An Individual Savings Account (ISA) is one of the most powerful tax-sheltering tools available to UK residents. Put simply, any growth, interest, or dividends you earn inside an ISA wrapper is completely free from UK Income Tax and Capital Gains Tax.
The primary choices boil down to the Cash ISA (essentially a tax-free savings account with guaranteed returns) and the Stocks & Shares ISA (which invests in funds and equities for long-term growth). While Cash ISAs offer safety and clarity, Stocks & Shares ISAs are generally more suitable for horizons exceeding five years to outpace inflation.