A margin call is your broker demanding that you put more money into your account, or sell some of your holdings, because the value of your investments has fallen too far relative to what you borrowed. It is the risk that comes with trading on margin, and it has a nasty feature: it always arrives at the worst possible moment, when your portfolio is already down and you are least able to act calmly.
How margin works
Buying on margin means borrowing money from your broker to buy more stock than you could afford with cash alone. Under the Federal Reserve’s Regulation T, you must put up at least 50% of the purchase price yourself, so with $10,000 of your own money you can buy $20,000 worth of stock, borrowing the other $10,000. The stock you buy serves as collateral for the loan, and you pay interest on what you borrow.
Leverage magnifies everything. If the stock rises 10%, your $20,000 position becomes $22,000, and after repaying the $10,000 loan your equity is $12,000, a 20% gain on your original $10,000 instead of 10%. But if the stock falls 10%, your equity drops to $8,000, a 20% loss. The loan doesn’t shrink when the market falls. Your share of the account does.
What triggers a margin call
After the initial purchase, the rule that matters is the maintenance margin: the minimum percentage of the account’s total value that must be your own equity. FINRA, the industry regulator, sets the floor at 25%, but most brokerages require more, often 30% to 40%, and they can raise their requirements at any time.
When your equity as a percentage of the account’s total value drops below the maintenance requirement, you get a margin call. It can happen because the stocks you bought fell in value, because you withdrew cash, or because your broker raised its margin requirement. The trigger is always the same: too much of the account is now the broker’s money, and not enough of it is yours.
What happens when you get one
A margin call gives you a choice, but neither option feels good. You can deposit more cash or marginable securities to bring your equity back above the requirement, or you can sell some of your holdings to pay down the loan. Brokers typically give you a short window, often just a few days, to act.
Here is the part many investors don’t realize until it happens: your broker is not required to wait. If you don’t meet the call, the brokerage can sell your securities without notifying you first, and it gets to choose what to sell. That means forced liquidation often locks in losses on exactly the positions you’d have preferred to hold. Some brokers will even sell more than strictly necessary to get the account safely back above their requirement.
A worked example
Say you deposit $10,000 and borrow $10,000 from your broker to buy $20,000 of stock in one company. Your broker’s maintenance margin requirement is 25%. Everything is fine as long as your equity, the account value minus the loan, stays at or above 25% of the total account value.
Now the stock drops 35%. Your position is worth $13,000. The loan is still $10,000, so your equity is $3,000. As a percentage: $3,000 divided by $13,000 is about 23%, which is below the 25% requirement. Margin call.
To satisfy it, your equity needs to reach 25% of $13,000, or $3,250. You are $250 short. You could deposit $250 in cash, which brings equity to $3,250 with no selling. Or you could sell stock: selling reduces both the account value and the loan. The painful alternative is doing nothing, in which case your broker sells for you, on its own timeline.
How to avoid margin calls
The simplest way to avoid a margin call is to never borrow in the first place. But if you do use margin, borrow far less than the maximum: a modest amount of leverage leaves a wide cushion before the maintenance threshold becomes a problem. Keep extra cash or uninvested buying power in the account as a buffer, so a bad week doesn’t turn into a forced sale.
Diversification helps too. A margin account concentrated in one or two stocks can breach the requirement on a single bad day, while a spread-out portfolio rarely falls hard enough all at once to trigger a call. And set your own alerts well above your broker’s minimum, so you see the warning while you still have options. The defining feature of a margin call is that it takes control away from you. Everything you do beforehand is about making sure that moment never arrives.
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