Quote from Proudrebel:
The beauty of IB is that you CAN change your price, re-transmit and have it fill all as one order. You can do this as many times as you like and it will always remain one order, with the savings in commission over 500 shares.
Actually Proudrebel...this is wrong. Jay123 is 100% correct I checked it out after reading this forum. You can change the price yes and have it turn around as a cancel and replace with ease ( a plus for IB). However, once that price is changed the commision reschedule resets back to .01 for the first 500 shares and .005 for anything remaing greater than 500 shares.
Example:
Place an order to buy 1500 shares of MSFT at 27 limit
According to the IB commision schedule if your FILLED all in at 27 without moving your price during anytime of this fill your commision charges would be as follows:
First 500 shares = $5
Next 1000 shares = $5
Total for 1500 shares = 10 bucks.
However if you change your limit price because the market is moving around..and usually the market is moving around from what I noticed in 10 years of trading all day long (little humor there) commisions MAY look like this instead:
Place same order to buy 1500 MSFT at 27
Filled on 500 shares at 27 = $5
(Then MSFT price moves up a bit so you decide to change order price upwards to 27.03)
You then get filled on the remaining shares at 27.03
Last 1000 shares = $7.5
Caluculated as follows. first 500 = $5 second 500 = $2.50
Now you all in price because you changed your limit price from the original order is a total of $12.50 on 1500 shares.
Of course if you changed your price 3 times the max price you would ever pay on 1500 shares would be $15 bucks if all shares got filled at .01 per share.
These are subtle difference that due add up over time..however who ever said trading was free.