You can generally buy and sell stock options, and stocks bought or sold through options, in the same day. If you make more than a certain number of same-day trades in a period, you may be subject to stricter rules about how much money you need in your account under SEC regulatios. Day Trading Requirements | Learn More | E*TRADE Triple leverage (3X) ETFs have margin requirements of 75% for long purchases and 90% for short sales. A customer with $40,000 of starting day trading buying power can purchase and day trade up to $13,333 of a long 3X ETF ($10,000/.75) and sell and day trade up to $11,111 of a short 3X ETF ($10,000/.90).