An Individual Savings Account (ISA) is a tax-efficient way to save or invest. UK residents aged 16 and over can choose to save in a cash ISA or if they are 18 or over, a stocks and shares ISA or a combination of both. Parents or guardians could also open a Junior ISA for children under 18.
The interest on a cash ISA isn't taxed so all the interest you earn you keep. With a Stocks & Shares ISA, all gains are free from capital gains tax, you don't even need to declare your ISA investments to the tax man.
The beauty of ISAs is that they don’t end when the tax year does. You take it with you into the new tax year meaning each year you get the tax benefits on the cumulative amount. You can keep adding to your ISA and the sooner you do this in the new tax year the more you maximise the tax benefits ISAs give you.
You can only invest with one cash ISA provider in each tax year. You can also have a Stocks & Shares ISA with the same, or a different provider.