Yes, you can withdraw funds from your IBKR joint account to an individual bank account of either of the IBKR joint account owners and the withdrawal will not be considered a third-party withdrawal. However, depending on the joint account type, the account owner's authorization may be required.
Can I transfer funds from my IBKR joint account to my individual bank account?
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How can I open a Joint account?
Can I transfer funds or positions internally from an individual account to a joint account?
Can I transfer funds from my IBKR individual account to a joint bank account?
Can individuals below the age of 21 open a joint margin account?