Incorrect State Pension Forecasts: 4 Errors to Check In 2026

Incorrect State Pension forecasts have become a much bigger issue in 2026, but there is an important point that many reports miss: there is not one single State Pension forecast error.

At least four different problems can cause someone to see the wrong pension figure, discover unexpected gaps in their National Insurance record or receive less State Pension than expected.

They include an error affecting people who were contracted out of the Additional State Pension, missing National Insurance years for some self-employed workers, historic Home Responsibilities Protection errors and underpayments affecting some married women under the old State Pension system.

That distinction matters because each problem affects a different group of people and requires a different response.

Someone worried about their pension should therefore check both their official State Pension forecast and their National Insurance record rather than assuming that a surprising figure must be caused by the latest headline.

For anyone unclear about how contributions and credits feed into retirement entitlement, UK Business.Blog also explains how National Insurance and qualifying years affect a State Pension.

Which Incorrect State Pension Forecast Error Could Affect You?

The quickest way to identify the relevant problem is to compare employment and family history with the periods affected.

The four issues can overlap. A person could, for example, have spent part of their career in a contracted-out pension scheme and also have missing National Insurance protection from years spent caring for children.

That is one reason simply asking whether a forecast is “correct” does not always produce an obvious answer.

Why Were Some Contracted-Out State Pension Forecasts Incorrect?

The highest-profile 2026 problem involved people who had previously been contracted out of the Additional State Pension.

Contracting out was a legitimate part of the pension system.

Employees in certain workplace or personal pension arrangements paid lower National Insurance, or had part of their contribution directed elsewhere, because their pension scheme was expected to provide benefits instead of the Additional State Pension.

Contracting out ended on 6 April 2016. GOV.UK confirms that people who were contracted out can consequently receive less than the full new State Pension, depending on their individual record.

The error was different.

The online forecasting system did not always correctly account for manual adjustments associated with contracting-out records.

This could result in someone being shown a pension figure that was too high or being told they did not need additional qualifying years when they actually did.

Press reports in February 2026 suggested up to 800,000 people could potentially have been exposed to inaccurate forecasts. However, that figure should not be presented as a confirmed count of people who definitely lost money.

When the issue was examined by Parliament on 18 March 2026, Pensions Minister Torsten Bell said the Government could not give an exact number because it depended partly on how many affected people had actually used the forecasting service.

He confirmed that permanent fixes had been introduced.

A further HMRC system update took effect on 13 February 2026, particularly improving forecasts for people reaching State Pension age after 5 April 2029. Which? subsequently reported that the February update extended the correction to this later group.

Who Should Recheck Their Forecast?

Someone should pay particular attention if they worked before April 2016 and belonged to a defined benefit, final salary or other contracted-out pension arrangement.

Old payslips can provide a clue. GOV.UK says National Insurance category letters D, E, L, N or O on pre-April 2016 payslips indicate that the employee was contracted out.

A person who checked their pension before the February 2026 correction may therefore want to obtain a fresh forecast and compare it with any saved screenshot, paper BR19 statement or previous retirement-planning calculation.

Contracted-Out Forecast Example

Suppose a previous forecast showed:

£241.30 a week

After the record is corrected, it shows:

£220.63 a week

That is a difference of £20.67 per week, or approximately £1,074.84 per year.

For 2026/27, GOV.UK says an additional qualifying year after 2016 can add approximately £6.89 a week to the new State Pension until the person’s maximum is reached. Three genuinely useful additional years could therefore add roughly £20.67 a week.

That does not mean the person should immediately pay for three old years. The Future Pension Centre or Pension Service should first confirm whether the particular years can be added and whether paying for them would actually increase the pension.

Why Can Self-Employed People Have Incorrect National Insurance Gaps?

A second 2026 problem has a completely different cause.

It concerns some people who became self-employed between 2015 and 2024.

During this period, simply registering for Self Assessment did not necessarily complete every administrative step needed for Class 2 National Insurance. New self-employed workers were also expected to notify HMRC of their self-employment using form CWF1.

If that separate notification did not happen, Class 2 contributions may not have been assessed or recorded correctly.

The consequence can be an apparently empty National Insurance year even though the person genuinely worked as self-employed during that period.

MoneySavingExpert reported in July 2026, based on HMRC figures, that the problem could affect around 800,000 people, including about 160,000 who had already reached State Pension age or were within two years of doing so.

HMRC has changed its systems for later years, so this particular problem should not continue in the same form.

When Will HMRC Contact Affected Self-Employed Workers?

HMRC began writing to affected people in stages during 2026.

Those already at State Pension age or within two years of it are expected to be contacted by summer 2027. Letters to other affected people are expected to begin from spring 2027.

