Trailing vs Static Drawdown: Why Your Floor Moves When You Win
"10% max drawdown" sounds like one rule. It's at least two, and which one you've signed up for changes how much room you have after a good week.
Static: the floor never moves
On a static max drawdown, the floor is set from the starting balance and stays there.
$100,000 account, 10% static: the floor is $90,000. Make $6,000 and the floor is still $90,000. You now have $16,000 of room, not $10,000.
Winning buys you space. That's the friendly version.
Trailing: the floor follows your high
On a trailing drawdown, the floor sits a fixed distance below your highest point and moves up as that high moves up. It never moves down.
Same $100,000, 10% trailing. Make $6,000 and your high is $106,000. The floor is now $96,000. You still have $10,000 of room, exactly what you started with.
Lose $4,000 from there and you're at $102,000, up on the account, with only $6,000 left before you fail. People get disqualified while in profit this way and are genuinely surprised by it.
Balance or equity, again
Trailing has the same trap as daily drawdown: what counts as the "high".
- Balance-based: the high only moves when you close a trade. Floating profit doesn't count.
- Equity-based: the high moves with open profit. A trade that runs up $3,000 and comes back to breakeven has dragged your floor up $3,000 and given you nothing for it.
Equity-based trailing punishes letting winners breathe. If your strategy holds trades through big swings, that's worth knowing before you pay for the challenge.
Where the trailing stops
Many firms stop trailing once the floor reaches the starting balance. On the $100,000 example, once your high hits $110,000 the floor locks at $100,000 and stays there.
After that point, trailing and static behave the same. Before it, every new high costs you room. Check the rules for the exact lock point. Some firms use the starting balance, some use the balance plus a buffer, some don't lock at all.
What changes in practice
With static drawdown, it's reasonable to size a little bigger once you're well in profit, because the room is actually there.
With trailing drawdown, the room doesn't grow until the lock. Treat it as a fixed buffer:
- Work out the room from your current high, not the starting balance.
- Size each trade as a slice of that room, not of the account.
- Taking partial profit early does more than it looks like on equity-based trailing. It stops an open winner from pulling the floor up and then giving everything back.
The prop firm sizing guide covers the lot-size side. The calculator takes whatever risk amount you decide is left.
The rule says 10%. What it means depends on one word in the contract. Find it before you trade, not after.