Written by PensionTaxReliefCalculator Editorial. Reviewed against official UK guidance. Methodology
How relief at source works in a SIPP, how higher-rate taxpayers claim additional relief via Self Assessment, key differences from workplace pensions, and how drawdown is taxed.
All SIPPs operate under the relief at source (RaS) method. When you contribute to your SIPP, you pay 80% of the gross amount, the provider automatically claims 20% basic-rate tax relief from HMRC and adds it to your pension pot. So if you pay £800, your SIPP receives £1,000. The provider handles this claim on your behalf; you do not need to do anything to receive the 20% basic-rate top-up.
This automatic 20% top-up applies to all SIPP contributions, regardless of whether you actually pay income tax. A non-taxpayer or low earner below the personal allowance still receives the 20% top-up on contributions up to £3,600 gross per year (£2,880 net). For contributions above that level, relevant UK earnings are required. HMRC has the right to reclaim relief if your earnings are insufficient, but in practice this is rarely pursued for modest contributions.
A SIPP is a personal pension, you set it up directly with a provider, you choose the investments (from the provider's available range), and you pay all charges. The investment universe in a SIPP is typically much broader than a workplace scheme: you can hold listed shares, ETFs, bonds, commercial property (in some SIPPs) and a wide range of funds. Charges vary significantly between providers, from flat fees (better for large pots) to percentage-based fees (cheaper initially but expensive as the pot grows).
Workplace pensions are operated by your employer. Under auto-enrolment, employers must contribute at least 3% of qualifying earnings (employees at least 5%), a minimum 8% total. Many employers offer additional matching. Workplace pensions may use net pay arrangement or salary sacrifice rather than relief at source, which affects the administration. The investment options in workplace schemes are typically more limited than in a SIPP, but the employer contribution is a significant and often irreplaceable benefit that a self-directed SIPP cannot replicate.
If you pay income tax at 40% (higher rate) or 45% (additional rate), you are entitled to relief above the automatic 20% that the provider claims. To get this additional relief, you must file a Self Assessment tax return and enter your gross SIPP contributions for the year. HMRC then extends the basic-rate band by the gross contribution amount, effectively taxing less of your income at 40% or 45%, and refunds or reduces your tax liability accordingly.
For a higher-rate taxpayer who contributes £10,000 net to a SIPP: the provider claims £2,500 basic-rate relief, giving £12,500 gross in the pension. The higher-rate taxpayer then claims an additional 20% on £12,500 via Self Assessment = £2,500. Total relief: £5,000 (40% of £12,500). Net cost: £10,000 − £2,500 = £7,500. For an additional-rate (45%) taxpayer: additional claim is 25% on £12,500 = £3,125. Total relief: £5,625 (45%). Net cost: £10,000 − £3,125 = £6,875.
When you access your SIPP in retirement, you are entitled to take 25% of the fund as a tax-free pension commencement lump sum (PCLS), subject to the lump sum allowance (£268,275 since the lifetime allowance was abolished in April 2024). The remaining 75% is drawn as taxable income, charged at your marginal rate when withdrawn. You can choose how much to draw each year, giving flexibility to manage your tax position in retirement.
Most people draw from their SIPP gradually in drawdown, taking enough to use up the personal allowance each year tax-free and drawing modest additional amounts at basic rate. Timing drawdown thoughtfully, avoiding taking large sums in years when other income is high, can reduce the overall tax paid in retirement substantially. For those with defined benefit pensions and state pension that already fill or approach the personal allowance, SIPP drawdown in excess of this will be fully taxable at the relevant rate.
You pay 80p and your SIPP receives £1 (the provider claims 20% from HMRC). A higher-rate taxpayer who then claims additional relief via Self Assessment effectively pays 60p per £1 in the pension.
Yes. Contributions to both count towards your combined annual allowance of £60,000. Many people contribute to both, using the workplace pension for employer matching and the SIPP for additional contributions with wider investment choice.
Most providers have a minimum, often £50–£100 per month or a lump sum minimum. There is no HMRC minimum, though you need relevant UK earnings to contribute more than £3,600 gross per year.