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Comment on Ask HN: How are account balances updated in a real bank?

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I remember one bank used to, and it was big news, process all deductions from accounts, then issue overdrawn penalties, then any deposits. So if you had $500 in your account, then deposited $500 in cash, then withdrew $501, you would be overdrawn and assessed a penalty. Oh and it was a very major bank (in the US).

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