Margin Call Explained: What It Is and How to Avoid One

Before I ever touched margin, I thought I understood it. Then I watched someone I knew blow up a position during a crypto drawdown that triggered a margin call, and I saw exactly how fast it moves. What seemed like a manageable bet became a forced liquidation in hours. It was a useful lesson to witness from the outside.

A margin call is one of those concepts that’s easy to explain theoretically but hits differently when it’s your account. This guide breaks it down in plain terms: what triggers one, how brokerages calculate the threshold, and what you can actually do about it when one is approaching.

What Is a Margin Account?

Before explaining margin calls, it helps to understand what a margin account actually is. A margin account lets you borrow money from your broker to buy more securities than your cash alone would allow. The securities in your account serve as collateral for the loan.

Standard cash accounts require you to pay the full price for any security you buy. A margin account extends credit against your existing holdings so you can buy more. The interest rate on the borrowed funds is set by your broker and varies by account size and platform.

Margin amplifies both gains and losses. If you use 2:1 leverage and the position goes up 10%, you’ve made 20% on your capital. If the position drops 10%, you’ve lost 20%. The borrowed money doesn’t share in the pain; you owe it regardless of how your trade performs.

What Is a Margin Call?

A margin call is a demand from your broker to deposit additional funds or liquidate positions because your account’s equity has dropped below the required minimum.

Every margin account has two key thresholds:

• Initial margin requirement: The percentage of a position’s value you must fund with your own capital when opening a trade. Typically 50% for most stocks under Regulation T
• Maintenance margin requirement: The minimum equity percentage you must maintain after the trade is open. FINRA requires at least 25% for most stocks; brokers often require 30-40%

The margin call triggers when your equity falls below the maintenance margin. At that point, your broker has both the right and the obligation to bring the account back into compliance.

A Concrete Example

Say you have $10,000 in your account and borrow $10,000 more to buy $20,000 worth of stock. Your equity is $10,000 and the margin requirement is 25%.

The threshold: 25% of $20,000 = $5,000 in equity required.

If the stock drops 25% to a total value of $15,000, your equity is now $5,000 ($15,000 position minus $10,000 loan). You’re right at the margin call threshold. A further decline triggers the call.

If the stock drops another 5% to $14,250, your equity is $4,250. The required minimum is now $3,562.50 (25% of $14,250). But brokers often don’t wait for you to hit the exact threshold; they may issue a margin call warning earlier.

The math moves fast in volatile markets. A 30% position decline can trigger a call on a 50% leveraged account. In crypto with 2:1 leverage, a bad hour can do it.

What Happens When You Get a Margin Call

When the call is issued, your broker will:

1. Notify you by email, push notification, or phone (depending on how you’ve configured alerts)
2. Specify the amount you need to deposit or the value of positions you need to close
3. Give you a timeframe to respond, usually same-day or next-day but sometimes shorter during extreme volatility

If you don’t act within the required timeframe, the broker will liquidate positions in your account, usually starting with the most liquid, to bring the account back into compliance. They choose what to sell. You don’t. The sale may happen at prices that are already down significantly from where you bought in.

Some brokers have very short response windows. Robinhood, for instance, can issue a margin call and begin liquidating within the same business day if the account breaches minimum requirements. During fast-moving markets, the time between call and forced liquidation can be hours.

Margin Calls in Crypto vs. Traditional Markets

Crypto margin is more aggressive than traditional equity margin for several reasons:

• Crypto markets trade 24/7. A margin call can trigger at 3am when you’re asleep
• Crypto assets are more volatile; a 20% intraday move is not rare
• Many crypto exchanges offer much higher leverage (5:1, 10:1, even 100:1), which dramatically lowers the percentage drop needed to trigger liquidation
• Crypto exchanges don’t always give warning before liquidating; some use automatic liquidation engines with no call notice

In traditional brokerage accounts, the rules around notice and timing are more standardized. In crypto, read your exchange’s specific margin policy before using any borrowed capital.

Margin Buying Power on Robinhood

Robinhood Gold members have access to margin at a flat rate. Robinhood’s margin interest rate and the amount available depend on your account value and subscription tier. The margin buying power display shows how much you can borrow beyond your cash balance.

If you’re using Robinhood margin, the maintenance requirement is typically 25% for standard equities. Fractional shares and some volatile securities have higher requirements or aren’t marginable. Always check before relying on margin for a specific asset.

Related: Robinhood Margin Buying Power: Full Explainer

How to Respond to a Margin Call

If you receive a margin call, you have four options:

1. Deposit cash: The cleanest solution. Move funds from your bank or another account to bring equity above the maintenance minimum
2. Transfer securities: Some brokers let you transfer marginable securities from another account to increase your collateral
3. Close positions: Selling holdings reduces your borrowed balance and brings the equity ratio back up. The question is which positions you want to close and whether you want to sell at current prices
4. Do nothing: The broker liquidates for you. Not recommended unless you want zero control over what gets sold and at what price

Option 3 is often the realistic choice. The key is having a plan before the margin call arrives. Knowing in advance which positions you’d close first (lowest conviction, most liquid) makes execution faster and less panicked.

