Leverage, Margin and Liquidation Risk Explained

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Leverage allows a trader to control market exposure larger than the cash posted. It magnifies gains and losses equally, while margin and liquidation rules can force an exit before the trader's longer-term view has time to develop.

Learning objective

This lesson shows how to calculate notional exposure, translate a price move into account impact and understand why margin is not the same as maximum risk.

Exposure comes before leverage

Notional exposure = units × market price × contract multiplier

Effective leverage = notional exposure ÷ account equity allocated to the position

A £2,000 margin deposit controlling £20,000 of exposure represents ten times leverage on that allocated equity. A 1% adverse move in the underlying is approximately a £200 loss before costs, equal to 10% of the £2,000 margin. A 10% adverse move would consume the full margin in this simplified example, but liquidation may occur earlier and gaps can create a deficit.

Initial and maintenance margin

Initial margin is the amount required to open a position. Maintenance margin is the minimum equity required to keep it open. If losses reduce equity below the maintenance threshold, the broker or venue may request more funds, reduce the position or liquidate it automatically.

Rules can change during volatility. Cross margin may use other account assets to support the position, exposing more of the account. Isolated margin restricts collateral to a position but does not remove gap, fee or counterparty risk.

Worked example

Assume a hypothetical trader has £5,000 and opens £25,000 of exposure, or five times account leverage. A 3% adverse move creates a £750 market loss before spread, fees and financing. Account equity falls to £4,250, a 15% decline.

If the position is increased after the loss to recover quickly, the same percentage move has a larger cash effect. Leverage changes the speed at which normal market movement becomes an account-level problem.

Liquidation is not a stop-loss

A stop is part of the trader's plan. Liquidation is the venue's protection against an under-collateralised account. Its price can change with fees, funding, other positions and the venue's calculation method.

During a gap or fast move, a stop may fill badly and liquidation can occur at a worse price than expected. Some products permit losses beyond deposited margin. Never use the estimated liquidation price as the normal risk limit.

Funding and compounding costs

Leveraged positions may pay interest, overnight financing or periodic funding. These costs can accumulate even when price is unchanged. Funding may also reverse direction. Include the expected holding period and a stressed cost estimate in the plan.

Common mistakes

• Treating required margin as maximum loss.
• Calculating risk from deposit size instead of notional exposure.
• Using cross margin without recognising that other assets are exposed.
• Sizing a stop near the liquidation level.
• Ignoring funding, fees, spread and slippage.
• Adding leverage after a loss to accelerate recovery.
• Holding leveraged positions through known gap events without a plan.

Pre-trade checklist

• What is the full notional exposure?
• What cash loss results from a 1%, 3% or gap move?
• What are the initial and maintenance margin rules?
• Is margin isolated or cross-account?
• Where is the strategy invalidation, well before liquidation?
• What funding and financing may accrue?
• Can the account survive a worse fill than planned?
• Is total leverage across correlated positions included?

The Money Man lesson

Start with notional exposure and cash loss, then decide whether any leverage is justified. Keep the planned exit separate from the venue's liquidation threshold, include all correlated positions and assume that gaps can exceed the modelled loss.

Educational information only. The example is simplified and hypothetical. Leveraged trading can cause rapid losses, forced liquidation and, in some products, losses greater than deposited funds.