A trader opens a $10,000 account and applies 10:1 leverage on a currency position — controlling $100,000 of exposure. The market moves 2% against them. That is a $2,000 loss — 20% of their entire account — on a move that a conservative participant would barely notice. The bridge didn't fall because of bad luck. It fell because the load exceeded the design spec.

Leverage is simply borrowed exposure. A 10:1 ratio means every $1 of capital controls $10 of market position. At 20:1, a 5% adverse move wipes the account entirely. The maths is not ambiguous. Retail CFD platforms in Australia commonly offer 30:1 on major FX pairs — meaning a 3.3% move against you equals total capital loss at full utilisation.

CONCEPTLeverage ratio × position size = true market exposure — always calculate this number before entry.
WARNINGUsing maximum available leverage is not a strategy — it is a countdown to a margin call.
KEY IDEARisk per trade in dollar terms must be fixed before leverage ratio is selected — not after.

The standard professional rule is to risk no more than 1–2% of account equity per trade. On a $20,000 account, that is $200–$400 per position. If your stop-loss is 50 pips and each pip is worth $10 at standard lot size, maximum position is 0.4–0.8 lots — regardless of what leverage the broker offers. Leverage determines what you can do. Risk rules determine what you should do.

Account Loss from a 3% Adverse Move0%30%60%90%1:13%5:115%10:130%20:160%30:190%Leverage Ratio

Traders who survive long enough to compound returns treat leverage as a dial to be dialled down, not up. A fixed-fractional position sizing model — where exposure scales with account size — keeps the 1R loss constant regardless of drawdown depth. For deeper reading on how leverage interacts with margin requirements, the mechanics are covered clearly on Investopedia's leverage explainer, and the structural concept is well-documented on Wikipedia's leverage in finance article. The mathematics of account ruin under high leverage is formalised in Kelly criterion theory, which quantifies why overbetting destroys accounts even with a positive-expectancy system.

Leverage is a structural tool, not a performance enhancer. Size the risk first — then let leverage fill in the arithmetic.

This content is for educational purposes only and does not constitute financial product advice. Past performance is not indicative of future results. Profit Logic Ltd (ACN 688 669 936) accepts no responsibility for errors or omissions in this content or anywhere on this website. Always seek advice from a licensed financial adviser before making investment decisions.