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Understanding the T + 3 settlement days rule
The key word you forgot to include from Slide 29 is: Free-Riding Investopedia defines free-riding as: In the context of a brokerage firm, a free rider problem refers to a situation where a client has been allowed to purchase shares without actually paying for them, and then subsequently sells the shares (ideally for profit). The problem with this scenario is that the client, if allowed to free ride, can profit from a stock trade without actually using any of his or her own capital. This is illegal. I have not heard of any issues with this type of action being a problem with trading accounts in Australia, nor have I been able to find any such rules on the ASX website or any of by brokers websites. So I think this may be an issue in the USA but not Australia. You should check the rules in any other countries you wish to trade in.