Rules on ISA's
People are only allowed to contribute to one ISA of each type in a financial year. This means they can put money into a Cash ISA and a Stocks and Shares (otherwise known as investment) ISA each year, but not into two different cash ISAs or two different investment ISAs. The only exception is with some of the newer type of Help to Buy ISAs or Lifetime ISAs. This means that individuals can save money into a lifetime ISA, a Stocks and Shares ISA and a Cash ISA in one year.