In forex trading, leverage lets you control a position much larger than the money in your account, and margin is the collateral your broker locks to secure that position. They are two views of the same arrangement: leverage describes how many times your exposure exceeds your funds, and margin is the fraction of the position's value you must hold as a deposit.

Both are double-edged. Leverage does not increase the profit or loss generated by a position — the position size does that. Leverage reduces how much of your own cash is needed to open that position, which makes larger positions possible and brings your account closer to forced closure when prices move against you.

Position size and required margin

A standard lot in forex is 100,000 units of the base currency. If you trade one standard lot of EUR/USD with an account denominated in US dollars and EUR/USD trades at 1.10, your position controls roughly 110,000 US dollars of currency.

The required margin is the position's notional value divided by the leverage ratio:

• At 30:1, the required margin is 110,000 / 30 = 3,666.67 USD — about 37% of a 10,000 USD account.

• At 20:1, the same position requires 110,000 / 20 = 5,500 USD — 55% of that account.

This example is illustrative. It uses a fixed exchange rate for the conversion, and ignores spreads, commissions and overnight financing, all of which also affect your equity.

Two consequences follow directly. First, the same position can require very different margin depending on the leverage your account allows. Second, a smaller margin does not make the position safer: the pip value, and therefore the profit or loss per price move, is identical. A 100-pip move against this one-lot position costs about 1,100 USD either way.

Where leverage caps come from

Retail leverage limits are not a market convention — they are regulatory rules in major jurisdictions, and they vary by instrument.

In the European Union, ESMA's 2018 product intervention measures capped retail CFD leverage at 30:1 for major currency pairs, 20:1 for non-major pairs, gold and major indices, 10:1 for other commodities and non-major indices, 5:1 for individual equities, and 2:1 for cryptocurrencies.

The United Kingdom made equivalent rules permanent in COBS 22.5 of the FCA Handbook, applying from August 2019. Australia followed with ASIC's product intervention order, effective 29 March 2021, which sets the same 30:1 to 2:1 range by asset class.

These caps bind firms authorised in those jurisdictions. They are not universal. Entities licensed offshore may legally offer far higher leverage, and some do — which is one reason the contracting entity, not the brand name, determines the rules that apply to your account.

Margin level, margin call and stop-out

Your margin level compares your equity with the margin you are using. Brokers express it in different ways, but the underlying mechanism is what matters: as floating losses reduce your equity, your account moves toward a threshold where the broker intervenes.

In the EU and UK, the intervention threshold is standardised for retail CFD accounts. Under ESMA's measures and FCA COBS 22.5.9R, a firm must ensure a retail client's net equity does not fall below 50% of the total margin required to maintain the client's open positions — and when it does, the firm must close one or more positions as soon as market conditions allow.

The terminology in practice:

• A margin call (or margin warning) is a notification that your equity is approaching the threshold. It is informational.

• A stop-out is the forced closure of positions. Once triggered, your broker decides what to close and at what prices the market provides.

The exact warning and close-out levels are broker-specific and must be disclosed — under the FCA rule, firms must describe how the margin close-out level is calculated and triggered. Check the actual percentage in your broker's terms, and check when margin is recalculated. Some firms raise margin requirements before weekends or major events, which can move the close-out threshold closer than your routine calculations suggest.

What leverage does to risk

Working through the illustrative example above: with a 10,000 USD account, one standard lot EUR/USD at 30:1 needs 3,666.67 USD of margin. The close-out trigger at 50% of required margin means the position closes when equity falls to 1,833.33 USD — a loss of 8,166.67 USD, or roughly 742 pips. That is a large, but not extreme, move in an unfavourable market over days or weeks on an unhedged position.

Three points sit next to this arithmetic:

• Leverage magnifies position sizes, not the certainty of losses. The same one-lot position at 10:1 would consume 11,000 USD of margin — more than the account holds — so the account's own leverage limit also caps position size.

• Margin is not a fee. It is released back to you when the position closes. The costs of a trade are spread, commission and financing.

• Forced closure can happen at worse prices than the trigger. In fast markets or over gaps, slippage means the realised loss at stop-out can exceed the calculation. Negative balance protection, where it applies, is a separate safeguard that limits losses beyond your deposit — it does not prevent the stop-out itself.

Practical checks before you use high leverage

• Identify the contracting entity and its regulator. The maximum leverage, close-out rule and negative balance protection depend on the entity, not the brand.

• Read the margin close-out definition in the terms: the percentage, whether it is per account or per position, and when margin is recalculated.

• Check per-instrument margin schedules — a single account can apply 30:1 to majors, 20:1 to gold and 10:1 to other commodities.

• Size positions from the loss you are willing to accept on a price move, not from the maximum exposure the leverage allows. The maximum available leverage is a cap, not a target.

• Compare the broker's stop-out level with its margin call level. A broker that warns early gives you room to act; one that closes at the same threshold it warns at does not.

Frequently asked questions

Does higher leverage increase the loss on a given position? No. Loss on a position depends on its size and the price move, not on the leverage used to open it. Higher leverage reduces the margin needed, which makes it possible to open larger positions than your account can safely sustain. The danger is in what it permits, not in any additional charge.

What is the difference between a margin call and a stop-out? A margin call warns you that equity is approaching the required-margin threshold. A stop-out is the broker closing one or more of your positions because equity fell below the close-out level. Under EU and UK retail CFD rules, the standardised close-out trigger is 50% of the required margin for the account's open positions.

Is using less leverage always safer? Using lower leverage for the same position size changes nothing about the position's risk — it only requires more margin. What improves safety is holding smaller positions relative to your equity, and keeping free margin as a buffer against adverse moves. An account at 30:1 maximum leverage holding one small position can be less exposed than a 10:1 account stacked with positions.

The takeaway

Leverage and margin are accounting mechanics, not features to maximise. Leverage sets the ratio between exposure and collateral; margin is the collateral itself; the margin level determines when the broker closes your positions. The regulatory caps that exist — 30:1 to 2:1 for retail CFDs in the EU, UK and Australia — reflect how quickly leveraged positions can reach forced closure. Before trading, verify the rules attached to your specific contracting entity and account, and let position size follow from your acceptable loss, never from the leverage ceiling.