Importantly, those caught by the error are expected to be given an opportunity to correct eligible years going back to 2015, rather than being restricted to the normal six-year window, with affected historic contributions payable at the relevant original rates.

As of September 2026, HMRC’s position reported by MoneySavingExpert is that potentially affected workers should not try to submit a retrospective CWF1 simply because they have seen the story.

HMRC is carrying out a controlled correction process and contacting affected people.

Self-Employment Error Example

Imagine a self-employed worker discovers that three qualifying years are absent from their record because of the CWF1 problem.

If all three years would genuinely increase their eventual new State Pension, and each ultimately produces an increase equivalent to about £6.89 a week at today’s 2026/27 rate, the combined effect could be approximately:

This is an illustration rather than a guarantee. Pre-2016 histories, contracting out and whether someone is already on course for their maximum pension can alter the calculation.

Could Missing Home Responsibilities Protection Make a Forecast Wrong?

Yes, and this may be one of the most financially significant errors.

Home Responsibilities Protection, or HRP, existed between 6 April 1978 and 5 April 2010 to protect the State Pension position of people who spent time caring for children or certain sick or disabled people.

National Insurance credits replaced HRP from April 2010.

People should generally have received HRP automatically in qualifying circumstances, including certain periods where they received Child Benefit for a child under 16. However, historic records were not always correctly linked.

One important problem involved older Child Benefit claims where the claimant’s National Insurance number was not correctly recorded.

GOV.UK confirms that someone can still apply for missing Home Responsibilities Protection if they believe eligible periods are absent.

The scale of the issue is substantial.

DWP’s earlier financial estimates suggested between approximately £300 million and £1.5 billion of State Pension may have been underpaid because of errors involving HRP records.

By 31 March 2025, the dedicated HRP correction exercise had identified 12,379 underpayments, with around £104 million in arrears paid. The average arrears payment at that stage was £8,377.

And this is not merely an old problem. DWP’s fraud and error statistics for the financial year ending 2026 continued to identify historic HRP recording problems as a major reason for contribution-related State Pension underpayments.

Are HRP Claims Delayed in 2026?

Yes.

MoneySavingExpert reported on 17 August 2026 that HMRC still had a substantial HRP backlog. Its report said applications lodged in January 2026 were being given an expected response around December 2026.

This makes HRP particularly important for anyone approaching retirement because correcting the National Insurance record can take months.

A real case reported earlier in 2026 involved a 74-year-old pensioner who applied in September 2025 and eventually received a February 2026 letter confirming £15,788 in State Pension back payments.

Individual amounts vary enormously. The example should not be treated as a standard HRP payout.

Are Married Women Still Being Underpaid State Pension?

Another State Pension error concerns the old basic State Pension, rather than forecasts under the new system.

The DWP correction exercise covered married people, widows and people aged over 80 whose pensions had not always been increased correctly.

By the final update covering the period to 31 March 2025, DWP had identified 130,948 underpayments worth £804.7 million across the main exercise.

For the married Category BL group alone, DWP had reviewed 321,439 cases and identified 47,004 underpayments, paying around £252.8 million. The reported average arrears payment for this group was £5,553.

However, there is a crucial distinction depending on when the husband reached State Pension age.

Husband Reached 65 Before 17 March 2008

A married woman who reached State Pension age before April 2016 and whose basic pension is below 60% of her husband’s basic State Pension may need to make a claim herself if her husband reached 65 before 17 March 2008.

The increase was not automatically triggered under those older rules.

That means the normal backdating position is generally much more restrictive and should not be confused with DWP computer-error cases.

Husband Reached State Pension Age On Or After 17 March 2008

For later cases, the increase should generally have happened automatically where the eligibility conditions were met.

If DWP failed to apply an automatic increase because of its own system error, much longer arrears can potentially arise.

GOV.UK confirms the continuing rules for people whose State Pension may be increased based on a spouse’s or civil partner’s record.

Married Woman Example

The maximum basic State Pension for 2026/27 is £184.90 a week.

Sixty per cent of £184.90 is:

£110.94 a week

Suppose an eligible married woman’s relevant basic pension is only £85 a week.

The possible difference would be:

£110.94 – £85 = £25.94 a week

That equates to approximately £1,348.88 a year at current rates.

The actual calculation must use the husband’s applicable basic State Pension rather than automatically assuming he receives the maximum, and the amount of backdating depends on the particular legal and administrative circumstances.

Were Incorrect State Pension Forecasts Already a Problem Before 2026?

Yes.

The current stories are part of a much longer history of problems with State Pension data.

In 2019, Pensions Minister Guy Opperman acknowledged significant problems with incorrect forecasts.

