Hundreds of thousands of Britons have been given a state pension warning by HM Revenue and Customs (HMRC), who are at risk of losing their retirement entitlement. Some 800,000 Britons could be hit with a state pension shortfall | GETTYThe tax authority is now preparing to contact those potentially impacted, warning that the shortfall could have a significant effect on the pension payments they ultimately receive. Around 160,000 of those affected are already at or approaching state pension age, making the matter particularly urgent for this group. HMRC will begin its outreach by writing to those who are within two years of reaching state pension age, prioritising the most time-sensitive cases first. The tax authority has confirmed that for anyone who became self-employed from the 2024/25 tax year onwards, the underlying issue has already been rectified.