During the two pandemic years of 2020–21 and 2021–22, ‘compliance yield’ (the additional revenues protected as a result of HMRC’s interventions) per staff member fell from £1.3 million a year to £1.1 million (in 2021 prices).10 HMRC told us this was due to several factors, including the fact that staff redeployed away from tax compliance and onto the COVID schemes were typically more experienced.11 HMRC’s operations were also affected by external factors such as court closures and requirements on homeworking, social distancing or personal protective equipment.12