Millions of UK pensioners could be affected by an HMRC tax calculation error that may have resulted in overpayments of around £5 per person.
The issue arose after HMRC reportedly failed to correctly account for the latest State Pension increase under the triple lock system, potentially impacting up to 8.7 million pensioners who pay tax through PAYE or self-assessment.
While HMRC has apologised and is working on a fix, many pensioners are wondering whether they have been overcharged and if they will receive a refund.
Key Takeaways:
- Up to 8.7 million pensioners may have paid too much tax.
- The average overcharge is estimated to be around £5 per person.
- The issue is linked to a State Pension increase calculation error.
- Both PAYE and self-assessment taxpayers may be affected.
- HMRC has acknowledged the mistake and plans to correct it.
- Pensioners may be entitled to refunds if they were overcharged.
- Checking tax codes and pension income records is recommended.
Why Are Millions of Pensioners Being Charged More Tax by HMRC?
Millions of UK pensioners may have paid slightly more tax than they should have after an HMRC pensioner tax increase error affected pension income calculations.
Reports suggest up to 8.7 million pensioners were charged around £5 extra on their tax bill, meaning HMRC may have collected as much as £43.5 million in error last year.
The issue is linked to how HMRC calculated state pension income following the annual triple lock increase. Although the average overcharge appears small, the scale of the problem has raised serious questions about accuracy, communication and refund arrangements.
For pensioners already dealing with higher living costs, even a small tax error can feel frustrating. Many retired people rely on fixed incomes, and unexpected tax changes can create confusion when they receive PAYE notices, tax codes or self-assessment calculations.
How Was the Tax Overcharge Identified?
The error was reportedly raised with HMRC in August, with the Department for Work and Pensions (DWP) later alerted in October. HMRC has since acknowledged the issue and said it is working to correct it.
An HMRC spokesperson said:
“We apologise to those affected by this error and are working at pace to fix the issue, although the impact is small with the difference in tax owed being around £5 in most cases.”
The Scale of the Issue Across the UK
| Issue | Reported Detail |
| Estimated pensioners affected | Up to 8.7 million |
| Average overcharge | Around £5 |
| Possible total collected in error | Up to £43.5 million |
| Main cause | State Pension rise miscalculation |
| HMRC fix expected | Later this summer |
What Caused the HMRC Pensioner Tax Increase Error?
The HMRC pensioner tax increase error appears to have happened because the HMRC did not correctly account for the annual rise in the State Pension under the triple lock.
The triple lock increases the State Pension each year by whichever is highest: average earnings growth, inflation, or 2.5 per cent. For 2025/26, the new State Pension rose to £230.25 per week, up from £221.20 in 2024/25.
The miscalculation meant pension income was recorded as £9.05 higher than it should have been. That small weekly figure then affected tax calculations for pensioners whose income was taxable.
The Role of the State Pension Triple Lock
The State Pension is taxable, although it is usually paid without tax being deducted directly. Instead, HMRC often collects tax due through a pensioner’s PAYE code, employment income, private pension, or self-assessment return.
| Taxpayer Type | Estimated Extra Tax |
| Basic-rate taxpayer | £1.81 |
| Higher-rate taxpayer | £3.62 |
| Additional-rate taxpayer | Around £4 |
| Average stated by HMRC | Around £5 |
A retired tax adviser described the confusion clearly:
“I have seen pensioners assume their tax code must be right because it came from HMRC. In reality, even a small error in pension income can change the tax deducted, and most people would not immediately spot a difference of a few pounds.”
How Much Extra Tax Have Pensioners Paid?
Most affected pensioners appear to have paid around £5 more than they owed. While this may not sound substantial for one person, it becomes a much larger issue when multiplied across millions of pensioners.
The total possible overcollection has been estimated at £43.5 million. This has led to calls for HMRC to be transparent about how many people were affected and how refunds will be issued.
| Number of Pensioners | Average Overcharge | Possible Total |
| 1 million | £5 | £5 million |
| 5 million | £5 | £25 million |
| 8.7 million | £5 | £43.5 million |
Which Pensioners Have Been Impacted by the HMRC Tax Miscalculation?
The issue did not affect every pensioner in the same way. It mainly affected pensioners whose tax position included the State Pension and who pay income tax through self-assessment or PAYE.
Self-Assessment Taxpayers
Some pensioners complete a self-assessment tax return because they have income from property, investments, work, or multiple pensions. If the State Pension figure used in the return was too high, the final tax bill may also have been too high.
Pensioners Paying Tax Through PAYE
Other pensioners may still be working or may receive an occupational or private pension taxed through PAYE. In these cases, HMRC can adjust a tax code to collect tax due on the State Pension. If the pension income figure was wrong, the PAYE code may also have collected too much.
How Does the State Pension Increase Affect Tax Calculations?
The State Pension counts as taxable income, but tax is not usually deducted before it is paid. This makes pension tax slightly confusing for many retirees.
