Trading plan · Intermediate

Defining Your Risk Tolerance And Capital Allocation

Fix how much capital belongs in the account and what drawdown ends the experiment, then derive everything else from the second number.

Last reviewed 15 September 2026 by the MarketPro research desk · Editorial policy

In short

Defining risk tolerance means fixing two numbers before the first trade: the capital that genuinely belongs in the account, and the drawdown at which you would stop and review. The per-trade percentage is then derived from the second figure rather than chosen independently. Trading capital should be money whose absence would not change your month, since capital under time pressure produces oversized positions near the deadline.

What to remember

At 5% risk per trade, the losing run that breaches a 20% account ceiling arrives about every 42 trades. At 1% it is rare enough to ignore.
A per-trade percentage with no account-level ceiling is an unbounded loss, because nothing in the sizing rule says when to stop applying it.
A $500 account asked for $200 a month needs 40% a month, which sizing cannot supply. The gap closes by lowering the demand or raising the capital.
Stated tolerance is usually 20% or 30%; measured tolerance is whatever you actually did at 8%, and that is the number the plan must be built around.
Margin close-out is a protection for the broker, not a risk ceiling for you, and it fires far below any level worth discovering.

Lesson 12 of 14 in Building a trading plan

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Two numbers, settled before the first order

Defining risk tolerance means fixing two figures and writing them down: how much capital genuinely belongs in the account, and what depth of drawdown would end the experiment. Everything downstream, the per-trade percentage, the daily limit, the maximum open exposure, is derived from the second number rather than chosen independently of it. Most plans do this in the wrong order: they pick 1% per trade because 1% is what people say, and never state the account-level figure that makes 1% either cautious or reckless.

The first number is a financial question with a factual answer. The second is partly financial and partly about you, and it is almost always lower than the figure people write down when nothing is at stake.

Working back from a 20% ceiling to a per-trade figure

Say the account is $5,000 and you decide that a 20% drawdown, $1,000, is the point at which you stop and review rather than keep going. That single decision constrains the per-trade risk completely, because risk sized as a percentage of the current balance compounds downwards. Here is how many consecutive losses each risk level buys you before the ceiling is breached, and how often a run that long turns up at a 45% win rate.

Risk per trade	Consecutive losses to breach 20%	Drawdown at that run	How often it appears at a 45% win rate
0.5%	45	20.2%	Effectively never
1%	23	20.6%	About every 2 million trades
2%	12	21.5%	About every 2,900 trades
5%	5	22.6%	About every 42 trades
10%	3	27.1%	About every 11 trades

Read the bottom two rows. At 5% per trade, the run that breaches your stated ceiling arrives roughly once every 42 trades, which at 20 trades a month is about every two months. At 10% it is a three-loss run, twice a month. The ceiling is not a safety net at those risk levels, it is a scheduled event. At 1% the same ceiling is reached by a run so rare it is not worth planning for, and the real threat becomes a grinding sequence of small losses rather than a streak. That is the calculation the risk of ruin calculator runs, and changing only the risk figure shows how sharply it turns.

So the order is: state the ceiling, then pick the per-trade percentage that makes the ceiling improbable rather than routine. A plan with a per-trade number and no ceiling has an unbounded loss, because nothing in the sizing rule tells you when to stop applying it.

The money that should never be in the account

Trading capital is money whose absence would not change your month. Not money earmarked for rent, a tax bill, tuition, a deposit or the emergency fund, and not borrowed money, because leveraged borrowing stacks two risks that can arrive together. The reason is behavioural rather than moral. Capital under time pressure produces a specific failure: the trader who needs a result by the end of the month takes a setup at double size on the 27th, because at normal size the arithmetic cannot deliver the number they need.

A useful test is to name the date you would need the money back. If there is one, the amount is not trading capital. If you cannot fund an emergency without touching the account, the account is your emergency fund wearing a different label, and its balance is going to be decided by your boiler rather than by your strategy.

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Your stated tolerance and your measured tolerance are different numbers

Ask someone how large a drawdown they could sit through and they will usually say 20% or 30%. Watch what they did at 8% and the answer is often different: the position size got cut mid-strategy, or doubled, the plan acquired two new filters in a week, or the account went quiet for a month. That behaviour is the real tolerance, and it is the number the plan has to be built around, because a ceiling you will breach in practice is not a ceiling.

