Whether or not an instruction is required is a function of both the transaction type (i.e., deposit or withdrawal) and its underlying method (i.,e. check, ACH initiated at IBKR or wire).  In general, if the deposit method dictates that IBKR pull funds directly from the client’s account or if the withdrawal method dictates that IBKR push funds directly to the client’s account, an instruction will be required in order to obtain the necessary account specific information and authorization to act.  Outlined in the chart below are the possible scenarios.