Can I be in debt to you? Can my account go into a negative balance?

At FNmarkets, if a trader's floating profit and loss exceeds their account balance, resulting in a negative balance, their trades will not necessarily be closed immediately upon hitting a negative balance. Instead, FNmarkets will handle the situation according to their negative balance protection policy.
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The negative balance protection policy. ensures that the trader's account is protected, and trades may be automatically closed to prevent further losses, with the account balance being adjusted to zero as quickly as possible.