Corporate tax is collected from companies incorporated in India and is levied on their global income if the company's control and management is in India. Corporate tax planning aims to minimize current and future tax liabilities through comparing opportunities to defer or reduce taxes, as corporate tax is a significant overhead cost. The minimum alternate tax of 18.5% of book profits is levied if it exceeds the tax payable under normal provisions. Calculation of book profits involves adding certain expenses back and deducting certain incomes for tax purposes.