Millions in Pension Tax Relief Goes Unclaimed Every Year — Is Some of It Yours?

Every year, millions of pounds in pension tax relief goes unclaimed by UK taxpayers. If you pay income tax at the higher or additional rate, there's a good chance some of that money belongs to you — and you need to actively claim it.

Here's everything you need to know about pension tax relief, who needs to claim, and how to do it.

What is pension tax relief?

Pension tax relief is the government's way of topping up your pension contributions by returning the income tax you've already paid on that money. In effect, it means your pension contributions cost you less than the amount that actually goes into your pot.

Basic rate taxpayers (20%): Your pension provider automatically claims 20% tax relief and adds it to your pension. Every £80 you contribute becomes £100 in your pension.

Higher rate taxpayers (40%): You get the same automatic 20% top-up, but you're entitled to an additional 20% on top — bringing your effective cost down to £60 for every £100 in your pension. You need to claim this extra 20% yourself.

Additional rate taxpayers (45%): You're entitled to an extra 25% on top of the automatic 20%. Again, you need to claim this yourself.

Why is so much tax relief unclaimed?

The problem is straightforward: most higher and additional-rate taxpayers don't realise they need to claim the extra relief themselves. The 20% basic rate is added automatically by your pension provider — but anything above that requires action from you.

It's estimated that higher-rate taxpayers could be missing out on additional pension wealth worth £97,000 over a career by not claiming and reinvesting that extra tax relief.

Many people simply don't know they need to claim, particularly if they've never filed a self-assessment tax return.

Do you need to claim?

Whether you need to claim depends on the type of pension arrangement you're in.

Net pay arrangement

Your contributions are deducted from your salary before income tax is calculated. You automatically get full tax relief at your marginal rate — no claim needed. This is common in many workplace pension schemes.

Relief at source

Your contributions are deducted from your salary after tax. Your provider claims 20% basic rate relief automatically. If you pay tax above the basic rate, you need to claim the additional relief yourself.

How to check which you're in: Look at your payslip. If your pension contribution is deducted before income tax is calculated, you're likely in a net pay arrangement. If it's deducted after tax, you're in relief at source. You can also check with your employer or pension provider.

How to claim your extra tax relief

Option 1 — Self-assessment tax return

If you already complete a self-assessment return, simply include your pension contributions in the relevant section. HMRC will calculate the additional relief and either reduce your tax bill or issue a refund.

Option 2 — Contact HMRC directly

If you don't file a self-assessment return, you can contact HMRC directly by phone or letter. They can adjust your tax code to give you the relief going forward, or issue a refund for previous years.

Option 3 — Claim online

You can claim pension tax relief directly via your HMRC online account at GOV.UK.

Can you claim for previous years?

Yes — you can claim back pension tax relief for the last four tax years. If you've been a higher or additional-rate taxpayer and haven't been claiming, you could be owed a significant sum.

For example, if you've been contributing £500/month to a relief-at-source pension as a higher-rate taxpayer for four years without claiming:

That's £4,800 you could be owed — money you could pocket or reinvest into your pension.

How much tax relief can you get?

Tax relief is available on pension contributions up to the annual allowance of £60,000 per tax year (2025/26), subject to two important limits:

• You can only claim relief on contributions up to 100% of your UK earnings in that tax year
• You must be under age 75 to receive tax relief
• If you earn under £3,600, you can still contribute up to £2,880 and receive tax relief (bringing the total to £3,600)

Salary sacrifice vs relief at source

If you're a higher or additional-rate taxpayer, salary sacrifice is generally more efficient than relief at source — because you get full tax relief and National Insurance savings automatically, with no need to claim anything back.

Next steps

1. Check your payslip — identify whether you're in a net pay or relief at source arrangement
2. Check your tax rate — if you pay 40% or 45%, you're likely owed extra relief
3. Review the last four years — calculate how much you may have missed
4. Claim via self-assessment or HMRC — don't leave money on the table
5. Consider salary sacrifice — if your employer offers it, it's the most efficient way to contribute going forward

Summary

• Basic-rate taxpayers get 20% relief automatically — no action needed
• Higher-rate taxpayers are owed an extra 20% and must claim it themselves
• Additional-rate taxpayers are owed an extra 25% and must claim it themselves
• You can claim back up to four previous tax years
• Salary sacrifice gives full relief automatically, plus NI savings — no claiming required
• The annual allowance is £60,000 for 2025/26

This article is for general information only and should not be taken as financial advice. A pension is a long-term investment that you cannot normally access until age 55 (rising to 57 from April 2028). Its value can go down as well as up and could be worth less than was paid in. Tax rules may change. Your personal circumstances, including where you live in the UK, will affect the tax you pay.