold any security or to open any account. Examples use illustrative numbers. Investing involves risk, including losing money you put in, and past performance does not predict future results. Tax rules and limits change; the official sources linked in each lesson are the final word.