Hello I have a question concerning base currency on IB. I've searched existing threads and not found quite what I'm looking for. I've just opened an account on IB and need to choose my base currency. I live in Switzerland, originally from the UK. The money I will invest is currently in three currencies: GBP (75%), CHF (20%) and USD (5%). I plan to invest mostly in US ETFs / stock (70%) with the rest in Swiss or UK ETFs. I'm not sure if I should a) choose USD as my base currency because that is where I will mostly invest, b) choose GBP because that is the currency where most of the money I will invest is in or c) choose CHF because I live in Switzerland and am a resident for tax purposes. An advice would be welcome! Thank you.