Prop Firm Daily Loss Limit: What Actually Uses It Up

A 5% daily limit on a $100,000 account looks like $5,000 of room. On most days it's less than that, and for some traders it's a lot less.

The difference gets spent before a single trade goes wrong, on costs that never show up as a losing trade.

A prop firm's daily loss limit is measured on equity, so floating losses, swap and commission count alongside closed trades. Part of it is always spent on costs rather than losses: overnight swap, commission, rollover spreads and slippage on the way out. How much depends on what you trade and whether you hold overnight, and it can be more than a fifth of the day.

What does the daily limit actually count?

Everything that moves your equity.

FundedNext states that its daily loss includes realized and unrealized P&L, swap and commission. FTMO defines its limit as a floor that your equity, open positions included, can't fall below. Different wording, same practical effect: a cost you never think of as a loss is a loss as far as the limit is concerned.

So the useful question isn't whether costs count. It's how much of the day they take, and that depends on two things most traders never check. Where the day starts from, and what they're holding when it does.

Where does your day start from?

Firms set the daily floor from one of two starting points, and it changes what happens to any position you carry through the reset.

From balance. The day's floor is set from your closed balance at the reset, ignoring open positions. FTMO's own trading objectives describe it this way: recalculated each day from the balance recorded at midnight Central European time. Summaries elsewhere describe FTMO's rule differently, so read the current page rather than trusting any secondhand version, this one included.

From equity. The floor is set from your equity at the reset, open positions included.

Take a $100,000 account with a 5% rule, holding a position through the reset, and run it both ways.

Neither is kinder. They're traps in opposite directions.

At a balance-start firm, a losing position held through the reset eats tomorrow's budget before tomorrow begins. At an equity-start firm, a winning position held through the reset raises the floor, so watching that profit evaporate counts as a loss for the new day even though you're still up overall.

Know which one your firm uses before you decide what to hold overnight.

What uses up the limit before you've lost a trade?

Four things, and none of them appears as a red line in your trade history.

Swap. Charged on every position held past the broker's daily rollover, and on one night of the week charged three times over to cover the weekend. Which night varies by broker and instrument. Open the symbol specification in MT5 (Ctrl+U, pick the symbol) and it's listed along with the long and short swap rates. On metals and indices, swap is often many times larger than on major currency pairs.

Commission. On raw-spread accounts it's charged per lot traded, and it scales with how often you trade rather than how well. Twenty lots across a day at a $7 round trip is $140 whether every trade won or every trade lost.

Rollover spread. For a few minutes around the broker's daily rollover, liquidity thins and spreads widen sharply, often several times over on metals. Your open positions are valued at the price you'd close them at, so a wider spread knocks your equity down instantly without a single trade happening. On an equity-measured limit, that dip counts in full.

Here's the part almost nobody notices. At most MT5 brokers, the daily rollover happens at server midnight. FundedNext resets its daily limit at server midnight. So the moment spreads are at their widest is the exact moment the new day's floor gets set.

Slippage on the way out. When a limit fires, yours or the firm's, positions close at market, usually into exactly the move that triggered it. The fill lands worse than the price that set off the close, and the difference comes out of the same budget.

How much does it add up to?

Two traders, same $100,000 account, same 5% rule. The figures below are examples, not quotes from any broker. Take your own from your symbol specification and account terms.

You won't pay every one of these on the same day. The buffer has to cover the day you do.

Now look at the advice every prop guide gives: on a 5% rule, set your own stop at 4%. For Trader A that's sound, with $710 to spare. For Trader B it's a breach. Their costs alone push them through the firm's floor before their own 4% stop ever fires.

The rule of thumb isn't wrong. It was written for Trader A.

Why does a tighter rule need a bigger cushion?

Because the costs are fixed in dollars and the limit isn't.

Put the same two traders on a 3% rule, which is $3,000 of daily limit on the same account. Trader A's costs take about a tenth of it, leaving $2,710, or 2.7%. Trader B's take 42%, leaving $1,730, or 1.7%.

The usual guidance of 2.3–2.5% on a 3% rule is comfortable for one of them and as much as three-quarters of a percent too loose for the other. On a tight rule, what you trade and when you hold it decides your number more than the rule itself does.

How to work out your own number

Once, properly, and then only again when the way you trade changes.

1. Start from the firm's limit in dollars, using the firm's own definition of where the day starts.

2. Look up your swap and the triple-swap night for everything you hold past rollover.

3. Work out your commission from how many lots you actually trade on a busy day, not an average one.

4. Watch the spread at rollover once on the symbols you hold overnight. You only need to see it widen once to know how far it goes.

5. Take slippage from your own history. How far past your intended exit did your worst fills land?

6. Subtract the worst plausible day. What's left is your trading room. Set your own limit inside it, and size positions from that figure, not from the firm's.

Setting it so it matches your firm

The arithmetic only helps if the limit enforcing it measures the same thing the firm does. In Vectorhelm, every variable in this article is a setting on the account-level daily loss limit.

It's measured on equity as your broker reports it, so floating P&L, swap and commission all count, the same way the firm counts them. You set your timezone and the day resets at midnight there, which lets you line it up with midnight Central European time for FTMO, your broker's server midnight for FundedNext, or whatever clock your firm uses, with daylight-saving shifts handled for you. The starting point is your choice, start-of-day balance or start-of-day equity, so the floor lands where the firm's does. And the limit can be a fixed amount or a percentage of that starting figure.

If you want something stricter on top, a separate realized-loss limit counts closed trades only, net of commission and swap.

Match the definitions once. Then set the number itself using the subtraction above, and let the account limit sit above every strategy you run.

The honest limitation

Matching the firm means inheriting its sensitivities.

A limit measured on equity sees the rollover spread spike exactly the way the firm's does. Set it close to the edge and it can fire on a two-minute widening that would have reversed on its own. That's the price of measuring the same thing the firm measures, and there's no version of equity-based protection that avoids it.

And no limit stops you at the exact figure. It fires, then positions close at whatever the market is offering in that moment. The gap between the trigger and the fill is the whole reason a buffer exists. A limit is a trigger, not a promise about your exit price.

Before your next session

Find out whether your firm starts the day from balance or from equity, and at what time.

Check the triple-swap night on anything you hold overnight.

Run the subtraction once, for the way you actually trade.

And if you hold metals or indices through the rollover, treat 4% on a 5% rule as too loose until your own numbers say otherwise.

We're building risk enforcement for funded accounts where the daily limit is defined the way your firm defines it, then set wherever your own arithmetic says. It isn't open yet. Early access is here if you want it when it is.

Vectorhelm is execution software. It runs the rules you define on accounts you own and control. Nothing here is trading advice, and no configuration of risk limits prevents losses. Figures in this article are illustrative; prop firm rules and broker costs change, so verify against your firm's and broker's own published terms.