Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Can my broker lock my cash account if I try to use the money from a stock sale during the three-day settlement period?
Here's how this works in the United States. There's no law regarding your behavior in this matter and you haven't broken any laws. But your broker-dealer has a law that they must follow. It's documented here: The issue is if you buy stock before your sell has settled (before you've received cash) then you're creating money where before none existed (even though it is just for a day or two). The government fears that this excess will cause undue speculation in the security markets. The SEC calls this practice freeriding, because you're spending money you have not yet received. In summary: your broker is not allowed to loan money to an account than is not set-up for loans; it must be a margin account. People with margin account are able to day-trade because they have the ability to use margin (borrow money). Margin Accounts are subject to Pattern Daytrading Rules. The Rules are set forth by FINRA (The Financial Industry Reporting Authority) and are here: