The so-called UK Mandatory Disclosure Rules came into force in the UK on 28 March 2023. They comprise new cross-border tax avoidance arrangement disclosure rules that implement the OECD Model Mandatory Disclosure Rules.

Cross-border tax avoidance arrangement disclosure rules implementing OECD Model Mandatory Disclosure Rules referred to as “UK MDR” have come into force in the UK on 28 March 2023. In-scope arrangements entered into on or after this date must be reported to HMRC.