NO thats not the case...IT works from company to company..I think there is some law under which if all the employees of a company are above a particular income bracket then the company has the option of either deducting a sum of Rs. 750 P.M or dedecuting 12% of the basic. The thing is that it has to be uniform across the company. Al lof to agree to either of the above option. You cannto have one half contributing on Rs. 750 and the other half contributing 12%.