At the time, more than 12 million online forecasts had reportedly been viewed since the service launched in 2016, and government analysis suggested up to around 3% could have been affected by the data issue then under investigation.

That equated to roughly 350,000 to 360,000 potentially incorrect forecasts. Some cases involved complex employment histories and defined benefit pension membership.

The important lesson is that a forecast is an estimate based on the National Insurance data available to the system.

It is not an irrevocable promise of a particular payment.

Does A Lower Forecast Automatically Mean HMRC Has Made An Error?

No.

A forecast can legitimately be lower than the full State Pension.

The full new State Pension is £241.30 per week in 2026/27, but not everyone receives that amount.

People with pre-April 2016 contribution histories can have transitional calculations, while contracting out can also alter the amount.

Someone may additionally have insufficient qualifying years or gaps that have not yet been filled.

State Pension age itself is another separate issue. The UK is currently transitioning from 66 to 67, so retirement planning should distinguish between when the pension can be claimed and how much pension has been built. UK Business.Blog has a detailed explanation of whether State Pension age is 66 or 67 in 2026.

How Can Someone Check Whether Their State Pension Forecast Is Wrong?

A useful check is to work through the following sequence:

1. Save the current State Pension forecast. Record the weekly figure, maximum possible amount and any statement about adding qualifying years.
2. Check the full National Insurance record. Look for incomplete years and compare them with employment, self-employment and caring history.
3. Check for contracting out. Old payslips, pension paperwork and former pension providers can help establish whether a person belonged to a contracted-out arrangement.
4. Match suspicious gaps to life events. Self-employment beginning between 2015 and 2024 can indicate the CWF1 issue, while caring periods from 1978 to 2010 may point to HRP.
5. Keep old forecasts and correspondence. An earlier BR19 statement, screenshot or letter can become useful evidence if the figure later changes substantially.
6. Do not buy voluntary National Insurance blindly. Confirm that a particular year will increase the eventual State Pension before paying.
7. Escalate unexplained discrepancies to the correct department. HMRC normally deals with National Insurance records, while DWP/Pension Service deals with State Pension entitlement and payment.

That distinction between the NI record and the pension calculation is essential.

HMRC can correct a missing qualifying year, but DWP may then need to recalculate what that corrected year does to the person’s actual State Pension.

What Should Someone Do If They Disagree With The Correction?

There are different complaint routes depending on whether the disputed problem concerns DWP or HMRC.

DWP Or Pension Service Error

A person should first raise the problem with DWP or the Pension Service and use the formal DWP complaints procedure.

After receiving DWP’s final complaint response, they can ask the Independent Case Examiner to investigate. ICE generally requires contact within six months of DWP’s final response.

If the person remains dissatisfied after ICE’s final response, they can ask an MP to refer the case to the Parliamentary and Health Service Ombudsman. GOV.UK currently says this should normally happen within 12 months of the ICE response.

HMRC National Insurance Record Error

HMRC uses a different route.

A complaint normally goes through HMRC’s first review and, if necessary, a second-tier review.

Once both stages have been completed, the Adjudicator’s Office can independently investigate qualifying complaints about HMRC administration. The normal time limit is six months from HMRC’s second review.

After that, an MP can be asked to refer an unresolved complaint to the Parliamentary and Health Service Ombudsman.

Keeping copies of forecasts, National Insurance records, correspondence, dates of telephone calls and any financial decisions made in reliance on incorrect information can be important if the complaint involves alleged financial loss.

Will State Pension Back Payments Be Taxed?

State Pension is taxable income, although tax is not normally deducted directly before each State Pension payment reaches the recipient.

A large correction payment can therefore create understandable concern.

However, a State Pension arrears payment should not automatically be treated as though the whole sum arose as taxable pension income in the year the cash arrived.

HMRC guidance states that UK social security pension arrears are generally chargeable to the tax year or years to which the entitlement relates.

For example, if £12,000 of State Pension arrears relates to several previous tax years, the tax position may need to be reconstructed across those relevant years rather than treating the entire £12,000 as one year’s normal pension.

Anyone receiving a substantial back payment should keep the DWP calculation showing which years the arrears cover and check HMRC’s treatment carefully.

Can State Pension Arrears Affect Pension Credit?

Potentially.

This area is more complicated than simply asking whether a lump sum counts as savings.

Pension Credit may sometimes have been paid at a higher level because State Pension income that should have been received was missing.

DWP’s Pension Credit technical guidance says that where Pension Credit has been paid while another social security benefit such as State Pension was claimed but had not yet been paid, the later benefit arrears can normally be adjusted to recover the Pension Credit already paid.

The final net payment can therefore be lower than the headline State Pension arrears calculation.

