The Indian income-Tax is based on the concept of a slab system. Tax is applied to individuals accordingly. Moreover, The rates of slabs are revised every year during the budget announcement. According to the Income-tax of India- There are three types of taxpayers which are given below. Individuals who come under 60 years of age. Senior citizens residents are citizens who are between the age of 60 to 80 years of age. Senior citizens Who have crossed the 80 years of age.