Nifty future has lowest margin requirement in future segment for intraday trading, positional trading requires margin of Rs.30,000, where as nifty future intraday trading requires margin of just Rs.15,000. This is major reason nifty future is widely chosen as a trading instrument with high liquidity and volumes. Many stock brokers provide margin even lower than Rs.4000 for intraday trading in nifty future, but trader need to keep in mind that such low margins acts as double edged sword, which can magnify profits as well as loss. I do remember when one of my partners opened a long trade on nifty future above 5180 level of 2500 quantity with margin in his account just Rs.1,00,000. He made quick profit of 40 points and closed the trade, gaining 40*2500 = Rs.1,00,000 well he paid huge brokerage for that position it was about Rs.13,000 including taxes. Finally your trade will depend on your technical analysis skills, if your analysis is perfect you will make lot and lot of money doing few intraday trades in a month.