A regulatory protection that prevents a retail client account from going below zero after a large adverse move.
Negative balance protection (NBP) ensures that if a trader's losses exceed their account balance - typically caused by a market gap that moves through the stop-loss level before the broker can close the position - the broker absorbs the deficit rather than pursuing the client for the shortfall. Without NBP, a trader could theoretically owe the broker more than their entire deposit, an outcome that became headline news after the Swiss National Bank removed the EUR/CHF floor in January 2015, causing millions of dollars in losses beyond client account balances at several unprotected brokers.
NBP is now mandatory for retail clients under FCA (UK), ESMA (EU), ASIC (Australia), and most other Tier-1 regulatory frameworks. A broker authorised under these regimes cannot hold a retail client liable for a negative balance arising from normal market activity - including flash crashes, gap openings, or extreme volatility events. It is one of the most meaningful practical protections retail traders receive, and its absence is a significant red flag when evaluating an offshore or lightly regulated broker.
It is important to understand what NBP does not cover: it resets the account to zero after an extreme event, but the client still loses their entire deposit. It also does not eliminate the risk of holding highly leveraged positions through known risk events - it is a backstop of last resort, not a risk management strategy. Traders should still use stop-losses, size positions appropriately, and consider reducing exposure ahead of scheduled high-impact releases like central bank decisions or political votes.