Margin Tutorial: (In case anyone's interested)
You begin the day all cash. Your Acctinfo screen looks like this:
Beginning Excess Equity 10,000 10,000 Less: Reg T Requirement - - Less: MMR - - __________________ ______________ = 50% Intraday = 50% Overnight Buying Power Buying Power
Intraday Credit 0
Total Buying Power = 20,000 20,000 (This last line isn't displayed. You'll have to figure it out yourself.) -------------------------------------------------------------
You buy $20,000 of xyz and hold overnight. Next day your screen looks like this (assuming no price change in the stock and not taking into account commissions):
Beginning Excess Equity 5,000 5,000 Less: Reg T Requirement - - Less: MMR - - 5,000 __________________ ______________ = 50% Intraday = 50% Overnight Buying Power Buying Power
Intraday Credit 0
Total Buying Power = 10,000 0 ------------------------------------------------------------ You are margined to the limit for overnights but can still daytrade up to $10,000. You do this until the end of the day. At one point you have bought $10,000 of abc as a daytrade. You still own the overnight xyz. Your screen looks like this:
Beginning Excess Equity 5,000 5,000 Less: Reg T Requirement - - 5,000 Less: MMR - 5,000 - 5,000 __________________ ______________ = 50% Intraday = 50% Overnight Buying Power Buying Power
Intraday Credit 0
Total Buying Power = 0 -10,000 ------------------------------------------------------------- If you don't close out your daytrade, you'll have to fork up 10 grand the next day to cover the Reg T margin call.
You want to keep abc. You decide to dump your $20,000 of xyz instead. You sell all of your xyz at the price you bought it. Now your Acctinfo screen looks like:
Beginning Excess Equity 5,000 5,000 Less: Reg T Requirement - - 5,000 Less: MMR - 5,000 - 5,000 __________________ ______________ = 50% Intraday = 50% Overnight Buying Power Buying Power
Intraday Credit 5,000
Total Buying Power = 10,000 5,000 --------------------------------------------------------------
The last line is calculated by multiplying your intraday credit by 2 and adding it to both columns. You can switch a fully margined position to another fully margined position in a different stock from one day to the next and day trade using the credit all day long as long as the new overnight position is in a different stock. If you buy the same stock at the end of the day to hold overnight the SEC considers that to be the same as never selling it in the first place. That's fine as long as you don't use the intraday credit to daytrade. If you do use it, the SEC forces a margin call for the amount of credit you used.
Note also that the combined margin (overnight and daytrading) is 200% of your equity (your original $10,000 used to buy $20,000 worth of stock plus $10,000 for daytrading).
The next morning, your screen looks the same as the first morning with xyz:
Beginning Excess Equity 5,000 5,000 Less: Reg T Requirement - - Less: MMR - - 5,000 __________________ ______________ = 50% Intraday = 50% Overnight Buying Power Buying Power
Intraday Credit 0
Total Buying Power = 10,000 0 ------------------------------------------------------------
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