Importantly, it is not possible to avoid paying tax by banking offshore.
As with standard savings accounts, interest earned on offshore accounts is paid without any tax deducted. While the Personal Savings Allowance means basic-rate taxpayers have no tax to pay on the first £1,000 of interest, and higher-rate taxpayers will have no tax to pay on the first £500, interest earned above these thresholds will still be taxable, whether it’s from an offshore account or not.
You must declare any savings interest earned to HM Revenue and Customs (HMRC) on a self-assessment tax form and pay tax on it in due course. If you don’t, HMRC are likely to come calling with a considerable fine.