Written by PensionTaxReliefCalculator Editorial. Reviewed against official UK guidance. Methodology
If you pay 40% income tax, your pension provider only claims 20% relief automatically. You are owed an extra 20%, and claiming it is simpler than most people think. Here is the complete process.
The UK pension system operates on a crucial but poorly understood two-step process for higher-rate taxpayers. When you contribute to a personal pension or SIPP under relief at source, which covers virtually all SIPPs, personal pensions and many workplace schemes, your pension provider claims 20% basic-rate tax relief from HMRC automatically. This top-up happens within a few weeks of your contribution and appears in your pension pot without you doing anything.
The problem is that 20% is only half the relief to which a higher-rate taxpayer is entitled. If you pay 40% income tax on any part of your income, your total pension relief entitlement is 40%, but the automatic process delivers only 20%. The remaining 20% must be actively claimed, either through a Self Assessment tax return or by calling HMRC. Many higher-rate taxpayers simply do not know this, and HMRC does not proactively send reminders. The result: billions of pounds of unclaimed relief sitting uncollected each year.
The 2026/27 higher-rate threshold is £50,270. If your total income (employment, self-employment, rental, dividends where applicable) exceeds this figure, you pay 40% on the portion above it. Any pension contributions made during the year that fall within the higher-rate band attract 40% total relief, not 20%. This guide explains exactly how to claim the full amount.
Let us work through the mechanics precisely. You pay £8,000 net into your SIPP. Your provider claims 20% basic-rate relief from HMRC: the gross-up calculation is £8,000 ÷ 0.8 = £10,000. So £10,000 goes into your pension pot. At this point, HMRC has given you £2,000 of relief. You are entitled to 40% of £10,000 = £4,000 total. The gap: £2,000 extra you still need to claim.
The mechanism by which HMRC delivers the extra relief is elegant: rather than issuing a cheque for £2,000, HMRC extends your basic-rate tax band by £10,000. Normally, income above £50,270 is taxed at 40%. By extending the basic-rate band to £60,270, HMRC ensures that £10,000 of income that would have been taxed at 40% is instead taxed at 20%, a saving of 20% × £10,000 = £2,000. This happens via your Self Assessment return, which reduces your tax liability by that amount or generates a repayment.
For an additional-rate (45%) taxpayer with income above £125,140, the same logic applies but the extra claim is 25%, the gap between the 45% total entitlement and the 20% already claimed. On a £10,000 gross contribution, the extra claim via Self Assessment is 25% × £10,000 = £2,500.
Step 1: Register for Self Assessment if you are not already registered. HMRC requires Self Assessment for anyone with total income above £100,000, or who has untaxed income above certain thresholds. Higher-rate taxpayers not already registered should notify HMRC of their need to file, you can do this through your Government Gateway account. Penalties apply for late registration.
Step 2: Get your annual pension statement from your provider. This will show the total gross contributions to your pension in the tax year, that is, the amount actually in your pension including the provider's top-up. This is the figure you enter on your SA return, not the net amount you paid. Most SIPP providers send an annual statement in April or May. You can also usually find this figure in your online portal under the relevant tax year.
Step 3: File your Self Assessment tax return for 2026/27 (online, by 31 January 2028). On the SA100 form, navigate to the section headed 'Paying into pension schemes where the pension provider claims tax relief at the basic rate (also known as relief at source)'. Enter the total gross contributions for the year in the relevant box. HMRC's calculation engine automatically extends your basic-rate band and reduces your tax liability accordingly.
Step 4: The relief arrives as either a reduction in your January payment, a credit applied to your tax account, or a direct repayment, depending on whether you have already paid a tax bill. If you pay tax through PAYE alongside your self-assessment, HMRC may also spread future relief through your tax code.
If you are employed and pay tax through PAYE, and you do not otherwise need to file a Self Assessment return, you can claim higher-rate pension relief by contacting HMRC directly. Call the income tax helpline (0300 200 3300) or use the Government Gateway online service and request a PAYE tax code adjustment. HMRC will revise your code to include the pension relief, and your employer will deduct less income tax from your pay going forward.