Avoiding Margin Calls: The Practical Approach

The surest way to avoid a margin call is to use less leverage than the maximum available. If your broker allows 2:1 on a $20,000 position, you’re not obligated to use all of it. Running 1.25:1 gives you much more headroom before you approach the margin call threshold.

Other practices that help:

• Monitor your margin ratio daily: Most platforms show your current equity as a percentage of total position value. Set an alert before you approach the minimum, not at it
• Keep a cash buffer in the account: Having 10-15% of your borrowed balance in cash gives you something to deposit immediately if needed without selling positions
• Don’t margin volatile positions fully: Using maximum margin on a volatile asset is a compounding risk. Use lower leverage for less liquid or more volatile holdings
• Understand the specific maintenance requirements for what you hold: Some assets have higher requirements. Concentrated positions in a single volatile stock may trigger higher broker-specific minimums

For more on portfolio risk management strategies, see my Covered Call Strategy Guide and Best Platforms for Dividend Investing.

Margin Call Math: A Practical Example

Understanding the mechanics prevents surprises. Here’s how a margin call plays out in practice on a standard 2:1 margin account.

You deposit $10,000 in cash. Your broker extends $10,000 in margin, giving you $20,000 in buying power. You buy $20,000 worth of stock. Your equity is $10,000 (50% of position value). The broker requires a maintenance margin of 25%.

The math: at 25% maintenance margin, you’ll receive a margin call when your equity drops to $5,000. This happens when your $20,000 position drops to approximately $13,333 in value (because $5,000 / $13,333 = 37.5%… actually the calculation is: position value × (1 – maintenance %) = equity floor, so $13,333 × 0.25 = $3,333… let me recalculate. If your position drops to $X, your equity is $X – $10,000 loan. Margin call when ($X – $10,000) / $X = 0.25, which gives X = $13,333). A drop from $20,000 to $13,333 is a 33% decline.

This is why volatile positions are dangerous on margin. A 33% drawdown isn’t unusual in individual stocks or crypto. Building positions with margin requires either high conviction, tight stop-losses, or enough cash cushion to absorb volatility without hitting the maintenance threshold.

Many brokers have house maintenance requirements above the FINRA minimum of 25%. Robinhood’s margin maintenance is typically 30%. Interactive Brokers uses a real-time risk model that can vary. Know your broker’s specific thresholds before using margin.

Frequently Asked Questions

What triggers a margin call?

A margin call is triggered when your account equity falls below the broker’s maintenance margin requirement. This typically happens when the value of your holdings declines significantly. The exact trigger depends on how much leverage you’re using and the broker’s specific maintenance requirement (usually 25% for equities).

How long do I have to respond to a margin call?

It varies by broker. Traditional equity brokers typically give you a business day or two. Some online brokers and crypto exchanges can begin liquidating positions the same day, especially during fast-moving markets. Check your broker’s specific policy, and respond as quickly as possible to maintain control over what gets sold.

Can a broker liquidate my account without warning?

Technically, yes. Most brokers reserve the right to liquidate margin positions without prior notice. In practice, most issue at least an email or app notification first. In extreme market conditions or on crypto exchanges with automated liquidation engines, liquidation can happen very quickly. The broker is not obligated to wait for you to take action.

Does a margin call affect my credit score?

No. Margin accounts are brokerage arrangements, not traditional loans, and they don’t report to consumer credit bureaus. A margin call won’t appear on your credit report. However, if you owe money to your broker after a forced liquidation doesn’t cover the full balance, that broker relationship becomes a separate issue.

What is the maintenance margin requirement?

The maintenance margin is the minimum equity percentage you must keep in your account after buying on margin. FINRA requires a minimum of 25% for most listed stocks. Many brokers set higher requirements (30-40%). Some volatile or low-priced stocks have requirements of 50-100%, meaning you can’t margin them at all or only minimally.

Can I use margin in an IRA?

No. Standard margin accounts are not available in IRAs because IRAs cannot take on debt. However, some brokers offer limited margin in IRAs that allow specific options strategies (like buying options or selling covered calls) without the ability to borrow cash to buy securities. This is sometimes called “limited margin” and is different from a standard margin account.

The Bottom Line

Margin is a tool that amplifies both gains and losses. Used with discipline, it can improve returns. Used carelessly, it can result in forced liquidations at the worst possible moment and losses larger than your original investment.

The investors who use margin successfully tend to use less of it than they’re allowed to. They keep cash reserves. They monitor their ratios. And they have a pre-planned response before any margin call arrives.

The investors who get hurt are usually the ones who loaded up to the maximum, assumed the position would recover, and woke up to a forced sale they didn’t authorize.

External resources: FINRA Margin Basics Guide | SEC Investor Bulletin: Margin Account