Originally posted by LA ECHO
The settlement of all those transactions is going to happen at the same time. So your broker may choose to allow you to do that based on the fact that they know and can monitor what your balance(equity) will be at settlement. If they did that they are essentially doing you a favor. If the net result of 10 day trades is an increase in equity of $200 then even if it took an aggregate of $1M ($1M in proceeds, $999,800 in purchases), your firm does not have to technically transfer any money out untill T+3, at which time it gets the same amount +$200 transferred in. So because all trades clear at the same time, there is no money loaned.