Hello Thintwit1954!
Everything depends on promotion's Terms & Conditions, but usually there are two types of Forex Deposit Bonuses that you can withdraw or that are only for trading purposes. If you need trade certain numbers of lots, bonus is most likely withdrawable from account.
Note that sometimes if you lose your deposit, bonus will be automatically removed i.e. you deposit $1000 + bonus $1000 = balance $2000, you trade and your balance drop to $1000 and then your bonus will be removed so your balance will be $0.
Please read promotion's terms, every promotion is different.
