Open a trading account with $10,000. Use 10:1 leverage to buy $100,000 worth of shares. Then let the market fall 10% and you have lost 100% of your money. This is the danger of too much leverage in trading.
A 10% fall is an ordinary market correction. Since 1950, the S&P 500 has fallen 10% or more from a record close 26 times. Your $100,000 position is now worth $90,000, you still owe the broker the $90,000 you borrowed, and your account is worth zero.
Leverage in trading is sold as a way to make a small account behave like a big one, and that part is true. What the broker pages on the first page of Google spend far less time on is the arithmetic that comes with it. At 10:1, the market only has to move 10% against you to take everything, and your broker will usually close you out before it gets that far, unless the market moves too fast, in which case you might lose everything (and more).
I have been trading systematically for over 25 years, across the ASX, US, Canadian and Hong Kong markets. I use very little leverage, and I have watched plenty of traders use a lot and regret it later. This guide covers what leverage is, how it works with real numbers, the difference between margin and leverage, and where leverage hides in stocks, CFDs, futures and leveraged ETFs. Then it covers the section the brokers won’t write: how over-leverage blows up trading accounts, and how much leverage a systematic trader should actually use.
Leverage is one part of a bigger subject. My guide to risk management for traders covers the full set of controls that keep an account alive. Leverage is the setting that decides how big a market move your account can survive.
What Is Leverage in Trading?
Leverage in trading means controlling a position that is larger than the money in your account, either by borrowing the difference from your broker or by using a product that has the borrowing built in. Leveraged trading (also called leverage trading) is any trading done this way.
Leverage is quoted in two ways:
- As a ratio: 2:1, 5:1, 10:1. A 10:1 ratio means every $1 of your money controls $10 of position.
- As exposure: 200%, 500%, 1,000%. Exposure is the total value of your open positions as a percentage of your account equity.
The formula is the same either way:
Leverage = Total position value / Account equity
A $50,000 account holding $75,000 of open positions is running 1.5:1 leverage, or 150% exposure. The same account holding $50,000 of positions is at 1:1, which means no leverage at all. Holding $25,000 of positions, it is half in cash.
Two details catch traders out:
- Leverage is measured across the whole account, not trade by trade. Ten positions of 15% each is 150% exposure, even though no single position looks large.
- Longs and shorts add together. 100% long plus 50% short is 150% gross exposure. In a market rotation the long side and the short side can lose money on the same day, so the long and short exposure don’t always offset each other perfectly.
Your equity is what you would have left if you closed every position and repaid every dollar you borrowed. It is the number your broker watches, and leverage sets how fast it moves.
How Does Leverage Work in Trading?
Leverage works by applying every price move to the full position while every profit and loss lands on your equity alone. Your broker lends you the difference and holds your equity as collateral. If the position rises, the whole gain is yours, less interest. If it falls, the whole loss is yours too, and the lender gets repaid first.
Here is what that looks like on a $10,000 account:
| Leverage | Position size | Borrowed | Market rises 10% | Market falls 10% | Market fall that wipes you out |
|---|---|---|---|---|---|
| None (1:1) | $10,000 | $0 | +$1,000 (+10%) | -$1,000 (-10%) | 100% |
| 2:1 | $20,000 | $10,000 | +$2,000 (+20%) | -$2,000 (-20%) | 50% |
| 5:1 | $50,000 | $40,000 | +$5,000 (+50%) | -$5,000 (-50%) | 20% |
| 10:1 | $100,000 | $90,000 | +$10,000 (+100%) | -$10,000 (-100%) | 10% |
| 30:1 | $300,000 | $290,000 | +$30,000 (+300%) | -$30,000 (-300%) | 3.3% |
Before interest, commissions and slippage, all of which make the leveraged rows worse.
The last column is the one to remember. The market fall that wipes you out is 1 divided by your leverage. At 30:1, which is the most a retail client can get on a major currency pair CFD in Australia or Europe, a 3.3% move against you takes the lot.
A 10:1 Leverage Worked Example
Walk through the opening example one step at a time:
- You deposit $10,000.
- The broker lends you $90,000 against it, and you buy $100,000 of shares, or a CFD on $100,000 of an index.
- The market falls 10%. Your position is worth $90,000. Your loan is still $90,000. Your equity is $0.
- If the market falls 12% instead, your position is worth $88,000 and you owe $2,000 more than you ever deposited. In a margin account or a futures account, that shortfall is a debt you have to pay.
