What is a Corporate Tax? – Investopedia

A corporate tax is a levy placed on the profit of a firm to raise taxes. After operating earnings are calculated by deducting expenses, including the cost of goods sold (COGS) and depreciation from revenues, enacted tax rates are applied to generate a legal obligation the business owes the government. Rules surrounding corporate taxation vary greatly around the world and must be voted upon and approved by the government to be enacted.

Source: Corporate Tax – Investopedia