Three ways to get closer to the measured figure. Look at how you actually behaved after your largest previous loss, in any asset, rather than how you remember it. Note whether you have ever checked a position outside your planned review times, which is an early tolerance signal. And treat demo results with suspicion: a 20% demo drawdown tests the strategy, not you. The drawdown calculator at least shows you the shape of the hole in advance, and the recovery arithmetic is unforgiving, since a 50% loss needs a 100% gain to get back.

The $500 account with a $200 monthly target

This is the most common way allocation goes wrong, and it is arithmetic rather than psychology. An account of $500 with a demanded $200 a month has to return 40% a month. At 1% risk per trade, that is $5 at stake per position, so the month needs 40 units of net risk earned. A strategy winning 45% of the time at 2 to 1 returns 0.35 units per trade on expectancy, so that is about 115 trades. Nobody takes 115 valid setups a month on one instrument.

So the risk gets raised instead. At 10% per trade the same target needs four units of net risk, which is two clean winners at 2 to 1 and sounds achievable, and it ignores what four consecutive losses do: 1 minus 0.9 to the fourth is a 34.4% drawdown, and the run arrives about once every 22 trades. The gap between the capital and the demand is not closed by sizing. It is closed by lowering the demand or raising the capital, and a survivable monthly figure compounded over several years is the only version of the arithmetic that holds together.

Undercapitalisation is not a reason not to start. It is a reason to start with the target unset, treating the first months as tuition rather than income. Most new traders lose money while they learn, and an allocation that assumes otherwise is the one that gets doubled down.

Writing the ceilings where they will actually bind

The broker will not enforce any of this. Margin close-out is a protection for the broker, and it fires far below any level you would want to discover. So the plan needs the numbers stated as hard stops with a defined consequence:

Per trade: a fixed percentage of the current balance, recalculated rather than estimated. See the position size calculator.
Per day: a loss figure at which the platform closes, typically two to three times the per-trade risk.
Per month: a level at which size is cut by half rather than stopped, so a bad month cannot become a catastrophic one.
Account ceiling: the drawdown at which you stop entirely and review, with a written answer to what "review" means so the decision is not invented while you are down.

Review the whole set once a quarter, and whenever your circumstances change, because tolerance is not a fixed property. It moves with income, with obligations and with how long you have been doing this. The risk management guide covers how the four ceilings interact once more than one position is open.

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Written and reviewed by the MarketPro research desk

MarketPro is a trading-signal and trading-education app operated by Harajuku Holdings LTD (Cyprus). Our signal desk publishes and tracks every trade idea in-app, and every page here is checked against the app's live behaviour before publishing. Last reviewed 15 September 2026. How we produce signals and content · About MarketPro

FAQ

Defining Your Risk Tolerance And Capital Allocation: questions

How much money should I start trading with?

Only capital whose absence would not change your month, meaning it is not earmarked for rent, tax, tuition, a deposit or the emergency fund, and it is not borrowed. A practical test is to name the date you would need it back: if there is one, it is not trading capital. The size matters less than the relationship, because a small account traded at a survivable percentage is a slower education, while a large account traded under pressure produces the oversized positions that end accounts.

What is a reasonable maximum drawdown to accept?

Most written plans set an account-level ceiling somewhere between 15% and 25%, at which trading stops and the plan is reviewed rather than adjusted on the spot. The figure matters less than deriving the per-trade risk from it. On a $5,000 account with a 20% ceiling, 1% per trade would need 23 consecutive losses to breach it, a run that effectively never happens. At 5% per trade it takes five losses, which turn up roughly every 42 trades at a 45% win rate.

How do I know my real risk tolerance rather than the one I claim?

Look at behaviour rather than at intentions. Your largest previous loss in any asset, and what you did in the week after it, is better evidence than an estimate made while flat. So is whether you have ever checked a position outside your planned review times. Demo results are weak evidence here, because a 20% demo drawdown tests the strategy and not you. Whatever level made you change sizing, add filters or stop trading is your measured tolerance, and the plan has to be built around that figure.

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