Here's a thought experiment I keep coming back to, because it's the cleanest way I know to explain what leverage really does. Two traders take the identical long at 100. One uses no leverage. The other uses 3x.
Price drops to 70, then recovers to 130. The first trader sits through a 30% drawdown and ends up 30% richer. The second trader never sees 130.
Where the 3x account goes
At 3x, a roughly 33% adverse move wipes out your margin before you even count fees and maintenance requirements. So in practice a 30% dip is the end of the position. The exchange closes it for you before price ever touches 70, and the recovery happens without you.
Same market. Same signal. Same entry. The only difference was how much room the position had to be wrong on the way to being right.
Notice what didn't change. Nobody got smarter or dumber between the two accounts. Nobody misread the chart.
That's the part people miss. Leverage doesn't make a good strategy more profitable. It makes the strategy's timing matter more than its edge.
The quieter version of the same problem
You don't need a liquidation for this to hurt. Take a choppy market that goes up 10%, down 10%, up 10%, down 10%. Unleveraged, you end at about 0.98 of your starting equity (1.1 × 0.9 × 1.1 × 0.9). A small loss.
At 3x the moves are +30% and -30%. The same four swings leave you at about 0.83. That's a 17% loss from a market that went nowhere. Leveraged returns compound from a smaller base after every down leg, so volatility eats you faster than the headline multiplier suggests.
Every number here is illustrative, not from a backtest. But the arithmetic doesn't care.
Why most traders get it wrong
Most traders think of leverage as a volume knob. Turn it up, get more of the same result. I believed that for longer than I'd like to admit.
It isn't a volume knob. It's a filter on which paths you survive. Two sequences of returns can have identical averages and end in very different places, and leverage decides which of them you're allowed to finish.
This might just be me, but I think this is why so many traders can show you a great signal and a ruined account. The signal was right about the destination. The leverage was wrong about the road.
What I'd check before turning it up
Ask a question most position-size calculators never ask. What is the worst drawdown this strategy has taken before the payoff, and how many times larger does leverage make it?
If your backtest shows a 25% peak-to-trough dip on the way to a profit, then 3x means you must be able to survive a 75% hit. Most accounts can't, and most people can't stomach it even when the account can.
So size the leverage to the dip, not to the destination. If the path needs 25% room, give it 25% room. A strategy that earns less but survives its own drawdown beats one that earns more on paper and gets liquidated in practice.
Where this leaves a systematic trader
A rule-based system can't talk itself out of a bad moment, which is its strength. It also can't talk itself out of a liquidation. Whatever leverage you hardcode is the leverage that meets the worst week, so that number deserves more thought than the entry signal does.
One last thing
At v33 Systematic we run conservative leverage for exactly this reason. The strategy's edge shows up over years, and the account has to still be there when it does. The full drawdown history is public at v33systematic.com.