We have not been making predictions or assumptions. Our reporting has always been based on standard calculation used for the purpose. We feel that the members also should be aware of the calculation. Hence this article.
The IDA rate revision is based on All India Consumer Price Index. After Second Pay Revision w.e.f. 1.1.2007, the base index has also been revised to 1.1.2007, which is 126.33
For arriving at IDA increase we need to know the All India Consumer Price Index for
Industrial Workers [CPI(IW)] for the previous three months. For IDA revision w.e.f. 1st
July of a year, the CPI of March, April and May are required. For IDA revision w.e.f.1st
October, CPI of June, July and August are required and so on.
The average CPI of the three months is then taken for calculation and the following
formula is used:
New IDA rate = (Average CPI – Base Index) x 100
Base Index
Increase in IDA rate = New IDA rate – Old IDA rate
Example:
CPI for June 2009 153
July 2009 160
August 2009 162
Average: 158.33
Calculation: 158.33 – 126.33 x 100
-------------------------- = 25.3
126.33
IDA rate w.e.f. 1.7.2009 was 18.5
Therefore Increase in IDA rate w.e.f.1.10.2009 was = 25.3-18.5 = 6.8
CPI for a month is notified on the last day of the next month in Labour Bureau Website
at http://labourbureau.nic.in/indnum.htm. This information is also published in ‘The Hindu’ on
the first day of every month in Business column.
That’s all. It is so simple. Now, any one can on his own calculate the IDA rate increase w.e.f.
1.4.2010, on 31st March 2010 itself.
