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ARTICLE · 13 APRIL 2023

UK Mandatory Disclosure Rules Come Into Force

The new UK mandatory disclosure rules (MDR), which came into effect on 28 March 2023, require taxpayers and advisers – which are referred to as "intermediaries" and include lawyers and accountants...

United KingdomTax

New regulations require in-scope tax advisers to report details of avoidance arrangements online in XML file format

The new UK mandatory disclosure rules (MDR), which came into effect on 28 March 2023, require taxpayers and advisers – which are referred to as "intermediaries" and include lawyers and accountants – with a UK nexus to report prescribed arrangements and structures to HMRC.

Broadly speaking, the prescribed arrangements are those that are designed to facilitate non-compliance through the use of Common Reporting Standard (CRS) avoidance arrangements and opaque offshore structures and are based closely on the Organisation for Economic Co-operation and Development's model rules. The new rules also include a "look back" period (to 25 June 2018) for reporting pre-existing arrangements that have been entered into and not already reported. HMRC introduced this one major change to earlier draft regulations in its long-awaited response to the consultation on

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