Margin and Margin Calls: What Every New Trader Must Know
Margin is the collateral your broker holds against your leveraged positions. Understanding how margin is calculated — and how margin calls and stop-outs actually fire — is the difference between trading sustainably and watching an account vanish during volatility.
- Margin is the deposit your broker requires to open a leveraged position — typically calculated as 1/leverage of position size
- Free margin is your account equity minus the margin already used by open positions
- Margin level (equity ÷ used margin × 100%) is the key health metric — most brokers margin-call below 100%
- Stop-outs auto-close positions to protect the broker from your losses spilling past your deposit
What is margin?
Margin is the portion of your account balance that the broker sets aside as collateral while you hold an open position. It is not a fee or commission — it's locked-up capital that you get back when the position closes.
Margin amount depends directly on leverage: margin = position size ÷ leverage. Example: 1 standard lot of EUR/USD (100,000 units) at price 1.0850 = $108,500 of currency exposure. At 1:30 leverage, margin required = $108,500 / 30 = $3,617.
Balance, equity, used margin, free margin
Your broker platform shows four key numbers:
- Balance — your account cash, not counting unrealized P&L
- Equity — balance plus or minus unrealized P&L on open positions
- Used margin — total margin locked up by current open positions
- Free margin — equity minus used margin; what's available for new trades
If you have $5,000 balance, one position with $1,500 of margin locked, and the position is up $200, then: Equity = $5,200, Used margin = $1,500, Free margin = $3,700.
Margin level — the health metric
Margin level is the single most important account-health number:
Margin level = (Equity ÷ Used margin) × 100%
At 200% margin level, you have twice as much equity as used margin — comfortable. At 100%, your equity exactly equals used margin — borderline. Below 100%, the broker starts taking action.
Margin calls — the warning
A margin call is the broker's warning that your margin level has dropped below a threshold. Different brokers set this at 100%, 80%, or 50%. The platform notifies you (alert, email, SMS) that you need to either:
- Deposit additional funds to restore margin level
- Close some positions to release used margin
If you don't act and losses keep growing, the next step is the stop-out — and you don't get to choose which positions close.
Stop-outs — the auto-close
A stop-out happens when margin level falls below the broker's hard threshold (typically 20-50%). At that point, the broker automatically begins closing your largest-losing positions, one by one, until margin level recovers above the stop-out threshold.
This is brutal in practice:
- Positions close at the worst available market price during volatile moves
- You don't get to choose which positions are closed — the broker picks
- In a fast-moving market, stop-outs can cascade — closing one position causes margin to recover briefly, then drops again as remaining positions move further against you, triggering more closes
Negative balance protection
In rare circumstances — large gaps, flash crashes, or stop-outs that fail to execute fast enough — your losses can exceed your deposit. Without protection, you'd owe the broker the difference. With negative balance protection, the broker absorbs the excess loss; your account goes to zero but no further.
Negative balance protection is mandatory at FCA, CySEC, ASIC, and ESMA-regulated brokers. Many offshore brokers offer it voluntarily, but not all. Worth checking before opening an account.
How to manage margin sustainably
The disciplined approach to margin:
- Never open positions that bring margin level below ~300% — leaves comfortable buffer for adverse moves
- Watch margin level during news events — spreads widen, P&L swings, margin level moves accordingly
- Don't add to losing positions to 'average down' — increases margin used while equity is falling, fastest path to stop-out
- Close positions one by one, not all at once — manual position management beats algorithmic stop-outs
Most blown accounts share the same pattern: increased position size while losing, then a single move trips the stop-out cascade.
How leverage and margin interact
Higher leverage means less margin required per position, which sounds attractive — until you realize what it does to your safety buffer.
Example: $1,000 account, 1 standard lot EUR/USD ($108,500 exposure):
- At 1:30 leverage: margin = $3,617 — you can't even open the position
- At 1:500 leverage: margin = $217 — comfortably affordable
- But at 1:500, a 0.2% adverse move = $217 loss = entire margin gone
Higher leverage = lower required margin = lower buffer = faster stop-outs. The trade-off is real and unavoidable.
Frequently asked questions
What happens if my margin level drops below 100%?
The broker either margin-calls you (warning) or starts closing positions (if at stop-out threshold). Most brokers margin-call at 100% and stop-out at 20-50%.
Can I add funds during a margin call?
Yes, if the deposit clears quickly. Crypto deposits (USDT) clear in minutes; bank wires can take hours. During fast moves, you may not have time before stop-out triggers.
Do I need to close every position to get my margin back?
No — margin releases per position. Closing one releases its margin and increases your free margin. Used margin is the sum across all open positions.