Abstract This research paper points on union budget is the step or the budgete of the Govt. to take better incentives for providing better allocation of funds to all the existing industries. The union budget will play a key role for the stock market on the day of budget session. Because if the union budget is affordable to the industries it will be on positive if not it will be negative. The proposed paper tells about the budget impact of 2020 which is negative on stock market. The main purpose of this research is to find out the fluctuations of the stock market over pre and post trading day respective to union budget presentation in parliament. In this research regression statistics tools are used in methodology.