Introduction to ISA's

The ISA is one of the most generous tax breaks in the UK system, and one of the most under-used. Every UK adult gets a £20,000 allowance each tax year, free of income tax and capital gains tax for life. Yet the allowance cannot be carried forward — anything unused on 5 April disappears permanently. A couple who use both allowances consistently shelter £40,000 a year from tax; over a working lifetime, that compounds into a tax-free pool that pensions cannot replicate for accessibility.

This guide is a plain-English walk-through of how the ISA actually works in practice. It covers the four types — Cash, Stocks and Shares, Lifetime, and Junior — and explains when each makes sense; the rules around transfers, flexible withdrawals and the £4,000 LISA sub-limit; how Bed-and-ISA can move existing investments into the wrapper; how ISAs are treated on death (more generously than most people realise); and the five small mistakes that quietly cost ISA holders thousands over a working lifetime.

It is written for people who want to make confident decisions about their own money, not be sold a product. It also includes a worked example — Gemma, a freelance TV editor with variable income — showing how the choices play out for a real person, and a glossary at the back so no term is left undefined.