Margin Call: What Triggers One and What Your Broker Can Do

How much stock do you have to sell to cover a $250 shortfall? The instinctive answer is $250. The answer, on a long position held under a 25% requirement, is $1,000, and the gap between those two numbers is the part of a margin call that catches people when they try to fix it themselves.

A fed call or a maintenance call

A margin call is a notice, and it shows up in a few places: an email or app alert, a line in the account’s balances marked as a call with an amount and a due date, and on the monthly statement if it was open at month end.

A fed call is the Regulation T kind. It means a purchase went through without the initial deposit behind it: you bought more than your cash and loan value could cover, and the firm wants the difference paid.

A maintenance call comes later. A position you already hold has fallen, and equity now sits under the broker’s maintenance margin figure. Nothing you did triggered it. The price did.

Brokers also issue house calls against their own higher requirements. On most statements those look the same.

Meeting it, and what each route costs

You can deposit cash, deposit fully paid marginable securities, or sell. Each one fixes a different amount of shortfall per dollar.

Take an account holding $33,000 of stock against a $25,000 loan. Equity is $8,000. A 25% requirement on $33,000 is $8,250. The call is for $250.

Cash is the simplest. Deposit $250 and equity reaches $8,250. The loan and the stock stay as they were.

Depositing stock takes a little more. The new shares add to equity, but they also add a quarter of their value to the requirement, so only three quarters of each dollar you bring in counts toward closing the gap, and you would need $333.33 of fully paid marginable stock to clear a $250 call.

Selling takes the most, and the sum surprises people.

A sale cuts the market value and the debt by the same $1,000. Equity stays put. What falls is the requirement, by a quarter of whatever you sold, so you sell four times the shortfall. At a 30% house rate the multiplier drops to about 3.3, and at 50% it is 2, which is why higher requirements, painful as they are, make a forced sale smaller.

What the broker can do without you

Read the margin agreement’s section on liquidation. It will say, in some form, that the broker is entitled to liquidate whatever you hold, whenever it sees fit, with no duty to reach you beforehand, to protect its loan, and that it gets to choose which positions and how much. Any deadline is a courtesy.

That clause is what makes a call dangerous. You might plan to meet a call by selling the position you like least, and the broker’s system might sell the one you like most because it is the most liquid. It might sell more than needed. If selling everything still leaves part of the loan unpaid, you owe the rest.

How to avoid a margin call covers the buffers people use to stay clear of the line, and the margin call calculator finds the exact price where a given position would trigger one.

What people get wrong

Selling exactly the shortfall is the classic one. Another is expecting a notice before any sale. The agreement does not promise one. People also forget that margin interest is added to the loan each month, so an account that was fine at the start of a quarter can drift toward a call through interest alone. A lesson in Borrowed Money Has Teeth follows one call from notice to forced sale.

Related terms

Maintenance margin sets the level a call enforces. Initial margin is what a fed call enforces. Excess equity recorded in the special memorandum account can fund a purchase without triggering a fed call.