Passed the eval, blew the funded in week one: what changed
The most common story in this niche is not failing the eval. It is passing, getting funded, and breaching within days. The strategy did not change. Something else did.
The pattern repeats so reliably it deserves its own anatomy. Weeks of disciplined trading pass the eval. The funded account arrives, and within five sessions it is gone. Same strategy, same market, opposite outcome. Three things actually changed, and none of them is the edge.
Change one: the buffer reset, the size did not
Mechanically, the trailing buffer on a fresh funded account starts at its minimum while the trader's sizing habits are calibrated to the cushion they had built late in the eval. The first normal losing stretch lands on a floor that is suddenly close, the mechanics in the drawdown guide. The eval ended with room; the funded account begins without it.
Change two: the stakes flipped the psychology
The eval risks a fee. The funded account risks the thing already won, which activates loss-framing the eval never touched: revenge sizing after the first red day, moved stops to protect "my account", the override patterns priced in the cost of one override and the cycle in revenge trading. Paper-you passed the eval. Owner-you trades the funded account.
Change three: success licensed the loosening
Passing feels like proof, and proof feels like permission: a contract added here, a discretionary hold there. Oversizing on funded accounts is the single most common breach driver, the pattern in oversizing blows funded accounts, and it almost always begins the week after a win.
The fix is boring on purpose
Treat the funded account as the eval's identical twin: same size, same rules, sized to the fresh minimum buffer rather than the remembered cushion, the principle anchored in the passing guide. The systematic version simply removes the choice, hardcoded size and exits that do not know the account got promoted. The traders who keep funded accounts are the ones for whom passing changed nothing at all.
FAQ
Why do traders blow funded accounts right after passing?
Three compounding changes: the trailing buffer resets to its minimum while sizing habits stay calibrated to the eval's late cushion, the psychology flips from risking a fee to protecting a prize, and success licenses size and discretion creep.
Should I trade a funded account differently than the eval?
No. Same size, same rules, recalibrated only to the fresh minimum buffer. Accounts survive when passing changes nothing about execution.
Does going systematic actually prevent this?
It removes the levers the failure pulls: hardcoded size and exits cannot loosen after a win or tighten after a loss. The buffer math still has to be sized to the funded account's starting floor.
Not financial advice. Performance figures are hypothetical, modeled outputs (12-month sample; ~1,500-path Monte Carlo where noted). Past performance does not guarantee future results. Verify every prop-firm rule with the firm directly.