Pension tax relief is the way HMRC tops up your pension contributions to reflect the income tax you have already paid (or will pay) on the money. The mechanic depends on which type of pension scheme you contribute to. Relief at source: contributions are made from net pay and the provider claims 20% basic-rate relief automatically; higher-rate and additional-rate taxpayers must claim the extra 20% or 25% themselves through Self Assessment or by writing to HMRC. Net pay arrangement: contributions are made before tax, so full relief at your marginal rate is given immediately. Salary sacrifice: contributions are made by your employer instead of paying you that salary, so they avoid both income tax and National Insurance.
This calculator works out the relief due on a given contribution, identifies what’s already been added, and shows what you can still claim back.
Why higher-rate taxpayers leave money on the table
Roughly a third of higher-rate taxpayers contributing to relief-at-source pensions don’t claim the extra relief they’re entitled to. The reason is structural: the basic-rate top-up happens automatically inside the pension, so most savers think the relief is “done”. The further 20% (for higher-rate) or 25% (for additional-rate) only comes out if the taxpayer claims it themselves through Self Assessment, by phoning HMRC, or by writing in.
For a higher-rate taxpayer contributing £10,000 net to a relief-at-source pension across the tax year:
- £10,000 leaves your bank account.
- The provider claims £2,500 from HMRC, so £12,500 sits in the pension.
- You can claim back a further £2,500 through Self Assessment as a reduction in your income tax bill.
- Net cost of the £12,500 contribution: £7,500.
Without claiming: net cost is £10,000 for £12,500 of pension. With claiming: net cost is £7,500 for the same £12,500.
For an additional-rate taxpayer (income above £125,140) the further claim is 25% rather than 20%, so the net cost on the same £10,000 net contribution drops to £6,875.
How to claim higher-rate pension tax relief
Three routes:
- Self Assessment return: enter the gross contribution (your net contribution Ã, 1.25 for relief-at-source) in the “Tax reliefs” section. HMRC reduces your tax bill or issues a refund. This is the standard route for anyone who already files Self Assessment.
- Phone HMRC: 0300 200 3300. They can adjust your tax code to give relief through PAYE, particularly useful if you don’t file Self Assessment.
- Write to HMRC: send a letter with your National Insurance number, the contribution amounts and the tax year(s). They will adjust your code or send a refund.
You can claim for up to four previous tax years. In 2026/27 that means as far back as 2022/23. Many higher-rate taxpayers discover they have years of unclaimed relief; HMRC pays interest on overpaid tax in some cases.
The £60,000 annual allowance
The annual allowance is the maximum gross contribution that can be made into all your pensions in a tax year and still attract tax relief. For 2026/27 it is £60,000. This includes employer contributions and personal contributions. If you exceed it, the excess is added to your taxable income and taxed at your marginal rate, which removes the relief on the excess (the “annual allowance charge”).
You can carry forward unused annual allowance from the previous three tax years if you were a member of a registered pension scheme in those years. So in 2026/27 you can carry forward unused allowance from 2023/24, 2024/25 and 2025/26 — potentially up to £180,000 of carry-forward on top of the current year’s £60,000, giving a maximum gross contribution of £240,000 in a single year.
The tapered annual allowance for high earners
For very high earners the £60,000 allowance tapers down. The taper applies if your “threshold income” (broadly, taxable income excluding pension contributions) exceeds £200,000 and your “adjusted income” (broadly, taxable income including all pension contributions) exceeds £260,000. The annual allowance reduces by £1 for every £2 of adjusted income above £260,000, down to a minimum of £10,000 at £360,000 of adjusted income.
The taper is one of the most complicated calculations in personal tax and the calculator on this page handles it for you. If your income is around the taper thresholds, get specific advice — small changes in salary or bonus timing can have outsized effects.
Salary sacrifice as the best relief mechanism
Salary sacrifice — where you give up a portion of salary in return for an employer pension contribution — is mechanically the most efficient pension relief. The contribution avoids income tax (relief at marginal rate, the same as relief-at-source plus the higher-rate claim), employee NI (8% or 2%) and employer NI (15%). Some employers pass the employer NI saving into the pension as well, which boosts the contribution further.
A higher-rate taxpayer giving up £10,000 of salary into a salary sacrifice pension saves £4,000 of income tax, £200 of employee NI and (if the employer passes it on) £1,500 of employer NI. Net cost: £5,800 for £10,000 in the pension, or £4,300 if the employer NI saving is included. The same £10,000 going through relief at source costs £7,500 net (after claiming).
Key takeaways
- Higher-rate taxpayers in relief-at-source pensions need to claim further 20% relief themselves through Self Assessment, on top of the automatic 20% basic-rate top-up.
- Additional-rate taxpayers claim a further 25% on top of the 20% top-up, taking total relief to 45%.
- The annual allowance is £60,000 for 2026/27, with up to three years of carry-forward available.
- The tapered annual allowance reduces this for those with adjusted income over £260,000, down to a minimum of £10,000.
- Salary sacrifice is mechanically the most efficient pension relief and avoids both income tax and NI.
Frequently asked questions
How do I know if my pension is relief at source? Most personal pensions, SIPPs and group personal pensions operate relief at source. Most occupational defined benefit and many occupational defined contribution schemes operate net pay. Your scheme administrator can confirm. The clue is in your payslip: if the pension comes off before tax is calculated, it’s net pay or salary sacrifice; if the pension comes off after tax and NI, it’s relief at source.
Can I claim higher-rate relief for previous years? Yes, up to four prior tax years. In 2026/27 you can claim for 2022/23, 2023/24, 2024/25 and 2025/26 in addition to 2026/27 itself. Use Self Assessment if you filed for those years; write to HMRC if you didn’t.
Does pension tax relief stop when I’m 75? Yes. You can contribute beyond age 75 but you don’t get tax relief on contributions made after your 75th birthday. The £60,000 annual allowance also stops applying.
What if I’m self-employed? Self-employed people contribute to personal pensions on a relief-at-source basis. The provider claims 20% basic-rate relief automatically. If you’re a higher-rate taxpayer through your self-employed earnings, claim the further 20% through Self Assessment in the same way. There’s no employer NI saving available because you’re not an employee.