Suppose a IBKR client margin account is entirely in USD. He wants to buy Nikkei futures in JPY. Would it be better for him to convert to some JPY in cash to maintain the necessary margin for the Nikkei futures or remain entirely in USD? What happens if he chooses to remain in USD? Will it result in negative JPY balance and he needs to pay interest for it?
I like IBKR universal account for its convenience but its flexibility raises more questions sometimes. Can IB representatives on this…