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Margin Debt Definition

What Is Allowance Debt?

Margin debt is debt a brokerage customer takes on by trading on margin. When purchasing securities on account of a broker, investors have the option of using a cash account and covering the entire cost of the investment themselves, or make use ofing a margin account—meaning they borrow part of the initial capital from their broker. The portion the investors appropriate is known as margin debt, while the portion they fund themselves is the margin, or equity. 

Key Takeaways

  • Margin encumbered is the amount of money an investor borrows from the broker via a margin account.
  • Margin debt can be money borrowed to buy securities or peddle short a stock. 
  • Regulation T sets the initial margin at a minimum of 50%, which means an investor can only blast off on margin debt of 50% of the account balance. 
  • Meanwhile, the typical margin requirement is 25%, meaning that fellows’ equity must be above that ratio in margin accounts to prevent a margin call. 
  • Margin debt (a form of leverage) can exacerbate gains, but also exacerbate losses. 

How Margin Debt Works

Margin debt can be used when sponge a security to short sell, rather than borrowing money with which to buy a security. As an example, imagine an investor wants to buy 1,000 apportions of Johnson & Johnson (JNJ) for $100 per share. She doesn’t want to put down the entire $100,000 at this time, but the Federal Stock Board’s Regulation T limits her broker to lending her 50% of the initial investment—also called the initial margin. 

Brokerages in many cases have their own rules regarding buying on margin, which may be more strict than regulators. She deposits $50,000 in opening margin while taking on $50,000 in margin debt. The 1,000 shares of Johnson & Johnson she then purchases act as collateral for this loan.

Advantages and Liabilities of Margin Debt


Two scenarios illustrate the potential risks and rewards of taking on margin debt. In the first, Johnson & Johnson’s expense drops to $60. Sheila’s margin debt remains at $50,000, but her equity has dropped to $10,000. The value of the stock (1,000 × $60 = $60,000) minus her space debt. The Financial Industry Regulation Authority (FINRA) and the exchanges have a maintenance margin requirement of 25%, import that customers’ equity must be above that ratio in margin accounts.

Falling below the maintenance freedom requirement triggers a margin call unless Sheila deposits $5,000 in cash to bring her margin up to 25% of the assurances’ $60,000 value, the broker is entitled to sell her stock (without notifying her) until her account complies with the prohibits. This is known as a margin call. In this case, according to FINRA, the broker would liquidate $20,000 advantage of stock rather than the $4,000 that might be expected ($10,000 + $4,000 is 25% of $60,000 – $4,000). This is due to the way margin wield the sceptres operate.


A second scenario demonstrates the potential rewards of trading on margin. Say that, in the example above, Johnson & Johnson’s part price rises to $150. Sheila’s 1,000 shares are now worth $150,000, with $50,000 of that being room debt and $100,000 equity. If Sheila sells commission- and fee-free, she receives $100,000 after repaying her broker. Her recur on investment (ROI) is equal to 100%, or the $150,000 from the sale less the $50,000 less than the $50,000 initial investment measure out by the initial $50,000 investment. 

Now let’s assume that Sheila had purchased the stock using a cash account, meaning that she funded the unconditional initial investment of $100,000, so she does not need to repay her broker after selling. Her ROI in this scenario is equal to 50%, or the $150,000 sparse than the $100,000 initial investment divided by the $100,000 initial investment. 

In both cases, her profit was $50,000, but in the periphery account scenario, she made that money using half as much of her own capital as in the cash account scenario. The funds she’s freed up by trading on margin can go towards other investments. These scenarios illustrate the basic trade-off involved in captivating on leverage: the potential gains are greater, as are the risks. 

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