• A margin call is a broker’s demand that you deposit cash or marginable securities into a margin account when your equity falls below the required maintenance level.
– Trigger: equity / market value < maintenance margin (commonly 25% under FINRA/NYSE, though brokers often set higher minimums).
– You can meet a margin call by depositing cash, transferring marginable securities, or selling positions. If you don’t, the broker can liquidate positions without your consent and you remain liable for any shortfall.
– Trading on margin increases both upside and downside risk and can result in losses greater than your initial investment.
– High aggregate margin debt can amplify market volatility by forcing sales during downturns.
What is a margin call?
A margin call occurs when the equity in a margin account (market value of securities minus the loan from the broker) drops below the broker’s maintenance requirement. The broker then requires additional funds or collateral so the account meets the maintenance margin.
Basic formula
– Equity = Market value of securities − Loan balance
– Margin percentage = Equity / Market value
– A margin call is triggered when Margin percentage < Maintenance margin
What triggers a margin call?
– A fall in the market value of securities in the account (price declines).
– Changes to maintenance requirements (your broker may raise its internal maintenance requirement).
– Non-marginable securities or corporate actions that change margin eligibility.
– Large intraday moves or volatile markets that reduce account equity quickly.
Regulatory and industry standards
– FINRA and the NYSE generally require a maintenance margin of at least 25% for long positions. Brokers can require higher percentages (e.g., 30%–50%) — check your margin agreement for the exact figure.
Sources: FINRA, NYSE, SEC (see sources at the end).
Example of a margin call (step-by-step)
1. You buy 100 shares at $100 each = $10,000
2. You put up $5,000 of your own money and borrow $5,000 from the broker.
3. Loan = $5,000. Suppose maintenance margin = 25% (0.25).
4. Margin call condition: (Market value − Loan) / Market value < 0.25
Solve for Market value (MV): MV < Loan / (1 − 0.25) = 5,000 / 0.75 = $6,666.67
5. Per-share price that triggers the call: $6,666.67 / 100 shares = $66.67
So if the share price falls below $66.67, your equity percentage drops under 25% and a margin call could be triggered.
How to cover a margin call — immediate steps (practical)
1. Read the margin notice from your broker carefully to confirm amount and deadline.
2. Contact your broker immediately if you need clarification or to request options they may offer.
3. Deposit cash into the margin account — the fastest, simplest fix.
4. Transfer marginable securities into the account (make sure they are marginable and allowed by your broker).
5. Sell some securities in your account to reduce the loan balance — consider tax implications and market prices.
6. Use hedges (options) only if you understand the mechanics and the broker accepts the instruments as marginable collateral.
7. Follow up to confirm the account now meets maintenance requirements and verify no forced liquidations occurred.
Keep in mind:
– Brokers often reserve the right (per the margin agreement) to liquidate any or all securities immediately and without prior notice to restore the required margin level. You are responsible for any losses and any resulting deficit if sales don’t fully cover the loan.
– Some brokers may give 2–5 days to meet a margin call in practice, but legally they can require immediate cure.
Can a trader delay meeting a margin call?
– No guaranteed right to delay. Your broker may allow a short grace period, but they also generally reserve the right to liquidate positions immediately if you fail to meet the call. Don’t count on a delay.
How to avoid margin calls — practical prevention steps
1. Understand your broker’s initial and maintenance margin requirements before trading.
2. Maintain a cash or marginable-securities cushion above the maintenance margin — target well above the minimum.
3. Use lower leverage — avoid borrowing the maximum amount permitted.
4. Diversify holdings to reduce idiosyncratic risk in any one position.
5. Use stop-loss or stop-limit orders to limit downside (know these are not guaranteed in fast markets).
6. Avoid margining highly volatile or thinly traded securities that can gap lower.
7. Monitor positions and margin percentage daily (or set broker alerts).
8. Consider hedging concentrated positions with options if appropriate and permitted.
9. Keep some unpledged marginable securities or cash for emergencies.
Is it risky to trade stocks on margin?
Yes. Margin magnifies both gains and losses. Because you are using borrowed funds:
– You can lose more than your invested capital.
– You may be forced to close positions at unfavorable prices to meet margin calls.
– Interest costs add to trading costs; margin loans accrue interest which reduces net return.
Margin is a leveraged strategy suitable for experienced traders who understand and can manage the risks.
How can a margin call be met?
– Deposit cash
– Transfer marginable securities
– Sell securities in the account (proceeds reduce loan)
– In rare cases, post other approved collateral (check broker policies)
How can I manage the risks associated with trading on margin? (Checklist)
– Know margin rules and maintenance levels for your broker.
– Keep a cash cushion or excess equity (recommend: well above maintenance; e.g., 50%+ if you have concentrated risk).
– Limit position size and overall leverage.
– Monitor positions and set alerts for margin thresholds.
– Avoid using margin for long-term buy-and-hold unless you can comfortably service potential calls.
– Use risk-management orders and consider hedging concentrated positions.
– Understand interest rates charged on margin loans.
– Periodically stress-test your portfolio for drawdowns to see when a margin call would be triggered.
Does the total level of margin debt have an impact on market volatility?
Yes. High levels of margin debt can amplify market downturns. When prices fall sharply, forced selling to meet margin calls can create a feedback loop that pushes prices lower and triggers more margin calls — increasing market volatility and potentially causing severe price declines.
The bottom line
Margin can increase returns but also substantially increases risk. A margin call is a warning — and possibly an immediate requirement — to restore equity to required levels. Understand your broker’s rules, maintain a margin cushion, and have a plan to react quickly if a margin call arrives. For most long-term investors, buying on margin is unnecessary; for traders who use margin, rigorous risk management is essential.
Sources and further reading
– Investopedia: Margin Call
– U.S. Securities and Exchange Commission: Investor Bulletin — Understanding Margin Accounts
– U.S. Securities and Exchange Commission: Margin: Borrowing Money to Pay for Stocks
– Financial Industry Regulatory Authority (FINRA): Margin Account Requirements —
Related topics
– Buying on margin / margin accounts
– Short selling and margin for shorts
– Leverage and portfolio risk management
– Stop-loss and limit orders
– Options as hedges
Editor’s note: The following topics are reserved for upcoming updates and will be expanded with detailed examples and datasets.