The Adjudicator’s Office is a UK non-departmental public body which was set up in 1993, initially to look into complaints about the Inland Revenue (including the Valuation Office Agency).

HM Customs and Excise and the Contributions Agency joined in 1995.

In April 2005, the role continued in relation to HM Revenue and Customs (HMRC), which was formed by the merger of the Inland Revenue and HM Customs and Excise.

[1] In March 2015, the Adjudicator was asked to become the independent reviewer for complaints about HM Treasury, Pension Wise.

The Insolvency Service took its investigation of complaints in house in early 2016–17.