The Trust Registration Service (TRS) is HMRC’s online register for recording beneficial ownership and key information about certain UK and non-UK trusts for anti‑money laundering and tax transparency purposes. It is central to private client, tax, trusts and estates practice in England and Wales, Scotland and Northern Ireland. In the UK, the TRS is created and governed primarily by the Money Laundering, Terrorist Financing and Transfer of Funds (Information on the Payer) Regulations 2017 (as amended). These regulations set out which express trusts must register, deadlines, update requirements, and the limited circumstances in which information can be accessed by law enforcement and, in some cases, third parties with a legitimate interest. Registration typically involves providing details of the settlor, trustees, beneficiaries (or classes), trust assets and relevant tax information. Failure to register, or to keep details up to date, can attract HMRC penalties and may cause issues with banks, investment providers and conveyancers conducting client due diligence. The term “TRS” is specific to the UK; Ireland operates a separate Central Register of Beneficial Ownership of Trusts under its own anti‑money laundering regime, with similar but distinct registration obligations.