Leverage does not multiply your returns. It multiplies your exposure
The distinction sounds pedantic until you look at what percentage losses require to recover, at which point it becomes the only thing that matters.
What does 30:1 actually mean?
One pound of your money controls thirty pounds of exposure, and thirty to one is the retail ceiling the FCA sets on the major currency pairs. The ladder steps down from there: 20:1 for non-major pairs, gold and the major indices; 10:1 for other commodities; 5:1 for single equities; and 2:1 for cryptocurrency.
The common description, that leverage multiplies your returns, is true only in the direction people are thinking about. It multiplies the outcome, whichever sign it has, and it does so on a base you did not put up. That is why the arithmetic of recovery gets ugly so quickly.
Why is a 50% loss worse than a 50% gain is good?
Because they are not symmetrical, and this is the single most useful piece of arithmetic in trading. Lose 50% and you need 100% to get back. Lose 20% and you need 25%. Lose 80% and you need 400%. The percentage required to recover rises far faster than the percentage lost.
How far up that curve does leverage take you?
Leverage moves you up that curve quickly. A 3% adverse move on a 30:1 position is approximately a 90% loss of the margin committed, which requires roughly a 900% gain to recover. Three percent is a large day in a major currency pair and an unremarkable one in a single equity or a commodity, which is why the caps step down for those.
| Loss taken | Gain needed to recover | Adverse move at 30:1 that causes it |
| 10% | 11% | about 0.33% |
| 25% | 33% | about 0.83% |
| 50% | 100% | about 1.67% |
| 75% | 300% | about 2.5% |
| 90% | 900% | about 3% |
Recovery arithmetic set beside the underlying move needed to produce it at maximum retail leverage, which is the case for position sizing in one place. The bottom two rows describe what the 50% close-out rule exists to prevent rather than ordinary outcomes: on a funded retail account they are reachable mainly through a gap, and the next section sets out why.
What does the close-out rule do to this?
It intervenes before the worst rows are reached, which is its purpose. FCA rules require brokers to begin closing positions when equity falls to 50% of required margin, and negative balance protection ensures a retail client cannot end up owing money. Both are real protections and both were hard won.
Neither improves the recovery arithmetic. They cap the loss at your deposit and crystallise it at a defined point. Being stopped at 50% rather than 90% means needing 100% rather than 900%, which is better and is still a very difficult hole to climb out of.
Where does financing fit?
It compounds the problem quietly, because it is charged on the full notional while your risk is measured against the margin. Live testing in July 2026 recorded overnight financing of about GBP 7.10 a night on a standard long EUR/USD lot. At 30:1 that lot sits on roughly GBP 3,300 of committed margin, so the nightly charge runs at about a fifth of one percent of the money you actually put up. Compound that across a month and it is roughly 6% of the committed margin, before counting the Wednesday charge, which the same testing found is tripled to cover weekend settlement and takes the monthly figure nearer 8%.
None of that depends on the market doing anything. It is the price of the waiting, and it scales with the leverage rather than with the view.
So how much leverage should you use?
Less than you are allowed, which is the only general answer that survives contact with the arithmetic above. The regulatory cap is a maximum imposed on the industry, not a recommendation to the individual, and treating it as a default is how accounts reach the bottom rows of that table.
A more useful way to size is backwards from the loss you can absorb. Decide what a bad outcome looks like in pounds, work out what move would produce it, and set size so that an ordinary adverse move does not get you there. The mechanics are set out at theinvestorscentre.co.uk/trading/what-is-leverage-in-trading/, published by a site that pays for its own testing rather than ranking platforms by the commission they offer.
Treat that page as a rules explainer, because that is what it is; the funded-account work sits behind the cost figures, not behind the leverage ladder.