Margin Call: What It Is and What Happens When You Get One
How a Margin Call Gets Triggered
Every margin account has a maintenance margin requirement — the minimum percentage of equity you must maintain relative to the total market value of your holdings. FINRA sets the floor at 25%, but most brokers require 30–40%.
When the market value of your positions drops enough that your equity percentage slips below the maintenance threshold, the broker issues a margin call. This can happen during regular trading hours — or overnight if markets gap down.
Margin Call Example — Step by Step
Let’s walk through a concrete scenario with a 30% maintenance margin requirement:
| Item | Value |
|---|---|
| Your cash deposit | $10,000 |
| Stock purchased (on margin) | $20,000 (200 shares at $100) |
| Margin loan | $10,000 |
| Initial equity % | 50% |
| Maintenance margin | 30% |
The stock drops to $65 per share. Now:
| Calculation | Amount |
|---|---|
| Market value (200 × $65) | $13,000 |
| Margin loan | $10,000 |
| Your equity | $3,000 |
| Equity % ($3,000 ÷ $13,000) | 23.1% |
| Required equity (30% × $13,000) | $3,900 |
| Margin call amount | $900 |
Using the trigger price formula: $100 × (1 − 0.50) ÷ (1 − 0.30) = $71.43. Any price below $71.43 triggers the call. At $65, you’re well into margin call territory.
Your Options When You Get a Margin Call
| Option | How It Works | Considerations |
|---|---|---|
| Deposit cash | Wire or transfer enough cash to bring equity above the maintenance margin. | Most brokers give 2–5 business days, but this is not guaranteed. Some require same-day action. |
| Deposit securities | Transfer marginable securities from another account to increase your collateral. | The securities must be marginable and will be valued at current market price, not your cost basis. |
| Sell holdings | Sell enough positions to reduce the margin loan and restore your equity percentage. | Selling at depressed prices locks in losses. Consider selling your weakest positions first. |
| Do nothing | Your broker liquidates positions on your behalf — without your consent. | The broker chooses which positions to sell and is not obligated to pick the most tax-efficient or strategically sound ones. |
Margin Calls on Short Positions
Margin calls don’t just affect buyers. If you’re short selling and the stock rises, your equity erodes. The math works differently — your liability increases as the stock price goes up — but the outcome is the same: the broker demands more collateral or closes your position.
Short position maintenance margin is typically 30% (versus 25–30% for longs), reflecting the theoretically unlimited loss potential. A sharp rally in a heavily shorted stock can trigger cascading margin calls, fueling a short squeeze.
How to Avoid Margin Calls
Experienced margin users follow several practical rules to stay well above the maintenance threshold:
| Strategy | Why It Works |
|---|---|
| Use less leverage than allowed | Just because you can borrow 50% doesn’t mean you should. Keeping leverage at 20–30% gives you a large buffer before maintenance kicks in. |
| Diversify margin positions | A single concentrated position on margin is a recipe for a margin call. Spreading across uncorrelated positions reduces the odds of a sharp simultaneous decline. |
| Set stop-loss orders | Automatic sell triggers prevent positions from falling deep enough to trigger margin calls — though gaps can blow past stops. |
| Monitor your equity % daily | Know where you stand relative to maintenance margin at all times. Most brokers show this in real time on their platforms. |
| Keep cash reserves | Having uninvested cash in your margin account acts as a cushion, raising your equity percentage without buying or selling anything. |
Margin Call vs. Fed Call vs. House Call
| Type | Trigger | Details |
|---|---|---|
| Fed Call (Reg T Call) | You don’t deposit the required 50% initial margin when opening a new position. | Must be met within 2 business days. Issued at the time of purchase, not based on subsequent price changes. |
| Maintenance / House Call | Your equity drops below the broker’s maintenance margin (typically 30–40%). | This is what most people mean by “margin call.” Brokers may act immediately in volatile markets. |
| Minimum Equity Call | Your total account equity drops below $2,000 (or $25,000 for pattern day traders). | Must deposit funds to restore the minimum. Trading may be restricted until resolved. |
Key Takeaways
- A margin call occurs when your account equity falls below the broker’s maintenance margin requirement.
- You can meet a margin call by depositing cash, transferring securities, or selling positions — or your broker will liquidate for you.
- Brokers are not required to give you advance notice before liquidating positions to meet a margin call.
- The trigger price for a margin call is calculable: Purchase Price × (1 − Initial Margin) ÷ (1 − Maintenance Margin).
- Using less leverage than the maximum, diversifying, and keeping cash reserves are the best defenses against margin calls.
- Forced liquidations create unplanned taxable events that can be costly.
Frequently Asked Questions
How quickly do I have to meet a margin call?
It varies by broker. Most give 2–5 business days as a courtesy, but they’re legally entitled to liquidate immediately. In fast-moving or volatile markets, brokers often act within hours — or without any notice at all.
Can I negotiate a margin call?
Not really. A margin call is a contractual obligation defined by your margin agreement. You can sometimes ask for a brief extension, but the broker has no obligation to grant one. The best approach is to act immediately.
Do I still owe money after a margin call liquidation?
Possibly. If the broker sells your positions and the proceeds don’t fully cover the margin loan, you owe the remaining balance plus any accrued interest. This is known as a debit balance, and the broker can pursue collection.
Can a margin call happen after hours?
Yes. If your holdings include securities that trade in extended hours or on international exchanges, after-hours price movements can trigger margin calls. The broker may issue the call before the next trading day opens.
What’s the difference between a margin call and a maintenance call?
“Margin call” is the general term most people use. Technically, a Fed call relates to the initial 50% requirement under Regulation T, while a maintenance call (or house call) occurs when your ongoing equity falls below maintenance margin. In everyday use, they’re often used interchangeably.