I've been experimenting with stocks for the first time--opened up an Ameritrade account for the 500 free trades in the first month. I saw here and there that you can trade with unsettled funds if you activate Margin trading, so I did. I've got around $2,000 in my account--and made sure not to use any margin funds, just my own equity. But it looks like the "maintenance requirement" still applies if you trade with a margin account.. even if I'm NOT exceeding the actual account value, as I got a Regulation T call. I sold the stock I had (for a profit), and it resolved itself the next day. But doesn't this seem strange, if I only had $2,000 of stock in a Margin account with a Buying Power of significantly more? I held the stock overnight, but considering it was within my actual cash value.. shouldn't I be able to? I thought I'd read everything I needed to start--but apparently not. If any of you wizards could help me see the light, I'd appreciate it. Thanks!