Daily Drawdown Circuit Breaker

[NYC88]

A circuit breaker is a hard stop on behavior, not a motivational poster.

I've negotiated with myself past a breaker exactly enough times to know the sentence that ends accounts: "one winner to get back to flat." That sentence is banned on my desk. Should be banned on yours.

Define before the open

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MAX_DAILY_LOSS_R = 3R   # or fixed $
MAX_DAILY_LOSS_$ = ____
ACTION = FLATTEN + DISABLE HOTKEYS + WALK

Pick one primary meter. If you use both $ and R, the first one hit wins. No dual-key loopholes.

Implementation

1. Visible meter (sheet, platform plugin, or handwritten tick marks).
2. When hit: cancel all → flatten → physical step away 30+ minutes.
3. No "one winner to get back to flat."
4. Journal code: `DD_BREAKER_HIT`.
5. If the platform allows, disable buy/sell binds after breaker (leave flatten if needed).

Soft warning line

At 70% of max DD: size drops to micro automatically. Write it down so you don't negotiate. Negotiating is the failure mode.

Example day math

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Per-trade risk R = $50
Max daily = 3R = $150
Trade 1: -1R → remaining 2R
Trade 2: -1R → remaining 1R → size already micro by soft rule
Trade 3: -1R → BREAKER → done

If trade 3 "looked perfect," congratulations — you still stop. Doctrine is tested on perfect-looking trades.

Accounts die from unstructured days more often than from one bad idea. This is doctrine.

What's your max daily — R or $ — and is it written before the open?
Soft warning at 70%: do you actually cut to micro?
When you hit the breaker, do you walk or sit and "review" (aka stew)?
Anyone disabled hotkeys after breaker in platform settings — how?

[Fairman]

Circuit breaker as a hard stop on behavior: exactly. The banned sentence on my desk is the same one you named: "one winner to get back to flat."

For stock and ETF scalping I define before the open, in writing:

MAX_DAILY_LOSS_R (or a fixed dollar amount)
ACTION = FLATTEN + DISABLE HOTKEYS + WALK

I also pair it with a 2-loss walk-away at planned R even if the dollar breaker hasn't been hit yet. Two full losses is enough information for one session. The third trade is often cortisol wearing a strategy costume.

A worked example with round numbers. Say planned risk per trade is 1R = $50, and the daily breaker is 3R = $150. At 09:38 ET I take a planned long, 500 shares, 10 cents of risk. It stops out, plus a cent of slip, so about $55. At 09:52 I take a second A-setup, same size, stopped for roughly $50. I'm down about $105, under the dollar breaker, but I've hit two full losses. The rule says flat, hotkeys off, walk. Not "the dollar breaker still has $45 of room." That $45 is not a budget. It's the gap between a bad morning and a worse one.

Where people quietly break this on equities:

- They redefine R mid-day, so the second loss "was only half an R."
- They count a scratched trade as "not a real loss" when it was stopped at full size with slip.
- They switch tickers to reset the psychological counter.
- They move from the scalp account to another account "just to watch."

The meter doesn't care. Write the number where you can see it. Negotiating after you're already red is how breakers become posters.

If the platform allows, disable order hotkeys after the breaker trips. Relying on willpower alone at 10:15 after two losers is not a process. If it doesn't allow it, close the platform and leave the room for twenty minutes. Crude, but it works better than good intentions.

When the breaker should not be touched at all: news days where you already cut size, days after a big red session, any day you notice yourself mentally pre-negotiating the number before the open. That last one is the clearest signal to trade smaller or not at all.

Diagram: define → hit → flat → walk.