The Department of Labour, Government of Bihar in a Notification dated 26th February, 2019 has introduced the formula for Variable Dearness Allowance in the minimum rates of wages fixed / revised for the different categories of employees employed in various scheduled employments in the State of Bihar.
It has further been informed that the payment of VDA on the basis of average index of July to December 2018 will be payable at the rates mentioned herein (refer to the hyperlink) from 1st April, 2019 and thereafter increase or decrease in the amount of VDA will be based on the average of All India Consumer Price Index number for every six months and will be applicable after the expiry of three months after a period of six months.
Source: Department of Labour, Government of Bihar