We’ve all been there: a bank account opened for a specific goal a decade ago, or a stocks and shares portfolio started on a whim…and then buried under a mountain of life’s more urgent admin.
While these accounts might be “out of sight, out of mind”, they shouldn’t be out of pocket.
In a financial landscape that has shifted dramatically by 2026, leaving your money in an outdated “zombie ISA” isn’t just a minor oversight, it’s a choice that could be costing you thousands in lost interest and unnecessary fees.
What is a zombie ISA?
Zombie ISAs may sound a bit alarming, but they’re not quite as dramatic as the name suggests. They’re simply a savings or investment account opened a while ago and forgotten about.
The savings rate might have matured, so your money isn’t working as hard as it should be. Or that old stocks and shares ISA might have a much higher admin fee than more modern competitors.
It’s more common than you’d think. Life gets busy, and financial admin can slide down the to-do list.
But leaving an ISA to gather dust could mean you’re missing out on significantly better returns or paying far more in fees than you need to.
The scary bit
Over time, a zombie ISA can have a meaningful impact on your financial position. It’s essentially compounding in the wrong direction; money sitting in a matured cash ISA earning 1 per cent or less, when rates of around 4 per cent and above are available elsewhere, could be costing you hundreds of pounds a year on a modest balance.
Across five or ten years, that lost earnings gap grows into something significant.
The same logic applies to investments. Platform fees that once seemed reasonable may now look steep compared to newer, leaner alternatives and high costs are one of the most reliable drags on long-term investment returns. A difference of even 0.5 per cent in annual charges can add up.
The good news is that the ISA market has never been more competitive. Providers are actively working to win new customers, which means you have real leverage as a saver or investor. The tools to compare your options are freely available, and the switching process itself is designed to be painless.
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There have been a raft of fee cuts this year, and there are a few providers that offer accounts with no fees whatsoever. For example, the average cost of buying or selling a UK share online used to be around £7.50. These days that average cost has fallen to £4.95. And some places let you trade UK shares for free.
If you’ve got an account gathering dust, it’s worth investigating and considering a move. Your first port of call might be doing some research to find out the best rates out there. There are lots of competitive rates for your cash, the best of which are hovering above the 4.5 per cent rate.
Average stocks and shares ISA fees are also falling. The average admin fee for a £20,000 ISA invested in investment funds is 0.31 per cent, down from 0.36 per cent five years ago. A number of new names now offer fee-free ISAs as well. The total cost will vary, but as a general rule of thumb, you shouldn’t be paying more than 1 per cent all-in (for both administration and investments). Boring Money reviews and compares over 40 leading providers so you can decide which works best for you.
Switching – surprisingly simple
Zombie ISAs exist largely because people assume switching is complicated, involving a lot of phone calls and paperwork, and want to avoid the faff.
In reality, it’s considerably more straightforward than most would expect. The process itself is mostly handled by your new provider – you will just need to give a few details, like your existing plan number.
But there is one critical rule to be aware of before you do anything: never move the money yourself.
Don’t sell your investments and transfer the cash, because once it leaves your ISA wrapper, you’ll lose its tax-free status permanently. Instead, let your new ISA provider do the hard work for you. They’ll move the whole lot without your money ever leaving the tax-free wrapper and crucially, you get to keep your annual £20,000 ISA allowance intact too.
How to de-zombify your ISA
Start with an audit of your accounts. Locate any ISAs you have open, particularly any ones you haven’t looked at in years. Check the current rate or performance and compare it with what’s available right now.
If you decide to move, the process is typically straightforward: choose your new provider, complete their transfer request form, and let them handle everything else.
Most ISA transfers are completed within 15 working days, and a good provider will keep you informed of how it’s getting on throughout the process. Service levels do vary so check out customer reviews of any providers.
So, if you have an ISA you haven’t thought about in a while, now is a good time to take a look. It doesn’t need to become a big project: a quick check of what you’re earning or paying, a comparison against what’s out there, and, if it makes sense, a simple transfer request is all it takes.
When investing, your capital is at risk and you may get back less than invested. Past performance doesn’t guarantee future results.