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How can I buy and sell the same stock on the same day?
You should not have to wait 3 days to sell the stock after purchase. If you are trading with a cash account you will have to wait for the sale to settle (3 business days) before you can use those funds to purchase other stock. If you meet the definition of a pattern day trader which is 4 or more day trades in 5 business days then your brokerage will require you to have a minimum of $25,000 in funds and a margin account.