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What is the 'Option Margin' The option margin is the cash or securities an investor must deposit in his account as collateral before writing options. Margin requirements vary by option type. Margin requirements are established by the Federal Reserve Board in Regulation T; individual brokers may impose additional requirements. The cash or securities an investor must deposit in his account as collateral before writing options. Margin requirements vary by option type. Margin requirements are established by the Federal Reserve Board in Regulation T; individual brokers may impose additional requirements.
A Margin is a procedure allowing investors to borrow against their existing holdings to buy more securities. Usually the loan value is 100% of the account value. Thus the margin requirement, the amount needed in the account to keep it open is 50% of the value. In other words one can buy $20,000 worth of stock for $10,000.