Equity equals balance plus floating P&L

If you are serious about trading currencies on margin, you must internalize one equation above all others: equity equals balance plus floating profit and loss. This is not a theoretical concept reserved for a textbook. It is the single most important number on your trading platform because it determines whether your broker will close your positions automatically or let you ride a trade to profitability. The balance you see when you log in is a historical snapshot. Equity is the live, real-time report of what your account is worth right now, including every open trade that is either gaining or losing money. Understanding this distinction is foundational to managing margin requirements and avoiding the nightmare of a stopped-out account.

Your balance is simple. It is the sum of all your deposited funds plus any realized gains or losses from closed trades. It does not move while you have open positions. If you deposit ten thousand dollars and open a trade, your balance remains ten thousand dollars because the trade is still in play. The equity, however, changes every second. It is your balance adjusted by the current floating profit or loss of all open positions. If your trade is up five hundred dollars, your equity is ten thousand five hundred. If the trade is down five hundred dollars, your equity is nine thousand five hundred. This fluctuation is not academic. It dictates how much margin you have left.

Margin requirements are set by your broker as a percentage of the notional position size you wish to control. If you want to trade a standard lot of EUR/USD at a current exchange rate, the notional value might be around one hundred thousand dollars. With a margin requirement of two percent, you need two thousand dollars in equity to open that position. Once the trade is open, the margin requirement is locked. The broker holds that two thousand dollars from your equity as collateral for the duration of the trade. The remaining amount, your free margin, is the equity minus the margin used. If your equity drops and the used margin stays the same, free margin shrinks. Eventually, free margin can become zero or negative. That is the danger zone.

Here is where the equation becomes brutal. If your floating loss grows large enough to push your equity below the margin required to keep your positions open, your broker will issue a margin call. This is not a polite suggestion. It is an automated trigger. When equity falls to the margin call level, typically one hundred percent of the used margin, your broker will start closing your least profitable positions, one after another, until equity rises above the threshold. The process does not ask for your permission. It is designed to protect the broker from your losses, not to protect your account. A trader who ignores equity in favor of balance is a trader who will be liquidated without warning.

Consider a concrete example. You have a ten-thousand-dollar balance. You open a position with a two-thousand-dollar margin requirement. Your equity is now ten thousand dollars, your used margin is two thousand, and your free margin is eight thousand. The trade moves against you by three thousand dollars. Your equity drops to seven thousand. Used margin remains two thousand. Free margin is five thousand. You are still safe. But if the trade continues to a loss of eight thousand dollars, your equity becomes two thousand, which exactly equals your used margin. Free margin is zero. Any additional tick against you will trigger an automatic closure. The broker will not call you. The computer will simply execute the liquidation.

This is why advanced traders monitor equity constantly, especially during high-volatility news events. They do not look at balance and assume they are safe. They know that a series of losing trades can cascade rapidly. If you have multiple open positions, the situation compounds. Each position has its own margin requirement, and all of them draw on the same equity pool. If your equity drops, every open position becomes vulnerable at once. The broker does not close one trade and wait. It closes trades in order of highest loss to lowest loss, often creating a chain reaction that wipes out the entire account in seconds.

The relationship between equity and margin also determines your ability to open new trades. Brokers display a metric called margin level, calculated as equity divided by used margin, multiplied by one hundred. A margin level above one hundred percent means you have free margin. Below one hundred percent means you are in the red zone. Many brokers set a margin call level at one hundred percent and a stop-out level at fifty percent or lower. If your equity falls to fifty percent of your used margin, the broker will close all positions immediately. You receive no warning beyond the algorithm’s execution.

To manage this properly, you must treat equity as your true account size. Never base your position sizing on your balance alone, because balance does not account for the risk already in play. A trader with a ten-thousand-dollar balance and a nine-thousand-dollar floating loss has only one thousand dollars of equity. That trader cannot safely open any new position because the free margin is nearly exhausted. The smart move is to reduce exposure before equity deteriorates to that point. Set a personal equity floor, a percentage of your initial deposit below which you will close all trades and step away. This is not a broker rule. It is self-discipline.

The equation equity equals balance plus floating P&L is a relentless truth. It shows you the immediate financial reality of your account. If you ignore it, your broker will not. The platform updates equity in real time, and the margin system responds in real time. There is no grace period and no negotiation. Every trader who survives in forex learns to watch equity as a pilot watches fuel. Balance is what you started with. Equity is what you have right now. The difference between them is the difference between control and disaster.