So far my knowledge goes, except for Minimum Wages, there is no other act(s) where the payment of DA and VDA is a component of the remuneration package. In the Central Govt. and State Govt., VDA is a component of remuneration determined by the Pay Commission. In the Banking sector, VDA is also a part of the remuneration package decided during Bi-partite negotiation.
To my knowledge, most of the new private organizations are not paying any FDA or VDA. Even if there is anything, it may be for workers (rare cases). Old private organizations have VDA for unions. But there is no VDA for management staff in probably all old and new organizations.
Now, coming to the revision of VDA. We mostly consider the revision of VDA based on the Govt. of the State/Central, which is made for minimum wages. There are many old private organizations where union(s) have implemented VDA as a part of the remuneration with a different VDA scheme. CPI data is available against different base years on a monthly basis. The VDA scheme may be the neutralization of the increase index by a certain money value as agreed between Management and Union. It may be % wise neutralization. It may be monthly, quarterly, semi-annually, or yearly.
In WB, we have noticed it is a quarterly review. It is basically the difference in the average index for a quarter vs the average index of another quarter. For example:
INDEX QUARTER PAYABLE QUARTER
JAN, FEB, MAR JUNE, JULY, AUG
APR, MAY, JUNE SEPT, OCT, NOV
JULY, AUG, SEPT DEC, JAN, FEB
OCT, NOV, DEC MAR, APR, MAY
There is a gap of two months between the index quarter and the payable quarter because of non-availability of data on time. The base year in most organizations is 1960 = 100.
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