Quote from JackR:
You don't indicate what type of balance you are carrying. Let's assume it is $600,000 ($600K). You need at least $500K to get the 6% rate at just2trade(J2T).
In looking at the J2T web site I see that they have 5 tiers to reach their lowest margin rate of 6%.
I did a quick calculation of the simple interest rate on $600K using their five tiers and IB's two tiers.
J2T = 6.81...%
IB = 6.48...%
The rates begin to converge as you approach $1M. After that IB pulls away as their over $1M rate of 5.899% kicks in.
You might give it a try with your real average balance.
Jack