In practice most of the time you would not reach step 3 on your own terms because the broker would intervene (unless it is a fast market, and then all bets are off). The broker issues a margin call well before your equity hits zero, because at zero the broker’s own money is at risk.
On the way up, the same 10% move turns $10,000 into $20,000, and that +100% is the number in the advertising. The table is symmetrical in dollars, but your account is not, because a 50% loss needs a 100% gain just to get back to where you started.
What Is the Difference Between Margin and Leverage?
Margin is the money you put up as collateral. Leverage is the size of the position that collateral lets you control. In trading, they describe the same loan from two sides, and the margin vs leverage confusion disappears once you see that one is just the inverse of the other:
Maximum leverage = 1 / Margin requirement
| Margin requirement | Maximum leverage | Where you will see it |
|---|---|---|
| 50% | 2:1 | US stock margin accounts (Regulation T initial margin) |
| 20% | 5:1 | Retail share CFDs in Australia and Europe |
| 10% | 10:1 | Retail CFDs on most commodities and minor indices |
| 5% | 20:1 | Retail CFDs on gold, major indices and minor currency pairs |
| 3.33% | 30:1 | Retail CFDs on major currency pairs |
| 1% | 100:1 | Offshore forex and crypto platforms outside those rules |
There are two kinds of margin to know:
- Initial margin is the deposit you need to open the position.
- Maintenance margin is the minimum equity you must keep while the position stays open. Fall below it and you get a margin call.
What Happens in a Margin Call?
A margin call is your broker’s demand for more cash when your equity falls below the maintenance margin. If you don’t deposit it in time, the broker sells your positions for you, at whatever price the market offers. In a fast market, “in time” can mean the same day, and some brokers liquidate automatically with no call at all.
Here is a margin call worked through on a US stock margin account:
- You put in $10,000 and borrow $10,000, buying $20,000 of shares. That is 2:1.
- The maintenance margin is 25%, the FINRA minimum. Many brokers set 30% or more.
- The margin call arrives when your equity is only 25% of the position’s value. With a $10,000 loan, that happens when the shares are worth $13,333, a fall of 33%.
- At that point your equity is $3,333. You have lost two-thirds of your account on a one-third fall in the shares.
In early 2020, the S&P 500 fell 33.9% in 23 trading days, from its close on 19 February to its close on 23 March. That is past the 33.3% fall that triggers the call, so a 2:1 margin account on the index would have been called on closing prices alone. From October 2007 to March 2009, the index fell 56.8%.
A margin call arrives after the loss has happened, and from that point your broker decides how and when your positions are closed.
Where Does the Leverage Come From in Leveraged Trading?
Leverage in trading reaches a private trader through six main routes, and the last two are easy to miss.
Leverage in Stocks: Margin Accounts and Margin Loans
For most traders, leverage in stocks means a margin account or a margin loan. In the US, Regulation T lets you borrow up to 50% of a stock’s purchase price, which caps a standard margin account at roughly 2:1 overnight. In Australia, margin lenders set a loan-to-value ratio for each approved stock, with the highest ratios on large, liquid companies and nothing at all on many small caps. Either way, you pay interest on the borrowed amount every day you hold the position.
CFDs and Forex
A CFD (contract for difference) has the leverage built in. You post margin and the provider finances the rest. Retail CFD leverage has been capped in Europe since 2018 and in Australia since 2021, at between 30:1 and 2:1 depending on the asset, and retail accounts carry negative balance protection, so you cannot lose more than you deposited.
That protection caps your loss at your entire account. It does nothing to stop you reaching that cap. The caps exist because regulators looked at the results. UK and EU CFD providers must publish the percentage of their retail accounts that lose money, and four of the largest showed between 68% and 73% in October 2026. In Australia, ASIC found that 68.42% of retail CFD clients realised a net loss in the 2024 financial year. The regulator studies behind those numbers are collected in my guide to what percentage of traders lose money.
Futures and Options
A futures contract only requires you to post initial margin, often in the range of 5% to 15% of the contract’s value. That is roughly 7:1 to 20:1 leverage built into every contract you hold. Options carry leverage too. Buying an option is leverage with the loss capped at the premium you paid. Selling uncovered options is leverage with no cap at all.
