EURUSD
Sergeant Major
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In theory, any good brokerage should give you a margin call before you go negative. Most margin call agreements are structure to leave at least a small positive balance. Of course, a big spike or a price gap over a weekend could wreck your account and leave you negative if you were getting close to a margin call.
If you were trading correctly, you should never use so much of your available margin that there's any chance of a margin call. Proper risk management involves not only limiting the total percentage of your account risked per trade, but also the total risked at any one time.
I think you're right. It is impossible to trade in negative balance because your account will face Margin Call before it is negative. But some brokers gave bonus deposit which can hold position more than your account. Example : there is 30% deposit bonus so if you deposited $100 then you got $130 in your account but the bonus could be used to hold floating condition only and it is unable to be withdrawn.