Ask a trader on a $100,000 funded account how much they risk per trade and most will say one percent. It sounds disciplined. It is the same answer they would give on a personal brokerage account, and that is the problem.
On a personal account, one percent of $100,000 is $1,000 and the worst case is that you lose $100,000 slowly. On a proprietary trading account with an 8 percent maximum loss, the worst case arrives after eight losing trades. Not eight percent of the way to trouble. All the way.
The balance is not your risk budget. The distance between your equity and the floor is your risk budget, and on most evaluation accounts those two numbers differ by an order of magnitude.
Your Account Is Not Your Risk Budget
Run the arithmetic on a $100,000 account with an 8 percent static maximum loss and a 4 percent daily limit.
Your total loss allowance is $8,000. Your allowance for any single session is $4,000, which is half of everything you have, available to spend before dinner. At $1,000 per trade you are eight trades from termination and four trades from burning half your account in one afternoon.
Now size the same way against a 6 percent limit, which is the more common figure. The budget drops to $6,000 and the same one percent habit gives you six trades. A normal losing streak, the kind every strategy produces several times a year, is not a drawdown on a funded account. It is an exit.
Your real account size is the distance to the floor. On a $100,000 evaluation with an 8 percent limit, you are trading an $8,000 account that happens to control $100,000 of position size. The other $92,000 is margin. It sets your leverage. It does not absorb your losses.
The Three Numbers You Need Before You Size Anything
You cannot compute a risk unit from a percentage on a pricing page. You need three specific values, and two of them change.
The formula behind the floor. Static or trailing, and if trailing, whether it tracks closed balance or intraday equity. A floor that moves during the session you are sizing for makes your risk unit stale before you place the order.
The floor’s value right now. Under a static rule this is one number you write down once. Under a trailing rule it is a moving figure most platforms do not display, so you maintain it yourself or you are sizing against a guess.
The daily limit and its reset time. The daily limit binds before the maximum does, and it resets on the firm’s clock, not yours. A trader in New York working to a European server reset is closing positions at 6pm without realising the limit refreshed at the same moment.
This is where published parameters stop being a matter of principle and become a practical requirement. The method in this article is arithmetic, and arithmetic needs inputs.
If you are not certain which formula your account runs on, start with a walkthrough of how drawdown limits are actually calculated and then find your own three numbers. Where a firm states them plainly, a 6 percent static maximum and a 4 percent static daily limit being one published example, the risk unit can be computed before you place a single order. Where the calculation basis lives in a support ticket, it cannot, and no amount of discipline compensates for not knowing the number you are managing against.
Size Against the Floor
Convert the limit into trades, not percentages
Before anything else, divide your loss budget by your intended risk per trade. Eight thousand dollars at $400 per trade is twenty trades. At $1,000 it is eight. That integer is the only sizing metric that matters, because it tells you how many consecutive mistakes you are permitted, and every strategy has a losing streak longer than most traders assume.
What integer is enough? Work it out rather than picking one. A strategy winning 40 percent of the time will, across two hundred trades, throw a losing run of around ten purely from sequencing. That is arithmetic, not pessimism, and it is the streak your budget has to absorb without ending the evaluation. Twenty attempts leaves that run somewhere to happen. Eight does not.
Risk a fraction of the remaining buffer, not of the balance
Fixed percentage of balance barely moves as you lose, because the balance barely moves. Losing $4,000 on a $100,000 account changes your one percent risk from $1,000 to $960. Meanwhile your actual buffer has halved.
Size against the buffer instead. Risk five percent of the distance to the floor and the numbers adjust where it counts: $400 per trade at the start, $200 after you have given back half your allowance. The risk unit contracts exactly when survival matters, and you never mathematically reach the floor. That last property is not elegance. It is the difference between a bad month and a closed account.
Treat the daily limit as a separate budget
The maximum and the daily limit are different constraints and traders routinely plan for only one. Set a stop for the session at roughly half the daily limit and treat hitting it as the end of the day. On a $4,000 daily allowance, that is $2,000, and it means a bad session costs you a quarter of your total budget instead of half.
Regulators have moved the same way. FINRA’s intraday margin standards, effective June 2026, replaced the pattern day trader rules with continuous monitoring of equity against open positions, on the reasoning that what happens inside the session is what threatens the account.
Recalculate after every new equity high
Under a trailing rule the floor rises with your equity, which means a profitable week silently reduces your permitted risk. Traders who set a risk unit at the start of the evaluation and never revisit it are sizing against a number that expired.
Under a static rule the floor does not move, but the distance to it does. Either way the risk unit is a weekly calculation, not a setting.
The Point
Position sizing on a funded account is not the same discipline as position sizing on your own capital, and importing the habit is the most common reason competent traders fail evaluations they had the edge to pass.
A one percent rule is a statement about your balance. Your balance is not what you are risking. Work out the distance to the floor, divide it by the number of consecutive losses your strategy can produce, and size to that. The number will be smaller than you want it to be. That is the point.
Frequently Asked Questions
How much should I risk per trade on a funded account?
Rather than a fixed percentage of the balance, calculate it from your loss allowance. On a $100,000 account with an 8 percent maximum loss, the allowance is $8,000. Dividing by twenty gives $400 per trade, which lets a strategy survive a twenty-trade losing streak. The correct figure depends on how long your strategy’s realistic losing runs are, which is a question your own trade history answers better than any general rule.
Why is percentage of balance the wrong basis?
Because the balance is not the amount at risk. On a funded account the firm’s rules terminate you long before the balance is exhausted, so the meaningful quantity is the distance between current equity and the loss limit. A percentage of balance also fails to adapt: as you lose, the buffer shrinks much faster than the balance does, so a fixed percentage silently becomes more aggressive at the worst possible time.
Does the daily loss limit matter more than the maximum drawdown?
It usually binds first. A daily limit of 4 percent on a $100,000 account permits a $4,000 loss in one session, which is half of an 8 percent maximum. Two poor sessions can end an evaluation that the maximum drawdown alone would have survived. Plan a session stop well inside the daily limit and treat the maximum as the constraint you should never approach.