Leverage and Margin in Forex: How Margin Calls and Stop-Outs Work

Leverage in forex means controlling a position much larger than the money in your account, and margin is the deposit your broker holds against that position. In the US, retail forex leverage is capped at 50:1 on major currency pairs and 20:1 on others; in Canada, CIRO sets minimum margin by currency, which in its most recent published list works out to roughly 50:1 on USD/CAD and about 33:1 on pairs like EUR/CAD.

In short: margin is not a fee, it is collateral. Leverage does not change how far the price moves, it changes how much each move matters to your account. When losses eat into your margin, the broker first warns you (a margin call) and then closes your positions for you (a stop-out), usually at the worst possible moment.

A common misconception

Signal groups often say something like “you only need $500 to start, the broker gives you 500:1 leverage”. That sounds like the broker is lending you a cushion. It is better to think of it the other way round: the higher the leverage you actually use, the smaller the price move needed to wipe out your deposit.

The mechanics

Notional value and margin

Every forex position has a notional value: the full size of the trade. One standard lot of EUR/USD is 100,000 euros. At an exchange rate of 1.0850, that is worth $108,500.

The margin requirement is a percentage of the notional value. Leverage is just the inverse of that percentage:

Margin requirement	Maximum leverage
2%	50:1
3%	about 33:1
3.33%	30:1
5%	20:1

Equity, used margin and margin level

Three numbers on your trading platform matter:

Equity: your deposit plus or minus any open profit or loss.
Used margin: the collateral locked up by your open positions.
Margin level: equity divided by used margin, shown as a percentage.

As your open losses grow, equity falls while used margin stays roughly the same, so the margin level drops.

Margin call and stop-out

A margin call is a warning that your equity is close to, or below, the margin you need. Some brokers send it when the margin level falls to 100%.
A stop-out (also called margin close-out or liquidation) is the broker closing your positions automatically because equity has fallen too far.

The exact levels vary by broker and are in the customer agreement. In the EU and UK they are standardised for retail CFD clients: since 2018 (ESMA) and 2019 (FCA, permanently), brokers must close out positions once account equity falls to 50% of the margin required. US and Canadian rules set minimum margin but leave the liquidation policy largely to the firm.

The rules, as of November 2026

United States: CFTC and NFA

The CFTC’s 2010 retail forex rules require a dealer to collect a security deposit of at least 2% of notional value for major currency pairs and 5% for all others, set by the National Futures Association. That is the 50:1 and 20:1 cap. The NFA’s rule names ten major currencies besides the US dollar: the British pound, Swiss franc, Canadian dollar, Japanese yen, euro, Australian dollar, New Zealand dollar, Swedish krona, Norwegian krone and Danish krone.

These are floors. The NFA can and does raise them for particular currencies when volatility rises. After the Swiss franc shock in January 2015, for example, it raised the requirement on franc pairs to 5%, and it has adjusted others since. Brokers may also demand more than the minimum. More detail on the US framework is in are forex signal sellers regulated in the US.

Did the US cap make a difference?

Researchers have studied it. Rawley Heimer and Alp Simsek (“Should Retail Investors’ Leverage Be Limited?”, Journal of Financial Economics, 2019) compared US forex traders before and after the 2010 cap with traders elsewhere. They found the cap reduced trading volume by about 23% and cut the losses of the most heavily leveraged traders by about 40%, without changing the prices brokers quoted. In other words, the traders most constrained by the limit were the ones it helped most.

Canada: CIRO

In Canada, investment dealers that offer forex are regulated by the Canadian Investment Regulatory Organization (CIRO). Rather than one leverage cap, CIRO’s rules set a minimum spot risk margin rate for each currency, grouped by how volatile it is and whether the account is denominated in Canadian or US dollars. CIRO republishes the list when a currency’s volatility crosses a threshold.

In the most recent list we could find (effective August 13, 2025), the rate for US dollar against Canadian dollar positions was 2.00%, about 50:1, and for the euro and yen against the Canadian dollar 3.00%, about 33:1. Less traded currencies carry much higher rates. Check CIRO’s current list before relying on these figures, since they move. See forex regulation in Canada.

