Income tax is a direct tax that is levied on the total income of an individual in the previous year. It is governed by the Income Tax Act of 1961 which applies to all of India. The Act defines key terms like assessee, assessment year, and previous year. An assessee refers to any person who is liable to pay tax under the Act. The previous year is the financial year prior to the assessment year in which the income is taxed. Tax planning helps individuals minimize their tax liability and reduce litigation by utilizing available exemptions, deductions and benefits.