A pensioner may receive:
- State Pension
- workplace pension income
- private pension withdrawals
- earnings from part-time work
- savings interest
- rental income
- investment income
If total taxable income rises above the personal allowance, income tax may be due. Because the personal allowance has been frozen, more pensioners are gradually being pulled into paying tax as the State Pension rises.
| Income Source | Taxable? | How Tax May Be Collected |
| State Pension | Yes | PAYE code or self-assessment |
| Workplace pension | Yes | PAYE |
| Private pension | Usually yes | PAYE |
| ISA income | No | Not taxed |
| Savings interest | Sometimes | PAYE or self-assessment |
What Has HMRC Said About the Pensioner Tax Overcharge?
HMRC has apologised and confirmed that it is working to correct the issue. It has said the average impact is small, with most affected people paying around £5 more than they should have.
However, critics argue that the size of the individual error should not distract from the overall problem. When millions of pensioners are affected, even a small error becomes a major administrative concern.
A chartered accountant explained the issue in practical terms:
“I would not tell a pensioner to ignore this just because the amount is small. I would advise checking the tax code, reviewing the State Pension figure used, and keeping any HMRC letters. Small errors can still reveal bigger problems in the way income has been recorded.”
When Will HMRC Correct the Pension Tax Error?
HMRC has said it aims to introduce a fix later this summer. The exact process for correction may depend on how the pensioner pays tax.
Some pensioners may see a future PAYE code adjustment. Others may receive a repayment or have their self-assessment position corrected. At this stage, the key concern is whether HMRC will automatically identify everyone affected or whether pensioners will need to take action.
Could Pensioners Be Entitled to a Tax Refund?
Pensioners who have paid too much tax may be entitled to a refund. The amount is likely to be small for most people, but affected taxpayers should not have to lose money because of an HMRC calculation error.
Potential Refund Process
Refunds may happen through:
- a PAYE tax code correction
- a direct repayment from HMRC
- a self-assessment adjustment
- a tax account update
What Pensioners Should Check
Pensioners should review recent HMRC letters, PAYE coding notices and self-assessment records. They should compare the State Pension figure used by HMRC with the actual amount received.
What Are Politicians Saying About the Issue?
The issue has attracted political attention. Conservative MP Richard Holden raised the error in a parliamentary question to Dan Tomlinson, the Exchequer Secretary to the Treasury. Mr Tomlinson later said that most pensions do pay the right amount of tax in real time.
Shadow chancellor Sir Mel Stride also called for clarity, saying that if HMRC had charged millions of pensioners too much tax, questions needed to be answered and the matter should be urgently corrected.
The concern is not only about the money collected, but also about public trust. Pensioners expect official tax calculations to be accurate, particularly when many may not feel confident challenging HMRC.
How Can Pensioners Check Whether They Have Been Overcharged?
Pensioners can start by checking whether their State Pension figure, PAYE code and tax calculation look correct. They do not need to panic, but they should keep records and query anything that looks wrong.
| Check Area | What to Review | Why It Matters |
| PAYE tax code | Current and previous tax code notices | Shows how HMRC is collecting tax |
| State Pension amount | Weekly and annual pension figures | Confirms taxable pension income |
| Self-assessment return | Pension income entry | Helps identify overstated income |
| HMRC personal tax account | Online tax records | Shows income and tax position |
| Pension provider letters | Annual pension statements | Confirms private pension tax |
Useful steps include:
- checking HMRC’s recorded State Pension amount
- reviewing any tax code changes
- comparing pension statements with tax records
- contacting HMRC if figures appear incorrect
- keeping copies of letters and calculations
Conclusion
The HMRC pensioner tax increase error could affect up to 8.7 million pensioners, with many paying around £5 more than they owed. Although the individual amount may be small, the total sum involved and the number of people affected make this a serious issue.
Pensioners should check their tax codes, State Pension figures and HMRC records carefully. Those who believe they have been overcharged should contact HMRC or seek guidance from a qualified tax professional.
FAQs
Can a small tax error still affect pensioners significantly over time?
Yes. A single £5 error may seem minor, but repeated mistakes or unclear tax records can create stress and confusion, especially for pensioners on fixed incomes.
Will HMRC automatically refund pensioners who paid too much tax?
HMRC has said it is working on a fix, but pensioners should still check their records to make sure any correction is applied properly.
Does the issue affect all recipients of the State Pension?
No. The issue mainly affects pensioners whose State Pension income was used in taxable income calculations through PAYE or self-assessment.
How can pensioners find out whether they were overcharged?
They can compare their State Pension amount with the figure used by HMRC, review their PAYE tax code, and check self-assessment records if applicable.
Are PAYE taxpayers and self-assessment taxpayers affected differently?
Yes. PAYE taxpayers may see the issue through their tax code, while self-assessment taxpayers may see it in their tax calculation or final bill.
Could future State Pension increases create similar tax issues?
Yes, if pension income data is not updated correctly. Annual State Pension rises need to be accurately reflected in HMRC systems.
What records should pensioners keep when checking their tax position?
They should keep HMRC letters, PAYE coding notices, pension statements, self-assessment returns and any correspondence about refunds or corrections.