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Interactive Brokers Margin Accounts
Scenario 1 - When you sell the shares in a margin account, you will see your buying power go up, but your "amount available to withdraw" stays the same until settlement. Yes, you can reallocate the same day, no need to wait until settlement. There is no margin interest for this scenario.  Scenario 2 -  If that stock is marginable to 50%, and all you have is $10,000 in that stock, you can buy another $10,000. Once done, you are at 50% margin, exactly.