Dear,
VDA is a benefit given to employees to meet the expenses for the rise in prices and is directly related to the CPI (Consumer Price Index) published by the Shimla Labour Bureau on a monthly basis. Currently, there are three base years, namely 1960=100, 1982=100, and 2001=100, on which the VDA is calculated. Organizations that provide VDA to employees can choose any of the base years for their VDA calculations. Generally, the union and management collaborate to determine the neutralizing factor for each point rise or fall in the CPI, for example, Rs 2/- per point or Rs 3/- per point. Once this is decided, for each month, we multiply the rise or fall in the CPI by the neutralizing factor and make VDA payments accordingly. Thus, VDA is variable as the name suggests, and it can rise or fall every month.
I understand that VDA is a complex concept, and providing detailed explanations here can be challenging. I hope this clarifies the concept for you.
Regards