Margin Trading: Definition, Equity, Free Margin, Margin Level, Margin Call & Risk

Margin: What It Means

Margin is the good-faith deposit you lodge with your broker to open/maintain positions. It’s a fraction of your trade’s notional value and is expressed as a percentage. Required margin also implies the maximum leverage available (e.g., 5% margin ↔ 1:20 leverage). Using leverage magnifies both profits and losses—manage it carefully.

Leverage & Required Margin

LEVERAGE = 1 / MARGIN%

• If leverage is 1:20, required margin is 5%.
• If required margin is 10%, max leverage is 1:10.
  Example: Notional trade value $20,000 with 1:20 → required margin $1,000.

Equity, Used Margin & Free Margin

• Balance: cash in the account (closed P/L only).
• Equity: Balance ± Open P/L.
• Used Margin: total margin tied to open positions.
• Free Margin: Equity – Used Margin (what’s available to open new trades).
  Example (balance $1,000, margin 5%, position $8,000):
  Used Margin = $400; Equity initially $1,000; Free Margin $600.
  If open P/L = +$50 → Equity $1,050, Free Margin $650. If –$50 → Equity $950, Free Margin $550.

Margin Level, Margin Call & Stop-Out

Margin Level shows account health:
Margin Level % = (Equity / Used Margin) × 100.

• 0%: no open trades.
• 100%: Equity equals Used Margin → typically cannot open new trades.
• Margin Call: broker alert when Margin Level falls to a warning threshold (varies by broker, e.g., 50% or 80%).
• Stop-Out: at a lower threshold (e.g., 30%), broker starts auto-closing positions—largest exposure first—to restore Margin Level.

When Does a Margin Call Happen?

RISK CONTROLS

A call occurs when Free Margin ≤ 0 (i.e., Equity ≤ Used Margin) or when the broker’s Margin Level threshold is breached.
Rule of thumb:
Balance – Open Loss < Required Margin ⇒ Margin Call risk.

Best Practices & Regulations

• Position sizing: risk ~2.5–5% of capital per idea.
• Always set Stop-Loss; don’t average into losers.
• Limit concurrent positions to avoid tying up margin.
• Choose appropriate leverage (higher isn’t better).
• Monitor around news—volatility can compress equity quickly.
• Know your region’s limits: e.g., retail caps like 1:30 FX (margin 3.33%) vs professionals up to 1:500 (margin 0.2%) in some jurisdictions.
• Practice on a demo to learn how equity/free margin behave in real time.