Direct answer
A worked example of a margin call shows, step by step, when an account’s equity (the value of funds plus floating profit or loss) falls below the margin required to keep open positions. The key inputs are the account’s initial balance, leverage, position size, the instrument’s price move, and any costs that reduce equity. Because exact margin rules and thresholds vary by provider, any example must state assumptions clearly and treat the numbers as illustrative.
Mechanism or definition
Margin is collateral a provider requires to support leveraged positions. Equity is typically:
- Equity = Balance + Unrealized profit/loss (floating P/L)
A margin call generally refers to the situation where equity is no longer sufficient relative to the provider’s required margin level. Providers set this using rules such as “required margin” and thresholds that trigger requests for additional funds or position reduction. If equity continues falling, some providers may proceed to additional risk controls (often described as stop-out or liquidation), meaning a margin call is not necessarily the last event before positions are reduced.
Evidence or example (fully numerical, with assumptions)
Assumptions (state every input)
Consider a simple scenario with one open long position.
- Account balance at start: $1,000
- Leverage: 10:1 (used to compute initial required margin)
- Instrument and contract value: assume a $100,000 notional position (so 10x leverage implies $10,000 notional / $1,000? To keep it consistent, we instead use a clearer construction below.)
To avoid confusion, use these explicit numbers: 4. Position notional (exposure): $50,000 5. Initial required margin: Notional / Leverage = $50,000 / 10 = $5,000 6. Provider triggers a margin call when equity < 80% of required margin.
- Required margin = $5,000
- Margin-call threshold = 0.80 × $5,000 = $4,000 equity
- No deposits or withdrawals during the test.
- Ignore interest and any additional fees for the illustration. (This is a limitation; real accounts often include costs.)
- Unrealized P/L responds linearly to price change (simplifying assumption).
Now choose a price path using a floating P/L mechanism.
Step-by-step timeline
Step A: after position opens (time t0)
- Balance = $1,000
- Unrealized P/L = $0
- Equity = $1,000 At t0, compare equity to required margin basis:
- Margin-call threshold = $4,000
- Equity ($1,000) is already below $4,000.
This outcome would imply a margin call immediately, which is not typical for many setups. The mismatch is caused by the initial balance being too low relative to the margin-call threshold. Adjust the example to align: increase initial balance.
Corrected scenario
Replace assumption (1):
- Account balance at start: $6,000
Recompute:
- Required margin = $5,000
- Margin-call threshold = $4,000
- Equity at t0 = $6,000 (above threshold)
Step B: adverse price move reduces equity Assume the position experiences an unrealized loss of $1,500.
- Unrealized P/L = -$1,500
- Equity = Balance + Unrealized P/L = $6,000 - $1,500 = $4,500
- Compare to threshold: $4,500 > $4,000 ⇒ no margin call yet.
Step C: further adverse move increases loss Assume the unrealized loss becomes $2,200.
- Unrealized P/L = -$2,200
- Equity = $6,000 - $2,200 = $3,800
- Compare to threshold: $3,800 < $4,000 ⇒ margin call is triggered (under the stated provider rule).
Step D: what happens next (illustrative, not guaranteed) At this point, the provider might request additional funds or require reducing exposure. If the price keeps moving against the position and equity drops further, risk controls such as stop-out can occur. Exactly when and how depends on provider-specific rules and execution.
Limitations and risks
- **Provider rules vary. ** The threshold used above (80% of required margin) is an assumption for illustration. Real margin-call and stop-out calculations differ by jurisdiction, account type, and provider settings. 2. **Costs can change the numbers. ** Spreads, commissions, financing/interest, and other charges reduce equity and can bring a margin call sooner than a simplified price-only model. 3. **Execution and timing are uncertain. ** A margin call is triggered by current equity and calculations at specific times; delays, partial fills, and price changes between updates can alter outcomes. 4. **A margin call does not cap losses. ** Even after a call, further losses can occur before positions are reduced, especially if markets move quickly. 5.