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Quote from volatilitypimp:
DO NOT use IB for credit spreads(IC's) they will charge you margin for both sides of the IC. Thus, an 8% return for the month will be halved to 4%.(yeah, you get better commisions but terrible margins, and don't me started on their custome service)
I think OX, and I know TOS only charges one side of the IC, which is risk based because you can actually only lose on one end. Not too sure about TK.
That is completely incorrect. IB uses proper margining.
