The information requested is not held by the Department. The overall rate of State Pension underpayment due to official error remains low as a proportion of expenditure (0.5% in 2022/2023). Information on the broad categories where State Pension underpayments are most often identified was set out in the DWP Annual Report and Accounts 2022-23. DWP annual report and accounts 2022 to 2023 - GOV.UK (www.gov.uk) DWP is taking action to rectify historic errors in the State Pensions caseload. Our priority is to ensure that everyone receives their correct State Pension entitlement.