Your Available to trade balance represents the amount you have available to buy stocks or ETFs. It includes unused cash from your deposits as well as any proceeds from stocks or ETFs you've sold. 

Your Available to withdraw balance represents how much settled (and cleared) cash is in your account and can be withdrawn. 

Sometimes the amount you can withdraw will be different from the amount you have available to trade. There are two common reasons for this:

1. You've made recent trades that haven't settled yet. It takes trades two business days to settle, which means you need to wait two business days before you can withdraw the cash proceeds from selling a stock or ETF.
2. You've made a recent deposit that hasn't settled yet. All deposits take five business days to settle. You won't be able to withdraw a recent deposit until the end of this settlement period.