The long-term capital gains tax on equities and and 10 per cent tax on distributed income from equity-oriented mutual funds hit sentiments.
Market mood suffered another setback after Fitch Ratings today said high debt burden of the government constrains India's rating upgrade.
The flagship Sensex nosedived by 766.09 points to quote at 35,080 points in pre-close session with all the sectoral indices trading in the negative zone.
The 50-share NSE Nifty slumped 238.40 points, or 2.16 per cent to 10,778.50 points at 1500 hours.
While unveiling the Budget proposals for 2018-19, Finance Minister Arun Jaitley introduced 10 per cent tax on long-term capital gains from stock markets, exceeding Rs 1 lakh.
The Finance Minister also projected a fiscal deficit of 3.5 per cent of GDP for current fiscal against the earlier target of 3.2 per cent which also accelerated pace of selling by participants.