Is Indian automobile sector performance get affected post implementation of GST in India?

The study is on financial ratios of 15 Indian Automobile firms with reference to pre and post GST Implementation.A total of 15 companies of automobile industry are taken as the sample size based on market capitalisation.Various ratios such as profitability, margin, liquidity, solvency and efficiency/activity ratios are assessed for the period of 12 years (6 before GST and 6 after GST).The average ratios of all 15 companies taken as base for assessing pre and post impact.The majority ratios shown the changes in numerical value of ratio before and after implementation of GST.The observed difference is negative in majority of ratios.Out of 15 ratios evaluated only 6 ratios have shown significant difference in pre and post implementation of GST using statistical testing (paired t -test).The efficiency and capital productivity is significantly affected by the reforms in indirect taxes.