If you are trading a stock that is quoted in a currency different from the currency of your account:
When executing an order, your account’s currency will be converted to the stock’s currency or the other way around, using the spot exchange rate + 0.15% FX fee. The precise amount will be listed on the Review Order page. FX Fee will not apply for payments arising from corporate events such as dividends.
See how the FX fee can apply to your investments in the following examples here.
Note: AutoInvest transactions in non-base currencies will also be subject to a 0.15% FX Fee.