If you haven't claimed before, you may be owed more than you think

Most higher-rate taxpayers who discover they're owed pension tax relief assume the opportunity is limited to the current year. It usually isn't.

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HMRC allows you to backdate claims by up to four complete tax years. Each year you delay, the oldest year in that window closes permanently. For someone contributing £8,000 a year to a personal pension and paying 40% tax, a four-year backdated claim could be worth around £6,400 — money that has been sitting with HMRC, unclaimed, because no one pointed out it was there.

The four-year window: what's open right now

In the 2026/27 tax year, you can claim relief for the following years. Once 5 April passes for each deadline year, that window closes permanently.

The £2,000 figures above are illustrative — based on £10,000 gross contributions at 40% higher-rate. Your actual entitlement depends on your income, pension contributions, and which portion of your income falls in the higher-rate band each year. The point is that four years of unclaimed relief adds up quickly

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Why people miss previous years

The most common story: someone has been paying into a personal pension for years, assumes their pension provider handles all the tax relief, and only discovers the extra claim exists when a colleague mentions it or a specialist spots it on a tax return.

Other common reasons:

• Income drift — frozen tax thresholds have pushed hundreds of thousands of people into higher-rate tax over the past few years without any change in their salary. People who were basic-rate taxpayers in 2021 may have crossed the 40% threshold in 2022 or 2023, without realising it changed what they were entitled to.
• Job changes — moving between employers often means moving between pension providers and sometimes between pension types. It’s easy to lose track of which years had which schemes — and whether a claim was ever made.
• Assumed complexity — the claim process sounds more complicated than it is. Many people intend to look into it and never do.

What you need to gather, year by year

To prepare a clean multi-year claim, you'll need the following for each tax year you're claiming. The good news: your NI number stays the same throughout, so that's one thing you only need once.

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If you changed pension providers during the period, you may need statements from more than one. Most providers make these available online going back several years — it's worth checking your portal before calling.

Why each year needs to be assessed on its own terms

A multi-year claim isn't simply a matter of multiplying one figure by four. Each tax year is assessed using the rules, rates and thresholds that applied in that specific year — not today's rules applied backwards.

The higher-rate threshold was £50,270 in 2022/23 and has remained frozen since. But earlier years had different figures, and if your income was close to the threshold, it's possible some years qualify and others don't. Scottish taxpayers face additional complexity: the Scottish higher rate has changed across this period too.

This is one reason multi-year claims are harder to get right on your own. Applying the wrong year's rules to the wrong year's figures is a common error — and it can result in either an underclaim or an HMRC query.

Refund or tax code adjustment?

HMRC decides the payment method. For prior years, you'll typically receive a direct bank transfer. For the current or upcoming tax year, HMRC may instead adjust your tax code, which reduces your tax deduction in future payroll runs rather than paying cash.

If you file a Self Assessment return, the current year claim can be included there. Prior years may require a separate written claim to HMRC — your Potly claim pack will make clear which route applies to each year and give you everything you need for both.

Once submitted, HMRC typically responds within 8 to 12 weeks. Refunds are paid directly to your bank account.

How Potly helps

Start with Potly's free calculator to find out whether you're eligible and get an accurate estimate of what you might be owed across each year. The calculator applies the correct rules for each tax year — including the right thresholds, rates and contribution limits — so the estimate reflects your actual entitlement, not a rough approximation.

If you're eligible, our team of specialists prepares your full claim pack, which includes:

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Potly provides administrative support and specialist review only — not financial or pension advice.

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