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Once you fulfill your obligation then you can keep your loan as long as you desire. If you want to sell the stock you own it will be taken as repayment of loan. The brokers will take the money you borrowed, only after that it goes for the next step i.e selling the stock. Traders must maintain the minimum account balance known to be as Maintenance Margin which is an another restriction opted for trader convenience or else the broker may force to invest money or sell stock or use it for repayment of loan. As traders borrow money it is a must to pay interest for the borrowed amount. In case of Margin Trading, the marginal securities are collateral. Unless traders decide to repay the loan the interest must be paid. As interest rate increases debt level also goes up.
Margin Trading is highly recommendable for short-term investor. But regarding other investors it is of high risk. If traders hold the investment for longer period then there is a good chance of high returns. Never forget that all stocks all stock are not qualified for Margin Trade. The Federal Reserve Bank are in charge of regulating what all the stocks can be brought on margin. According to thumb rules, broker never allow the stock listed below because of the day-to-day risk involved in it.
1 Penny Stocks
2 Over-the- counter Bulletin Board (OTCBB)
3 Initial Public Offering (IPO)