Leveraged ETFs
A 2x or 3x leveraged ETF does the borrowing inside the fund and resets its exposure every day. You can’t get a margin call on one, but the daily reset produces volatility decay, which can cost you money even when the index goes nowhere. I cover the mechanics and the decay maths in my guide to how leveraged ETFs really work. Note that the layers stack: a 3x fund bought in a margin account at 2:1 is 6x exposure to the index.
Hidden Leverage: Short Positions and High-Beta Stocks
Short positions count. Every short adds to your gross exposure, and a short squeeze can hit at the same time as a fall in your longs.
High-beta stocks count too. A stock with a beta of 2 has historically moved about twice as far as the market, so a portfolio full of them tends to fall roughly 20% when the market falls 10%. That is the same effect as 2:1 leverage on the index, without a dollar borrowed. Concentrated high-beta portfolios were among the hardest-hit casualties of the 2008 crash, and it is one reason my trend-following systems give priority to lower-volatility stocks.
Why Is Too Much Leverage Dangerous?
Too much leverage in trading is dangerous because it shrinks the market move your account can survive, it grows on its own as you lose, and it hands the timing of your exit to your broker. Broker pages explain how leverage works and then cover the danger in one line of risk warning at the bottom of the page. Here are the 6 reasons leverage in trading is so dangerous.
1. Ordinary Market Moves Become Fatal
Go back to the rule: the fall that wipes you out is 1 divided by your leverage. Now line that up against moves that have already happened:
- 19 October 1987: the Dow Jones fell 22.6% in a single day. At 5:1, that one session took everything, with no chance to act.
- March 2000 to October 2002: the Nasdaq Composite fell 77.9% from peak to trough.
- October 2007 to March 2009: the S&P 500 fell 56.8%. At 2:1, that is a wiped-out account with debt left over.
- February to March 2020: the S&P 500 fell 33.9% in 23 trading days.
Funds and commentators like to call moves like these five sigma events, as if they were too rare to plan for. My translation is simpler: a bad thing that could happen, did. Tail events turn up in markets far more often than the statistics say they should, and at some point there will be a crash bigger than anything in your backtest. Your leverage has to survive that one.
2. Leverage Increases on Its Own as You Lose
Start at 5:1 on a $10,000 account: a $50,000 position and a $40,000 loan. The market falls 10%. Your position is now $45,000, your loan is still $40,000, and your equity is $5,000.
Your leverage is now 9:1, without you buying a single share. The next fall that wipes you out is 11%, not 20%. Every loss raises your leverage and makes the next loss bigger as a percentage of what you have left. The only way to bring it back down is to sell, and selling after a fall locks in the loss.
3. Stop Losses Don’t Protect You From Gaps
A stop loss is an instruction to sell at the next available price. When a stock gaps down overnight on bad news, the next available price can be far below your stop. Over my trading career I have had four or five positions go to zero, out of thousands of trades, and I have had a strategy whose worst backtested trade was -30% deliver a live trade worse than -50%. That is why I say your greatest loss is always in the future.
Leverage multiplies the damage from a gap like that. Hold a position worth 25% of your account, which is easy to reach at high exposure, and a 50% overnight gap costs you 12.5% of your account, straight through a stop you thought limited the loss to 2%. So please don’t depend on a stop loss protecting you from the dangers of high leverage in your trading.
4. Margin Calls Sell Your Positions at the Bottom
The broker closes your positions after prices have fallen, because that is when your equity drops below maintenance, and in a crash that is often close to the bottom. You take the loss and then miss the recovery. The S&P 500 closed above its February 2020 high on 18 August 2020. A trader who was margin-called in March sold near the bottom and watched the rebound from the sidelines with a fraction of their account.
5. Interest Costs Eat Your Edge
You pay interest on every borrowed dollar, every day, whether the trade works or not. At an illustrative 7% a year:
| Leverage | Borrowed per $10,000 of equity | Annual interest at 7% | Cost as % of your equity |
|---|---|---|---|
| 1.3:1 | $3,000 | $210 | 2.1% |
| 2:1 | $10,000 | $700 | 7% |
| 5:1 | $40,000 | $2,800 | 28% |
| 10:1 | $90,000 | $6,300 | 63% |
At 5:1, your system has to make 28% a year on your equity just to cover the interest. At 1.3:1 the interest is a small drag. At 5:1 or more it needs an edge almost no trading system has.
6. Leverage Multiplies the Drawdown You Have to Sit Through
Leverage scales your drawdowns roughly in line with the leverage. A system with a 20% maximum drawdown becomes a system with a drawdown of around 40% at 2:1. Very few traders keep following their rules through a 40% fall, and the usual result is abandoning a good system at the worst moment. My guide to drawdown in trading covers what causes drawdowns and how to reduce them (Hint: Reduce your leverage!).
