HMRC take seriously and investigate all complaints from workers referred by the Acas helpline, or received via the online complaints form.
Complaint-led National Minimum Wage (NMW) cases often involve a range of different NMW breaches. It is only possible to determine the full extent of any underpayments, and the underlying reasons for these breaches, at the conclusion of an investigation.
In conjunction with the Department for Business, Energy and Industrial Strategy, HMRC publish information on completed investigations in an annual compliance and enforcement report. The latest report can be found at: