HM Revenue & Customs (HMRC) has corrected a long-running error in its online state pension forecast system after nearly nine years of providing inaccurate retirement estimates to hundreds of thousands of people across the UK.
The issue meant some individuals were shown higher expected state pension payments than they were actually entitled to receive, potentially affecting retirement planning decisions.
What went wrong
The problem related to people who had previously been “contracted out” of the additional state pension before the new state pension system was introduced in April 2016.
Under the older system, workers in certain workplace or public-sector pension schemes paid reduced National Insurance contributions because part of their pension was provided privately instead of through the state.
However, HMRC’s digital forecast tool did not correctly factor in these contracted-out periods for some users. As a result, forecasts suggested they were on course for the full state pension when their entitlement was in fact lower.
The online forecast service was launched alongside the new state pension reforms in 2016 and has been widely used by people planning their retirement income.
Error lasted nearly a decade
Officials were made aware of discrepancies several years ago, but the correction has only now been fully implemented following system updates completed in early 2026.
HMRC temporarily paused access to parts of the forecast service while adjustments were made. The updated system now more accurately reflects individuals’ National Insurance contribution histories.
According to HMRC, the fix ensures future forecasts better align with entitlement calculations under the new state pension rules.
HMRC response
HMRC has apologised for the issue and advised people to check their pension forecasts again using the updated government service.
The department said forecasts should always be treated as estimates rather than guaranteed payment levels but acknowledged the importance of accurate information for retirement planning.
People can review their updated forecast via the official GOV.UK service:
- Check your State Pension forecast – https://www.gov.uk/check-state-pension
- View your National Insurance record – https://www.gov.uk/check-national-insurance-record
Who is affected?
Up to 800,000 people were left at risk of a retirement shortfall after receiving inflated forecasts
You may have been affected by the forecasting error if you:
- Worked in the UK before April 2016 and were part of a workplace or public-sector pension scheme
- Were contracted out of the additional state pension (common among teachers, NHS staff, civil servants, police, and large corporate pension schemes)
- Checked your state pension forecast online between 2016 and early 2026
- Were told you were on track for the full new state pension without making additional contributions
Those closest to retirement age may have had less time to correct contribution gaps, while younger workers still have opportunities to improve their entitlement.
What people should do now
HMRC is encouraging anyone who previously checked their forecast to review it again.
Steps to consider include:
- Logging into the GOV.UK forecast service to view updated figures
- Checking for missing National Insurance years
- Considering voluntary National Insurance contributions where appropriate
- Seeking independent financial advice if retirement plans relied on earlier forecasts
Currently, most people need 35 qualifying years of National Insurance contributions to receive the full new state pension, although individual circumstances can vary.
Why it matters
The correction highlights how many people rely heavily on official digital tools when making long-term financial decisions.
While the update improves accuracy going forward, the episode raises broader questions about how government systems communicate uncertainty in financial forecasts — particularly when citizens depend on them to plan decades ahead.
For many workers still years from retirement, the fix provides an opportunity to reassess savings plans and avoid unexpected income gaps later in life.
