HMRC Pensioner Tax Error Affects Millions as Refund Delay Continues

Up to 8.7 million pensioners have been overcharged by HMRC following a failure to account for the annual state pension increase under the triple lock mechanism. The error resulted in approximately £43.5 million in excess tax collection, with individual pensioners charged roughly £5 more than required. HMRC acknowledges the miscalculation and has committed to implementing a correction by summer, though questions remain about the timeline for issuing refunds.

How the Error Occurred

The mistake stemmed from HMRC's failure to properly adjust tax calculations when the state pension rose to £230.25 weekly in the 2025/26 tax year, an increase from £221.20 the previous year. The triple-lock guarantee ensures state pensions increase annually by the highest figure among average earnings growth, inflation, or 2.5 percent. This £9.05 weekly increase went unaccounted for in tax assessments, leading to inflated tax bills across the board.

The financial impact varied by tax bracket. Basic-rate taxpayers faced an additional £1.81 in tax, higher-rate taxpayers £3.62, and those in the additional rate bracket approximately £4. The error affected two groups: pensioners filing through self-assessment and those still employed paying tax via PAYE (Pay As You Earn) schemes.

Timeline and Political Response

Conservative MP Richard Holden first raised the issue in August through parliamentary questioning, alerting the exchequer secretary to the Treasury to the problem. However, The Sunday Times reported that HMRC did not formally notify the Department of Work and Pensions until October, creating a two-month delay in escalating the matter between government departments.

Opposition politicians have demanded greater transparency and faster action. Shadow Chancellor Sir Mel Stride called for HMRC to disclose the precise number of affected pensioners and to begin actively issuing refunds rather than waiting for the summer fix. He stated that ministers must investigate what happened and establish measures to prevent similar administrative errors in future.

What Happens Next

HMRC has stated it is working at pace to resolve the issue, with corrections expected by summer. The authority acknowledged the impact on affected pensioners and issued an apology. However, specific details about the refund process—whether payments will be automatic or require pensioner action—remain unclear. The delay in fixing a calculation error spanning nearly a year has intensified calls for improved oversight of tax administration systems.