Someone receiving Pension Credit should not assume that a large State Pension correction is completely separate from their means-tested benefit position.

Do These State Pension Errors Apply In Scotland And Northern Ireland?

The underlying State Pension and National Insurance issues are not simply English problems.

Contracting-out rules, National Insurance records and State Pension entitlement operate across the UK.

The main DWP State Pension LEAP statistics quoted above cover England, Scotland and Wales, while corresponding administration in Northern Ireland involves the Department for Communities. HRP correction activity has also taken place in Northern Ireland.

The practical point is that someone should use the pension and National Insurance contact arrangements applicable to where they live rather than assuming every DWP telephone number or complaint process is identical.

What Is The Incorrect State Pension Forecast Timeline?

The timeline shows why “incorrect State Pension forecasts” should not be treated as a single 2026 computer glitch.

Some errors date back decades.

What Is The Bottom Line On Incorrect State Pension Forecasts?

Anyone worried about incorrect State Pension forecasts should first identify which problem actually matches their history.

People who were contracted out before April 2016 should consider obtaining a fresh forecast following HMRC’s February 2026 system correction.

Someone who became self-employed between 2015 and 2024 should pay particular attention to unexplained National Insurance gaps and the separate CWF1 correction programme.

Parents and carers with missing years between 1978 and 2010 should investigate Home Responsibilities Protection rather than immediately paying voluntary National Insurance to fill those gaps.

Women who reached State Pension age before April 2016 should also check whether the old married woman’s pension rules could apply, particularly where their basic State Pension appears unusually low compared with their husband’s.

Most importantly, a National Insurance gap should be investigated before it is purchased.

If the gap exists because HMRC failed to record a contribution or credit correctly, paying to fill it could be unnecessary.

The safest sequence is to establish the correct National Insurance record first, obtain an updated State Pension calculation second and only then decide whether voluntary contributions or a formal complaint are required.

Frequently Asked Questions

Can A State Pension Forecast Be Wrong?

Yes. Forecasts rely on National Insurance data, and historic errors involving contracting out, missing contributions or missing credits have produced incorrect forecasts. A forecast is an estimate rather than a guaranteed pension award.

How Do I Know If My State Pension Forecast Is Incorrect?

Compare the forecast with the official National Insurance record and investigate unexplained gaps. Previous contracted-out employment, self-employment between 2015 and 2024 and caring periods between 1978 and 2010 deserve particular attention.

Was The State Pension Forecast Tool Fixed In 2026?

HMRC implemented a further system correction on 13 February 2026, improving forecasts for affected contracted-out workers, including people reaching State Pension age after 5 April 2029.

Are 800,000 People Affected By Incorrect State Pension Forecasts?

Up to 800,000 was reported as a potential exposure figure for the contracted-out forecasting problem, but the Government told Parliament in March 2026 that it could not give an exact number of affected users.

Separately, HMRC estimates around 800,000 people may be affected by the self-employed CWF1 National Insurance issue. They are two different figures relating to two different problems.

What Is The Self-Employed State Pension Error?

Some people who became self-employed between 2015 and 2024 registered for Self Assessment but did not separately notify HMRC using CWF1. This could have prevented Class 2 National Insurance from being recorded correctly and created pension gaps.

Can Missing Child Benefit Years Reduce My State Pension?

Potentially. Some people who cared for children between 1978 and 2010 are missing Home Responsibilities Protection because historic Child Benefit and National Insurance information was not properly linked.

How Much Could Someone Receive From An HRP Correction?

There is no fixed amount. By March 2025, DWP had paid around £104 million across 12,379 identified HRP underpayments, with average arrears of £8,377. Individual cases can be considerably higher or lower.

Should I Pay Voluntary National Insurance If My Record Shows A Gap?

Not immediately. First establish why the gap exists and whether filling it will actually increase the State Pension. Missing credits or administrative errors may be correctable without buying the year.

Can I Complain If An Incorrect Forecast Caused Financial Loss?

Yes. The route depends on the responsible organisation. DWP complaints can escalate to the Independent Case Examiner, while HMRC complaints can escalate to the Adjudicator’s Office. Both can ultimately reach the Parliamentary and Health Service Ombudsman through an MP.

Are State Pension Back Payments Taxable?

State Pension is taxable income, but arrears relating to earlier periods are generally attributed to the tax years to which the pension entitlement relates rather than automatically treating the complete lump sum as ordinary pension income for the year it arrives.

Figures and rules are correct to the best of the available information as of September 2026. State Pension entitlement can depend on an individual’s complete National Insurance record, transitional rules and personal circumstances. The article provides general information rather than individual financial or pension advice.