A Margin Call is a warning from the trading platform that a client's account equity has dropped to the broker's minimum required margin level, meaning losing positions have eroded the buffer protecting them. The client must add funds or reduce exposure to avoid automatic liquidation.
Every leveraged position ties up a slice of the account as used margin. As open trades move into loss, equity — the account balance adjusted for floating profit and loss — falls. The platform tracks the margin level, calculated as equity divided by used margin, expressed as a percentage. When that percentage falls to the broker's margin-call threshold, the warning fires.
Key takeaways
A margin call is a warning; the stop-out is the actual forced liquidation.
Margin Level % = Equity / Used Margin × 100 drives both thresholds.
Common levels: 100% margin call, 50% stop-out (ESMA-style retail rules).
Over-leveraging is the usual cause, not 'market manipulation'.
Surviving traders out-earn blown accounts for the IB many times over.
The margin call is a warning, not the liquidation itself. If the market keeps moving against the client and the margin level falls further to the stop-out threshold, the platform begins automatically closing positions — usually the largest loser first — to protect both the client and the broker from a negative balance.
As a concrete example, a client deposits $1,000 and opens positions using $500 of margin. The broker's margin call is at 100% and the stop-out at 50%. As losses mount and equity falls to $500, the margin level hits 100% and the platform issues the margin call. If equity keeps sliding to $250, the level reaches 50% and the platform force-closes positions.
How it works
The platform recalculates the margin level continuously as prices tick. Margin level equals equity divided by used margin, times 100. When it reaches the broker's margin-call level — commonly 100%, though it varies — the account is flagged and the client is notified so they can deposit or de-risk.
If losses deepen and the margin level reaches the stop-out level — commonly 50% under ESMA-style rules, where retail brokers must close positions once margin falls to 50% of required margin — the platform auto-liquidates positions in sequence until the level recovers or the account is flat. This margin-close-out logic is what prevents most retail accounts from going negative.
1
Losing positions erode equity
Open trades move against the client, and floating losses pull account equity down toward the used-margin figure.
2
Margin level hits the call threshold
When equity divided by used margin reaches the broker's margin-call level (often 100%), the platform issues the warning.
3
Client must act
The trader deposits additional funds or closes losing positions to lift the margin level back to a safe range.
4
Stop-out if it worsens
If the margin level falls to the stop-out threshold (often 50%), the platform automatically closes positions, largest loser first.
Why it matters for partnership: Frequent margin calls among your referrals signal poor risk management and predict fast churn. A surviving, well-sized trader generates far more lifetime IB commission than one who blows their account, so educating leads on risk protects your own revenue.
Formula
Margin Level % = (Equity / Used Margin) × 100
Real World Example
An IB's client on Exness uses near-maximum leverage and hits a 100% margin call as EUR/USD turns against them; the terminal flashes red. Had the IB's free lot-sizing guide been followed, the position would have been a fraction of the size, the client would have absorbed the drawdown, and they would have kept generating volume and IB rebates instead of stopping out.
Margin call vs stop-out
Aspect
Margin Call
Stop-Out
What it is
A warning to act
Forced auto-liquidation
Typical level
Around 100% margin level
Around 50% margin level
Client action
Deposit or close positions
None — platform closes for you
Outcome
Recoverable if addressed
Positions closed, losses locked in
Pro Tip
Publish a free Risk Management Calculator on your affiliate site so leads can size lots correctly — it demonstrates you value their longevity over quick commissions and builds the trust that drives long-term referrals.
Common Pitfalls
Clients blaming the IB or broker for 'market manipulation' when a margin call was caused by over-leveraging — leaving this unaddressed breeds distrust and public complaints that scare off future leads.
FAQ
At what level does a margin call happen?
It varies by broker, but a margin-call level of 100% and a stop-out of 50% are common under ESMA-style retail rules. Always check the specific broker's thresholds.
Is a margin call the same as a stop-out?
No. A margin call is a warning to add funds or reduce exposure. A stop-out is the automatic closing of positions if the margin level keeps falling.
How can a trader avoid a margin call?
By using conservative lot sizes, setting stop-losses, keeping free margin, and not over-leveraging. Proper position sizing is the single biggest factor.
Does a margin call cost the IB money?
Not directly, but frequent margin calls lead to blown accounts and churn, which reduces the trading volume your commissions are based on.
Can a trader go negative after a margin call?
Margin close-out and negative-balance protection (required for retail clients under ESMA-style rules) are designed to prevent that, though extreme gaps can still be a risk without such protection.
Why did my client's positions close without a margin call warning?
In fast-moving or gapping markets the margin level can fall from safe to stop-out between ticks, so positions may close before a warning is practically actionable.
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