In Guam, the Corporate Income tax rate is a tax collected from companies. Its amount is based on the net income companies obtain while exercising their business activity, normally during one business year. The benchmark we use refers to the highest rate for Corporate Income. Revenues from the Corporate Tax Rate are an important source of income for the government of Guam. This page provides - Guam Corporate Tax Rate- actual values, historical data, forecast, chart, statistics, economic calendar and news. Guam Corporate Tax Rate - actual data, historical chart and calendar of releases - was last updated on April of 2018.