What is margin and a margin call?

Margin is the amount of your own money that a broker sets aside to let you open and hold a leveraged position. It is not a cost or a fee you pay away — it is more like a security deposit that is reserved while the trade is open and released back to you when you close it. Understanding this distinction is the first step to not being frightened by the word.

Because leveraged trading lets you control a position larger than your cash, the broker needs some of your money held as a buffer against losses. That reserved money is your margin. It is the mechanism that connects leverage to your account: the higher the leverage, the smaller the margin needed for a given position size.

A few related terms show up on every trading platform, and they are worth learning together. Your "balance" is the cash in your account before counting any open trades. Your "equity" is your balance adjusted for the current profit or loss on any open positions — it is what your account is really worth right now.

"Used margin" is the portion of your money currently reserved to hold your open trades. "Free margin" is what is left over — the equity not tied up as used margin, which is the cushion available to absorb losses or open new trades. When trades move against you, your equity falls, your free margin shrinks, and you get closer to trouble. Watching your free margin, not just your balance, is how you keep track of how much room you really have.

A margin call is a warning from your broker that your losses have eaten into your account so far that you no longer have enough equity to safely support your open positions. In effect, the broker is saying: "Your cushion is nearly gone. Add more money or reduce your positions, or we will start closing trades."

Brokers express the danger level using a "margin level" percentage — roughly your equity divided by your used margin. As losses mount, that percentage falls. Many brokers issue a margin-call warning at a set level (for example, 100%) and then, if things get worse, reach a "stop-out" level (for example, 50%) at which they automatically close your positions to stop your losses running past your deposit. The exact percentages vary by broker, so it is worth knowing yours.

Suppose you deposit €1,000 and open a position that requires €500 of used margin. That leaves €500 of free margin as your cushion. At this point your equity is €1,000 and your margin level is comfortable.

Now the trade moves against you and shows a €400 loss. Your equity drops to €600, your used margin is still €500, and your free margin has shrunk to just €100. Your margin level (€600 ÷ €500) is now about 120% — getting close to the level where a warning appears. If the loss grows to €500, your equity is €500, your margin level is 100%, and a margin call is likely. Let it slide further and the broker's stop-out will close the position for you, crystallising the loss.

The example shows how quickly a comfortable-looking account can turn tight. The larger your position relative to your deposit — that is, the more leverage you use — the smaller the market move needed to march you through a warning and into a forced close.

In some regulated regions, retail accounts come with "negative balance protection", meaning you cannot lose more than the money in your account even if the market gaps violently past the stop-out. Your balance can be taken to zero, but not below it. This is a genuinely important protection, and it is one of the reasons a properly regulated broker matters.

Not every broker, especially offshore ones, offers this. Without it, in a fast, gapping market it is possible to end up owing the broker money. Before you trade with real funds, it is worth checking whether your account has negative balance protection — it is the difference between a bad day and a genuinely ruinous one.

Margin calls are not a mysterious punishment; they are the predictable result of trading too large for your account. The way to avoid them is straightforward: keep your positions small, use modest leverage, and always leave plenty of free margin as a buffer. If a normal market move can push you toward a margin call, your position is simply too big.

A stop-loss on every trade also helps enormously, because it caps each loss before it can chew through your margin. Between small position sizes and disciplined stop-losses, most beginners can keep well clear of margin calls entirely. The traders who get stopped out are almost always the ones who used too much leverage and left themselves no room to be wrong.