EU and UK, for comparison

ESMA’s 2018 measures, later made permanent in the UK by the FCA, cap retail leverage at 30:1 for major currency pairs and 20:1 for non-major pairs, gold and major indices, with lower limits for other assets.

Worked example: margin, margin call and stop-out

You deposit $3,000 with a US broker and buy one standard lot of EUR/USD at 1.0850. One pip is worth $10. (Hypothetical figures; we ignore the small change in required margin as the price moves.)

Item	Calculation	Result
Notional value	100,000 × 1.0850	$108,500
Required margin at 2%	$108,500 × 2%	$2,170
Free margin	$3,000 − $2,170	$830
Starting margin level	$3,000 ÷ $2,170	about 138%
Effective leverage on your deposit	$108,500 ÷ $3,000	about 36:1

Now the price falls.

Event	Equity	Loss	Price move needed
Margin level hits 100% (margin call at some brokers)	$2,170	$830	83 pips
Margin level hits 50% (a common stop-out level)	$1,085	$1,915	about 191 pips

An 83-pip move in EUR/USD is less than 1%. It can happen in a single day around a central bank decision. A 191-pip move is under 2%, and at that point the position is closed and you have lost about 64% of your deposit.

The same deposit, two lots

Try to open two standard lots with $3,000 and the required margin is $4,340, more than the account holds, so the order is rejected. An offshore broker offering 500:1 would allow it, with required margin of only $434. Every pip is now worth $20, a 1% move (about 108 pips) costs about $2,170, or 72% of the deposit, and roughly 139 pips takes the account to a 50% stop-out. High leverage does not make the stop-out come sooner; it lets a small account take a position that an ordinary day’s movement can mostly destroy before any stop-out happens.

What a 1% move means

At one lot on $3,000, a 1% move in EUR/USD is worth about $1,085, or 36% of the deposit. The useful number to know is not the leverage your broker allows but the effective leverage you are using: total position value divided by equity.

A Canadian example

The same arithmetic applies under CIRO’s rates, with one wrinkle: the rate depends on the currency, so the leverage changes from pair to pair. Using the rates in CIRO’s list effective August 13, 2025:

Position	Rate	Minimum margin	Implied leverage
100,000 US dollars against the Canadian dollar	2.00%	US$2,000	50:1
100,000 euros against the Canadian dollar	3.00%	€3,000	about 33:1

A trader in Canada following two signals of the same lot size, one on USD/CAD and one on EUR/CAD, therefore ties up 50% more margin on the second, and that difference shifts as CIRO revises its list. A dealer can also set its own, higher requirements.

How this connects to signals

A signal’s stop loss and the broker’s stop-out are two different things. If you size a trade so that the signal’s stop is well inside your margin, the stop should close the trade first. But if you trade several signals at once, or the market gaps past your stop, it is the margin rules that decide when you are closed out. The sizing arithmetic is in pips, lots and signal math.

What can go wrong

Stop-outs at the worst price. Brokers close positions automatically when your margin runs out, often during fast markets when spreads are wide.
Negative balances. If the price gaps far enough, a stop-out can fill below zero equity. EU and UK retail clients have negative balance protection on a per-account basis; in the US and Canada, check your customer agreement, because you may owe the broker the shortfall.
Margin requirements change. Regulators and brokers raise margin when volatility rises, which can push an existing position into a margin call without any price move against you.
Correlated positions. Several open trades share one pool of equity. A loss on one reduces the margin available to all the others.
Offshore leverage. Firms that offer 200:1 or 500:1 to North American clients are generally doing so outside the US and Canadian rules, which also means outside their protections.

The takeaway

Leverage is the reason forex accounts can be opened with small deposits, and the reason they can be emptied by ordinary price moves. Regulators cap it at 50:1 on majors in the US, set it currency by currency in Canada, and limit it to 30:1 in the EU and UK. Within those limits, the risk you actually take is set by your position size. Work out how many pips it would take to reach a margin call before you place any trade, signal or not.