The risk is highest straight after a run of early wins. A trader said this to me on a call: “I didn’t know what I didn’t know… and that inflated my confidence in a dangerous way, especially if you get a few good wins under your belt.” Early wins on leverage feel like skill, so the leverage goes up, and one bad month at the higher leverage takes back the wins and more. Make 200% this year with heavy leverage, lose 100% next year, and you are at ZERO. The 200% you made the previous year is GONE.
Two Traders I Knew Who Lost Everything to Leverage
I had a friend who made $6 million trading stocks. Three weeks later he was at minus $300,000. He owed his broker and had to mortgage his house to pay it back.
You cannot end up below zero trading stocks with your own money. The worst a share can do is go to zero. Getting from $6 million to minus $300,000 in three weeks takes borrowed money, and enough of it that an ordinary fall in the market was bigger than his equity.
I also met a trader who had learned to trade from an options guru and was making $40,000 a month. He was living off his trading and driving a Ferrari he had bought with a loan secured against his trading income. Every time I saw him, he told me how well it was going and how becoming a trader was the best decision he had ever made.
His strategy was selling out-of-the-money put options on individual stocks, with leverage. A strategy like that wins almost every month, and every winning month makes it feel safer to add more leverage. Then a stock gapped down through his strike price, and one trade wiped out the account. The Ferrari and other things were repossessed, and he gave up trading.
A high win rate with leverage behind it looks like proof for months. The big loss arrives after those months have pushed the leverage to its highest point, and it takes the profits and the capital together.
Professional Managers Have Made the Same Mistake With Bigger Numbers
These funds had risk teams, compliance departments and long track records, and they were run by supposedly capable professionals who should have known better:
- Long-Term Capital Management (1998): two Nobel Prize winners on the team, leverage of roughly 25:1, and about $4.6 billion lost in less than four months.
- Carlyle Capital (2008): $21.7 billion of AAA-rated agency mortgage bonds against $670 million of equity, around 30:1. The bonds ultimately paid off, and it made no difference: when lenders asked for more collateral, the fund didn’t have it, and the lenders seized and sold the portfolio within a fortnight.
- Archegos (2021): about five times leverage on a concentrated book. Margin calls arrived from every bank at once, and around $20 billion was gone in two days.
When I went through 62 hedge fund blow-ups for my hedge fund graveyard, leverage was part of the story in 31 of them. In every one of those funds, the leverage was a decision someone made. If a fund with a risk committee and decades of experience can get this wrong, a private trader with nobody checking their exposure should not be using leverage like this unless they want to blow up and lose everything.
How Does Leverage Affect Position Sizing, Drawdown and Risk of Ruin?
Leverage in trading comes straight out of your position sizing: it is what you get when your position sizes add up to more than 100% of your equity.
Take a common setup: risk 1% of equity per trade, with a 20% initial stop loss. The position size is 1% divided by 20%, which is 5% of your equity per position.
- 20 open positions at 5% each is 100% exposure. No leverage.
- 26 open positions is 130% exposure, or 1.3:1.
- Raise the risk per trade to 2% and each position doubles to 10%. Twenty of them is 200% exposure, or 2:1, from the same system rules.
So every time you raise your risk per trade or the number of positions you allow, you are raising your leverage. My guide to position sizing covers the three sizing models I test and how to choose between them.
Leverage also feeds straight into risk of ruin, the probability that a run of losses takes your account below the point where you can keep trading. Most risk of ruin calculations assume your trades are independent. In a market-wide sell-off they aren’t. Your positions fall together, and leverage multiplies that combined loss. You can test your own numbers in the free risk of ruin calculator, which accounts for how many positions you hold at once and how correlated they are. Run the same system at different risk-per-trade settings and watch how fast the ruin probability climbs. It is scary how quickly risk of ruin increases as you add leverage to your portfolio!
One warning for anyone backtesting: your optimiser will always push leverage up. More leverage produced a higher return in the historical data you tested, and the optimiser has no idea that your worst drawdown is still ahead of you. Treat leverage as a decision you make after the system is finished, never as a parameter to optimise.
How Much Leverage Should a Systematic Trader Use?
