In paying pensioners, a lump sum of their arrears, the Department may not be fully restoring them to the position that they would be in had the Department paid them correctly in the first place. The payment of a lump sum of arrears may affect the pensioner’s current or future entitlement to other benefits such as Pension Credit, housing benefit or social care provided by local authorities. The Department has demonstrated little interest in accounting for financial consequences of receiving a lump sum in its pensions reassessment and considers it to be the pensioner’s responsibility to advise the relevant authority should their circumstances and eligibility for benefits change. The Department added special payments of interest on top of arrears payments to those who contacted the Department about underpayments before January 2021 but chose to stop paying interest once the formal correction exercise began. The Department argued that it took this decision, jointly with ministers, for consistency with previous correction exercises and to comply with the principles of Managing Public Money. However, we do not think there is a convincing justification for treating those in scope of the exercise differently to those contacting the Department prior to it. With underpayments going as far back as 1985, the Department is unlikely to be restoring the pensioners to a position as if the issue never occurred, as would be expected according to the principles of Managing Public Money. Recommendation: The Department should establish the full extent of the impact on pensioners of receiving a lump sum of arrears of benefit, particularly for larger sums of arrears. It should seek assurance from local authorities that people are not treated prejudicially compared to how they would have been treated had they received the money over their proper period of entitlement. It should, as part of its Treasury Minute, set out how its payment of arrears without interest or further compensation is c