If you trade mostly US instruments, you should specify USD as your base currency. Your commission should be same as for US traders, $0.75 per contract. So for the above scenario you should pay only $15 for the round-trip, a savings of $55. That could make all the difference for long-term profitabilityQuote from forex-forex:
That CSCO trade - 10 option contracts - was with BMO Investorline and total commission was $70.00 ($35.00 x 2). I have opened up an Interactive Brokers account and the fund transfer isn't complete yet, according to IB's fee schedule for Canadian accounts I would have paid $40.00 commission ($2.00 per contract, open and close) for a saving of $30.00.