None while you are learning. For an experienced trader running a diversified portfolio of tested end-of-day systems, keep leverage below 1.5:1, or 150% exposure. I consider 2:1 very aggressive for a portfolio of stock trading systems, and traders who run 5:1 or 10:1 will blow up their accounts eventually.
My own portfolio runs at about 130% maximum long exposure. When I add short systems, I think in gross terms: 130% long plus 50% short is 180% gross exposure, so I scale both sides down, often to around 140% in total.
This is the process I use to set it:
- Backtest every system with no leverage. Each system is tested at a maximum of 100% exposure, using cash only.
- Combine the systems into a portfolio and set the capital allocation for each one.
- Scale the whole portfolio up or down with a single multiplier. I don’t add leverage to individual systems.
- Check the maximum exposure on every day of the backtest history, not the average. That maximum has to stay below what your broker allows before a margin call.
- Ask the two worst-case questions. What is the worst that could happen to a single position at this size, and can I live with it? What is the worst that could happen to the whole market at this leverage, and can I live with that? If either answer is no, cut the size.
- Run a Monte Carlo simulation and look at the worst outcomes, not the median. If the worst result is something you could not live with, financially or emotionally, you are carrying too much leverage, whatever the backtest summary says.
Is Leverage Ever Worth Using?
Yes, leverage in trading is worth using in small amounts, mainly for capital efficiency across a portfolio of systems. A mean reversion system can sit in cash most of the time, and a crash-protection system might fire only a handful of times in a decade. Because the systems rarely all use their capital at once, the capital allocations across a portfolio can add up to more than 100%. A modest margin facility covers the days when several systems are fully invested together. The number I cap is total maximum exposure, not the sum of the allocations.
That is a very different use from adding leverage to a single system to get bigger returns. Leverage multiplies whatever edge the system already has, including its losses, so a system with no edge loses money faster with leverage than without it. Adding uncorrelated systems lowers the drawdown of the whole portfolio, which raises your return for each unit of risk without borrowing anything.
You do not need leverage to build wealth through trading. Build the portfolio first, with no leverage, and only add it when the maximum exposure on the worst day of your backtest would still leave you trading the next morning.
Frequently Asked Questions About Leverage in Trading
What Does Leverage Mean in Trading?
Leverage in trading means controlling a position larger than your account by borrowing the difference or by using a product with built-in borrowing, such as a CFD or futures contract. It is expressed as a ratio, like 5:1, or as exposure, like 500% of your equity.
How Does Leverage Work in Trading?
Leverage applies every price move to the full position, while every profit or loss directly impacts your equity. At 10:1, a 10% rise doubles your account and a 10% fall wipes it out. Remember that the market fall that takes your whole account is 1 divided by your leverage.
What Is the Difference Between Margin and Leverage?
Margin is the collateral you deposit, and leverage is the position size that collateral controls. A 10% margin requirement allows 10:1 leverage, and a 50% margin requirement allows 2:1. Maximum leverage equals 1 divided by the margin requirement.
How Much Leverage Should a Beginner Use?
None. Learn to trade with cash first, using a tested system, until you have live results to compare against your backtest. Experienced systematic traders running a diversified portfolio of systems should still keep leverage below 1.5:1 in most cases.
Can You Lose More Than You Invest With Leverage?
Yes. In a margin account or a futures account, a large enough fall that happens quickly can absolutely leave you owing the broker more than you deposited. Retail CFD accounts in Australia and Europe carry negative balance protection, which caps the loss at your entire deposit. While it is a good thing that you can’t lose more than your initial deposit, losing everything in your account is still an absolutely devastating situation that will set you back years on your wealth building journey. Traders should avoid blowing up their account at all costs!
Is 10:1 Leverage Dangerous?
Yes. At 10:1, a 10% move against you wipes out your account, and a margin call will not necessarily close you out before that. You can lose more than the value of your account in a fast market. Since 1950, the S&P 500 has fallen 10% or more from a record close 26 times, and the Dow fell 22.6% in a single day in October 1987.
Build a Portfolio That Doesn’t Need Leverage
The traders who last in this game build a portfolio of tested, uncorrelated trading systems, size every position from the backtest, and never let their broker’s leverage limit determine their exposure.
That is what the Trader Success System teaches. You learn to build and backtest end-of-day trading systems, combine them into a portfolio, set position sizing and capital allocation from the evidence, and check the worst case before you risk a dollar. Five to ten minutes a day, end of day, with your exposure set by rules you tested in advance.
Remember – you are only one trading system away!
