The Brexit vote last week delivered an unexpected (depending on who you ask) macro surprise to financial markets across the globe. While the impact of broad-based volatility on individual companies will obviously vary, negative shocks to stock prices can trigger the need for impairment tests. The following outlines some recent changes to the impairment testing regime – this post first appeared in October 2015 on the Financial Reporting Blog, which provides corporate finance managers with periodic updates and commentary around several topics including impairment testing.