The document provides an overview of recent global tax trends and their impact on multinational companies' mobility programs. It discusses tax reforms in China that phase out preferential tax treatment for expatriates and introduce new deductible expenses. It also examines the potential social security cost impacts of Brexit for US companies operating in the EU. Additionally, it analyzes a recent Indian Supreme Court ruling that removes the salary cap for social security contributions of "international workers", increasing costs. The document concludes by exploring shifts to shorter assignments and allowance-based approaches in the US post-Tax Cuts and Jobs Act.