HMRC Could Owe You Thousands in Forgotten Pension Tax Relief — Here’s How to Check

Higher earners paying into certain workplace or personal pensions may not receive their full tax relief automatically. A few minutes checking your pension could uncover a valuable refund.

Millions of Britons pay into pensions every month, believing all the available tax relief has been added automatically.

But that is not always the case.

If you pay higher-rate or additional-rate Income Tax and your pension uses a system called “relief at source”, your provider normally claims only basic-rate relief. You must claim the remaining amount from HM Revenue and Customs yourself.

Failing to do so could leave hundreds—or potentially thousands—of pounds unclaimed.

The pension mistake that could be costing you money

Under relief at source, an £80 personal contribution is automatically increased to £100 after the pension provider claims £20 from HMRC.

That provides the full relief for a basic-rate taxpayer. However, someone paying tax at 40% may be able to claim another £20, reducing the effective cost of that £100 pension contribution to £60.

An additional-rate taxpayer paying 45% tax could potentially claim another £25, bringing the effective cost down to £55.

HMRC confirms that taxpayers whose providers claim only the first 20% may need to claim the additional relief themselves. HMRC pension tax-relief guidance

Scottish taxpayers face different Income Tax bands and should check the separate relief rates listed in the same guidance.

Who should check immediately?

You could be missing pension tax relief if:

• You pay Income Tax above the basic rate.
• You contribute to a personal pension, stakeholder pension or SIPP.
• Your workplace pension operates under relief at source.
• Your earnings recently moved into a higher tax band.
• You made a large one-off pension contribution.
• Someone else contributed to your pension.
• Your employer or pension provider did not apply relief automatically.

Personal pensions and SIPPs generally use relief at source, while workplace schemes can use relief at source, net pay or salary sacrifice.

If your contributions are deducted from your gross salary under net pay or salary sacrifice, the appropriate relief is normally provided automatically. Check your payslip or ask your payroll department before submitting a claim—you should not claim the same relief twice.

How much could you reclaim?

The answer depends on your taxable income, contribution amount and pension arrangement.

For example, a higher-rate taxpayer making £8,000 in net relief-at-source contributions would normally see the provider add £2,000, creating a £10,000 gross pension contribution.

They could then be entitled to claim another £2,000 of higher-rate relief, assuming the entire contribution falls within income taxed at 40%.

Your refund may be smaller if only part of your income falls inside the higher tax band.

Pension tax relief is also subject to limits. It is generally available on contributions up to 100% of relevant UK earnings, while the standard annual allowance is normally £60,000. Tapered annual allowance and money purchase annual allowance rules can reduce that limit for some people. HMRC pension tax overview

How to claim your missing relief

If you complete a Self Assessment tax return, include your gross pension contributions—the amount after basic-rate relief has been added—in the relevant pension section.

For the 2025–26 tax year, the key deadlines are:

• 5 October 2026: Register for Self Assessment if required.
• 31 October 2026: Submit a paper tax return.
• 31 January 2027: Submit an online return and pay any tax owed.

These dates replace the expired January 2026 deadline mentioned in older coverage. Current Self Assessment deadlines

If you do not submit Self Assessment returns, you may be able to claim through HMRC’s online pension relief service or by post. Claims for earlier years may require a different route, and time limits apply. You can generally correct a Self Assessment return within 12 months of its filing deadline. HMRC correction rules

What you will need

Before starting a claim, gather:

• Your National Insurance number.
• The name of each pension provider.
• Your pension or payroll reference.
• The net amount you personally contributed during each tax year.
• Pension statements or payslips showing the payments.
• Evidence showing whether basic-rate relief was added automatically.

HMRC says it may ask for supporting evidence and aims to contact claimants within 28 working days after receiving an eligible claim. HMRC’s pension relief claim service

Do not assume your pension provider has claimed every penny available.

If you pay tax above the basic rate and contribute to a relief-at-source pension, checking your statements could reveal a substantial amount of overlooked tax relief.

The money is not a bonus or giveaway—it is relief you may already be legally entitled to receive. The sooner you check, the less chance there is of an older claim falling outside HMRC’s time limits.