Hi everyone, I've been a lurker for quite sometime, just registered now because I couldn't find this answer in the search anywhere. This might sound silly, but I've never had a margin account setup. I realize that with different brokers there are different policies, but generally speaking if I understand this correctly you can get a margin account for twice your equity (or more if it's a portfolio margin), and that there is a minimum percentage you must be invested in with a stock or be threatened with a margin call. I've been getting mixed signals on the following: If I have a 25k account, and I place an order for 10k, can I get the other 10k on margin eventhough I have 15k leftover equity? Or do I have to spend my own 20k money first, and only use the margin when my money has run short? ie. 20k on a stock, and 5k on another stock with 5k on margin? Also, I've read that some places allow a 4:1 margin account. Do you not need to initially invest with 50% of the stock? I'm just trying to figure out how to best optimize a margin account since it doesn't have the same T+3 regulations as equity accounts. Thanks!