First launched in 1999, Isas – more formally known as Individual Savings Accounts – have become a hugely popular way for savers and investors alike to shield their money from tax.
We explain everything you need to know: from the difference between a cash Isa and a stocks an shares Isa, to the benefits and the rules that you need to stick to.
Most of us are familiar with three types of Isa: cash, stocks and shares and junior Isas. But others are out there, including the Lifetime Isa. Here, you can find out how they all work.