The US tax rules governing the taxation of equity awards for globally mobile employees are complex and in some cases, uncertain. Among other things, employers must consider the type of award, grant and vesting dates, and sourcing rules to ensure proper reporting and withholding for non-US employees that have worked in the United States. The travel restrictions have caused US multinational businesses to review their existing processes for how they compute and report taxable income for non-US employees working in the United States, especially with regard to vesting of equity arrangements.