The domestic stock market opened with a decline on Thursday after US President Donald Trump announced 25 per cent tariff on India. The stock market showed a negative attitude along with early trade. The Sensex and Nifty started on the red mark due to the uncertainty caused by the tariff. In early trade, the Sensex fell 786.36 points to 80,695.50 and the Nifty fell 212.8 points to 24,642.25 points.