Tax Paid on the purchase and disposal of U.S Shares using USD

Hello, I currently invest in U.S companies using a UK broker using USD as the currency. What taxes would I have to pay HMRC? Furthermore, how would the taxes work using a foreign currency (USD) relative to the GBP (Great British Pound)? Thank you

Hi,
It depends on what type of income is received. You can see guidance here:
Tax on foreign income
Thank you.