HMRC’s main measure of the performance of its compliance work is through tracking compliance yield arising from its interventions.38 In December 2022, the NAO reported that HMRC’s compliance work offers good value for money.39 In the five years prior to the COVID–19 pandemic (2015–16 to 2019–20), CCG’s average yield per compliance worker was £1.48 million (in 2023–24 prices), or £1.41 million if two exceptionally large cases were excluded. Compliance productivity has fallen since, with average returns in 2023–24 of £1.27 million per compliance worker. In Autumn Budget 2024, the government gave HMRC funding to recruit 5,000 additional staff to generate £2.7 billion of additional tax revenue by 2029–30. This will require a productivity level of around £0.55 million per each new compliance worker.40