Post the Second World War, dearness allowance was introduced as a component by the government. After 2006, formula for calculating dearness allowance has been changed and currently, DA is calculated as mentioned below for the following set of employees-
For Central Government employees:
Dearness Allowance % =
((Average of AICPI (Base Year 2001=100) for the past 12 months -115.76)/115.76)*100
For Central public sector employees after 1/1/2007:
Dearness Allowance % =
((Average of AICPI (Base Year 2001=100) for the past 3 months -126.33)/126.33)*100
Where, AICPI stands for All-India Consumer Price Index.
From 1st of January 1996 onwards, dearness allowance is included in order to compensate for the price rise or inflation, in a specific financial year. Therefore, it is revised biannually, i.e. once on 1st January and then, on 1st July.