It’s not something most people sit around thinking about, but if you’ve got money tucked away in an ISA, it’s worth knowing what actually happens to it when you’re no longer around.
ISAs are popular in the UK because they let you earn interest or grow investments without paying tax, but that protection doesn’t just carry on untouched after death. The rules change, and if you don’t understand them, it’s easy to assume things work more simply than they actually do. What happens next depends on your situation, especially whether you have a spouse or civil partner, how your estate is set up, and how quickly everything gets sorted.
Your ISA becomes part of your estate when you die.
When you pass away, your ISA doesn’t sit off to one side with its own special rules anymore. Per the GOV.UK website, it becomes part of your estate, which means it’s grouped together with everything else you own, including savings, property, and personal belongings. From that point on, it’s handled in the same legal process as the rest of your assets.
Your executor or administrator takes over responsibility for it, and their job is to work through your finances, settle any debts, and then distribute what’s left to the right people. The ISA is treated as part of that overall pot, rather than something separate.
The ISA keeps its tax-free status for a limited time.
One thing many people don’t realise is that the tax-free benefits don’t stop the moment you die. Your ISA becomes what’s known as a continuing account of a deceased investor, which means it can still earn interest or investment growth without tax being applied for a period of time.
That period isn’t open-ended, though. It lasts until the earliest of three things happening, which are the account being closed, the estate being fully dealt with, or three years passing from the date of death. After that, the rules change.
After that, the ISA wrapper effectively disappears.
Once that time window ends, the ISA loses its special tax-free status. The money itself doesn’t vanish, and it can still be passed on to whoever inherits it, but it’s no longer protected in the same way going forward. That means any future interest or investment growth could be taxed like a normal account, which is why the timing of when the estate is settled can have a real impact on the overall value.
A spouse or civil partner gets an extra ISA allowance.
If you’re married or in a civil partnership, the rules become a bit more favourable. Your partner doesn’t simply take over your ISA as it is, but they are given something called an Additional Permitted Subscription, often shortened to APS. This allows them to put an amount equal to your ISA savings into their own ISA, which helps preserve the tax-free benefits you built up as a couple rather than losing them completely.
This allowance sits on top of their normal yearly limit.
The APS doesn’t replace the standard ISA allowance your partner gets each year. It sits alongside it, which means they can still use their full annual allowance as normal. In practical terms, that gives them much more flexibility. They can continue saving as usual while also moving across the value of your ISA into a tax-free environment again.
The amount isn’t always as simple as it sounds.
In most cases, the APS is based on the value of your ISA at the time of your death, which makes it easy to understand on the surface. However, the actual rules are a bit more flexible than that. Depending on how the account is handled, your partner may be able to use a value based on when the ISA is closed instead, and in some cases the higher of the two values can apply. That can make a noticeable difference if the investments have grown.
They don’t have to inherit the ISA to use it.
This is one of the details people often miss. Your spouse or civil partner can still use the APS, even if they aren’t the person who actually inherits the ISA itself. As long as they were legally your partner at the time of death, they’re entitled to that allowance, which means the benefit is tied to the relationship rather than who receives the money.
Unmarried partners don’t get the same treatment.
If you’re not married or in a civil partnership, the situation is different. Even if you’ve been together for years, your partner won’t qualify for the Additional Permitted Subscription. They can still inherit your ISA if you’ve left it to them, but they won’t get that extra allowance, which means the tax-free advantage can’t be rebuilt in the same way.
Inheritance tax still applies in most cases.
ISAs are often described as tax-free, but that only applies while you’re alive. When you die, the value of your ISA is usually included as part of your estate for inheritance tax purposes. If your estate is large enough to exceed the threshold, some of that value could be taxed, unless it’s passed to a spouse or qualifies for specific reliefs under the rules.
Some ISAs can reduce inheritance tax, but they’re not typical.
There are certain types of ISA investments, particularly those involving AIM-listed shares, that can qualify for Business Relief and reduce inheritance tax after a set period. However, these come with higher risks and aren’t what most people hold in their ISA, so they tend to apply in more specialised situations rather than everyday savings.
The ISA will eventually be closed during the process.
At some stage, the ISA itself will be closed as part of the estate administration. The money or investments inside it will then be transferred to the people inheriting it or moved into standard accounts. How quickly that happens depends on how complex the estate is, but it’s not something that remains open indefinitely.
Not all providers handle things in exactly the same way.
While the rules around ISAs are set nationally, the way providers deal with accounts after death can vary slightly. Some are quicker than others, and not all offer APS subscriptions. This means your partner might need to choose a provider that supports APS if they want to make full use of the allowance available to them.
A will makes a big difference to how smoothly this goes.
If you’ve clearly set out who should receive your ISA and other assets, it makes the process far more straightforward for the people handling your estate. Without a will, everything is decided by legal rules, which can slow things down and lead to outcomes that don’t necessarily reflect what you would have wanted.
A bit of planning now can protect more later.
Understanding how ISAs are treated after death gives you the chance to make better decisions while you’re still in control of things. Even simple steps like writing a will, reviewing your accounts, and making sure your partner knows how the rules work can help preserve more of your savings in the long run.
How to get a handle on your assets while you still can
There are some brilliant resources that can take the mystery out of the whole process of estate planning. Citizens Advice is a fantastic first port of call for a clear, jargon-free breakdown of how inheritance works and what your legal obligations are. For the nitty-gritty of your will, the Law Society has a solid find-a-solicitor tool that’ll connect you with someone local who knows their stuff.
If you’re particularly worried about how your ISAs and pensions fit into the tax man’s plans, the MoneyHelper service, backed by the government, offers free, impartial guidance on inheritance tax and estate planning. It’s also worth checking out Age UK, as they’ve got some really practical, down-to-earth guides on everything from power of attorney to making sure your digital life, like your social media and cloud photos, is handled properly too.
