A complete guide to ISAs

Individual Savings Accounts, universally known as ISAs, began life as relatively simple savings plans in 1999, but over the past 25 years the rules surrounding them have become ever more complex – and may yet become more so.

While there have been calls to make the regime simpler and more accessible, until recently the government had shown relatively little interest in ISAs. Then in the Autumn 2023 Statement the then Chancellor simplified some of the administrative complexities but also removed one investment opportunity. Subsequently, in the March 2024 Budget, the Treasury launched a consultation on a new ‘UK ISA’ which, as its name suggests, would be focused on UK investment.

However, in the Autumn Budget 2024 Rachel Reeves, the new Chancellor, announced that she would not pursue the idea and, at the same time, froze ISA subscription limits at their current levels through to 2029/30. The government’s website says there are currently only four categories of ISA – cash ISAs, stocks and shares ISAs, innovative finance ISAs, and Lifetime ISAs – but variants exist for specific investment needs.

This guide will explain how the main variants work, in order of their original launch date.

*Please note that all examples included in this guide are fictitious.

The Main Categories of ISA

Despite the different choices available, all ISAs have several features in common. For example, they all enjoy tax privileges, a consequence of which is that the amounts that you can invest in each type, and in all ISAs, are generally subject to annual limits. ISAs may only be run by HM Revenue & Customs (HMRC) approved ISA managers.

The ISA family can be divided up in several ways – hence the differing headcount. One way of looking at it is to consider them in terms of when they first became available:

• Basic ISA – The original ISA lives on as a plan with two investment components: stocks and shares or cash. The two are interchangeable, so you can transfer from a stocks and shares ISA to a cash ISA, or vice versa.
• Junior ISA (JISA) – The JISA is available to children under 18 who do not already have a Child Trust Fund (CTF) account. Again, both cash and stocks and shares variants are available.

Make the most of ISAs – they are all free of UK Income Tax and Capital Gains Tax.

• Lifetime ISAs (LISA) – The LISA, launched in April 2017, is aimed at encouraging saving for first home purchase or for retirement. These ISAs can only be opened by adults under the age of 40. It provides investors with a government bonus but comes with penalties if funds are withdrawn before age 60, other than for a first home purchase. The choice of LISA providers is much smaller than for the Basic ISA. You will incur a LISA government withdrawal charge (currently 25%) if you transfer the funds to a different ISA or withdraw the funds before age 60 (other than for purchasing your first home) and you may therefore get back less than you paid into a lifetime ISA. By saving in a LISA instead of enrolling in, or contributing to an auto-enrolment pension scheme, occupational pension scheme, or personal pension scheme: (i) you may lose the benefit of contributions from your employer (if any) to that scheme; and (ii) your current and future entitlement to means tested benefits (if any) may be affected.
• Help to Buy ISA – This type of ISA is no longer available to new investors. In practice, it was a variant of a cash component basic ISA, aimed at first home buyers. The plan has been replaced by the Lifetime ISA (see above), but existing investors can continue making contributions until November 2029.