That's the correct form for receiving bank interest free of tax, read your question again and you state "Investments " that COULD mean somethng different, dividends will be taxed at 20 per cent at source before receipt, interest on bonds wll also be taxed at the applicable rate, that's if you are a resident of the UK. Its a mine field out their with many different tax rates on different investments best to talk to who are holding the investments in question.