Trader Workstation provides an estimate of the commission fee for your trade, but may not be the exact charge due to exchange fees and/or regulatory fees that may not come through immediately. Your official commission charge is shown in your statement which is available in Client Portal. To access your statement, login to Client Portal and go to Performance & Reports followed by Statements.
Why is the commission different in Trader Workstation vs my statement?
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Summary of third party transaction fees
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