Unfortunately closed accounts cannot be removed from Client Portal. Closed accounts are made available for you to retrieve statements and other account information after account closure.
How do I remove a closed account from view in Client Portal?
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How can I get cost basis and tax documents after closing my account?
Do you charge a fee to close an IBKR account?
How do I download my paper account Activity Statements?
How can I submit my statement at the end of the fifth year?