An obscure subsidiary of Microsoft Corporation, Ireland-based Round Island One Limited, has only about 1,000 employees. Nevertheless, Microsoft has gradually been shifting more income-generating activities to Ireland, which has a lower corporate tax rate than nations such as the United States and the United Kingdom. In one year alone, shifting more of its operations to Ireland allowed Microsoft to reduce its worldwide corporate income tax rate by 6 percentage points. What happened to Ireland's tax base as a result? What happened to tax bases in nations such as the United States and the United Kingdom?