The UK Supreme Court commented during the recent case of HMRC v Tooth [2021 UKSC 17] that ‘staleness’ is not a concept that can be used against discovery assessments, meaning that a discovery will not lose its quality over time. ‘Staleness’ has previously been argued by taxpayers to state that a discovery needs to be new and the discovery assessment needs to be issued within a certain period of time otherwise the discovery and the discovery assessment will not be valid. The concept of ‘staleness’ has been subject to numerous cases of litigation between HMRC and taxpayers since 2008 and this recent ruling has provided clarity on this matter. What is a Discovery Assessment? The rules for discovery assessments are largely ...