From the IBKR Mobile Services menu, tap Banking and then Deposit Check to start your deposit. Enter the check amount, scan both sides of the endorsed check and, if necessary, identify which IBKR account is receiving the deposit.
All deposits require use of IB Key for two-factor authentication. Funds are generally available within six business days after the deposit is approved and you can track your deposit via the Deposit History screen. This feature is currently available to US clients and for checks drawn on a US bank.