This method spreads relief across the remaining months of the tax year rather than delivering it in a lump sum. The practical implication is that if you start contributing in April, you will receive a full year's spread of relief; if you start in November, the relief will be spread across only a few months before the year end. You can also request code adjustments for prior-year contributions, or register for Self Assessment retrospectively for the years you have missed.
HMRC allows back-claims for up to four previous tax years. As of May 2026, this means you can still claim relief for 2022/23, 2023/24, 2024/25 and 2025/26. For each year, you need the gross pension contribution figure from your provider's records. You can either file a late Self Assessment return (if you are required to self-assess) or write a letter to HMRC requesting a tax repayment for the specific year.
For a higher-rate taxpayer who has been contributing £10,000 gross per year to a SIPP without claiming the extra 20% for the past four years, the unclaimed relief totals: 20% × £10,000 × 4 = £8,000. That is £8,000 sitting uncollected that can be reclaimed simply by submitting four years of gross contribution data to HMRC. Given that this exercise typically takes less than an hour, the hourly rate of return is exceptional.
Important: if your marginal rate varied across years, for example if you crossed the £50,270 threshold partway through a year or received a large bonus in a specific year, the calculation for that year needs to be done carefully. Only contributions that fall within the higher-rate band attract 40% relief; contributions against basic-rate income only get 20%, which the provider has already claimed.
If your workplace pension operates under a net pay arrangement (NPA) rather than relief at source, this entire process does not apply to you. Under NPA, your pension contribution is deducted from your gross salary before income tax is calculated. Your employer's payroll software automatically grants full relief at your marginal rate, 40% for a higher-rate taxpayer, without any Self Assessment claim. You do not need to do anything extra to receive the correct relief.
The way to tell which system your scheme uses: under relief at source, the contribution comes from your post-tax pay and your take-home pay is lower by the net amount. Under net pay, the contribution comes off gross salary and your take-home is lower by the net-of-tax amount (60p per £1 for a 40% taxpayer). Check your payslip or ask your HR department if you are unsure. Salary sacrifice schemes similarly do not require a Self Assessment claim for the pension relief component.
Example 1, James, salaried employee, income £65,000: James pays into a SIPP under relief at source. He contributes £10,000 net per year. Provider tops up to £12,500 gross. Total 40% entitlement: £5,000. Provider has claimed £2,500. Extra claim via SA or PAYE code: £2,500. Annual benefit of claiming: £2,500 cash or tax reduction.
Example 2, Rachel, self-employed, trading profit £75,000: Rachel contributes £15,000 net to her SIPP. Provider tops up to £18,750 gross. Total 40% entitlement on the higher-rate portion: 40% × £18,750 = £7,500. Provider claimed £3,750. Extra SA claim: £3,750. Four-year back-claim if she has been contributing for four years and never claimed: £15,000.
Example 3, David, income £130,000, additional-rate taxpayer: David contributes £20,000 net. Provider tops up to £25,000 gross. Total 45% entitlement: £11,250. Provider claimed £5,000. Extra SA claim: £6,250 (25% × £25,000). Net cost of a £25,000 pension contribution: £20,000 − £6,250 = £13,750. Effective cost: 55p per £1 in pension.
Check your payslip. Under relief at source, the pension contribution appears after-tax, your take-home is reduced by the full contribution amount. Under net pay, the contribution is deducted before tax, your take-home is reduced by less than the contribution (the net-of-tax amount). You can also ask your HR department or look at your pension provider's documentation.
If you are not otherwise required to file, you can claim via a PAYE code adjustment instead, contact HMRC. However, if your income is over £100,000, Self Assessment is mandatory regardless, and the pension relief claim is straightforward to include in your SA return.
Four years. As of the 2026/27 tax year, you can claim back to 2022/23. After 31 January 2027, the 2022/23 window closes permanently.
Not automatically. HMRC does not know about your private pension contributions unless you tell them. You must either file a Self Assessment return or proactively contact HMRC to request a code adjustment.