Futures margin requirements, can more than the initial margin be used to open a contract

How much margin can you get?

50 percent

Amount You Can Borrow – Initial Margin
According to Regulation T of the Federal Reserve Board, you may borrow up to 50 percent of the purchase price of securities that can be purchased on margin. This is known as the “initial margin.” Some firms require you to deposit more than 50 percent of the purchase price.