Key bills, Goods and Service Tax (GST) bill and the land acquisition bill, are expected to be presented during the Monsoon session, which starts from tomorrow.
"Investors seems to await the outcome of Parliament's monsoon session and... Corporate earnings with big corporate earnings like HDFC Bank, Infosys, HUL results scheduled for tomorrow," said Gaurav Jain, Director at Hem Securities.
The 30-share BSE index after remaining in positive zone briefly at the outset, succumbed to profit-booking and touched a low of 28,319.83.
The 50-issue Nifty settled 6.40 points or 0.07 per cent lower at 8,603.45.
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Tata Motors was the biggest loser among Sensex stocks by tumbling 1.89 per cent, followed by Vedanta 1.44 per cent.
Other losers on the index included HUL, BHEL, Coal India, HDFC, ICICI Bank, Maruti Suzuki and Axis Bank, among others.
The broader markets, however, saw buying activity. The BSE small-cap rose 0.40 per cent and mid-cap ended higher by 0.27 per cent.
In international market, gold prices tumbled 4.2 per cent to USD 1,086.18 an ounce in Singapore, its lowest level since March 2010 amid prospects for higher US interest rates.
On domestic front the metal plummeted by Rs 300 to Rs 25,700 per 10 grams, a level last seen in June 2013.
Sector-wise, BSE realty index suffered the most by falling 1.92 per cent, followed by metal by 0.51 per cent.