In general, the balance of a Forex trading account cannot be negative. The balance represents the total amount of money in your account, including your deposits, profits, and losses. It is the net amount of funds you have available for trading.

If your account balance reaches zero or becomes negative, it usually means that your account has experienced significant losses that have exceeded your initial deposit or available funds. In such cases, your account may be subject to a margin call or automatic stop-out by your broker. This means that your open positions may be closed automatically to prevent further losses and to protect both you and the broker from incurring substantial debts.

However, it's important to note that some brokers may offer negative balance protection, especially for retail traders. Negative balance protection ensures that you cannot lose more than the funds you have deposited into your trading account. In situations of extreme market volatility or significant price gaps, where losses exceed your account balance, the broker would typically absorb the negative balance, protecting you from owing the broker additional funds.

It's crucial to review the terms and conditions of your chosen broker to understand their specific policies regarding negative balance protection and margin calls. Additionally, managing risk effectively, using appropriate position sizing, and implementing risk management tools like stop-loss orders can help mitigate the risk of significant losses and potential negative balances in your Forex trading account.