This Practice Note explains how trade sanctions breaches are enforced in the UK, how breaches of trade sanctions may be detected and the issues to consider when considering self-reporting trade sanctions breaches to the bodies which enforce trade sanctions including the Office of Trade Sanctions Implementation (OTSI), HM Revenue and Customs (HMRC), HM Treasury and Ofcom. It also explains the penalties for breach including the maximum sentence which can be imposed following conviction and the monetary penalties which can be imposed by OTSI with details of the process involved for the imposition and appeal of monetary penalties.