What is Margin?
Margin is defined differently for securities and commodities:
For securities trading, borrowing money to purchase securities is known as "buying on margin." The loan is collateralized by the securities and cash in your brokerage account.
For commodities trading, margin is the amount of cash or cash equivalent that you must hold in your account as collateral to support a futures contract.
Initial Margin Requirement
Initial Margin is the percentage of the purchase price of securities that you must pay for with your own cash and/or marginable securities.
Reg T currently lets you borrow up to 50 percent of the price of the securities to be purchased. So on stock purchases, Reg. T requires an initial margin deposit of 50% of the purchase value, which in turn allows the broker to extend credit or finance the remaining 50%.
For example, if you are purchasing $1,000 worth of securities, under Reg T, you are required to deposit $500 and allowed to borrow $500 to hold those securities.
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