I am not a financial advisor and nothing in this post constitutes financial advice. All investments carry risk and the value of your investments can go down as well as up. Please do your own research and consider seeking independent financial advice before making any investment decisions.
You’ve put money into a stocks and shares ISA. It’s invested, which means it isn’t sitting in a savings account with a reassuring bit of interest coming in from time to time. And somewhere along the way, a quieter question turned up: is this actually safe?
It’s a fair question, and it deserves a proper answer rather than a wave of the hand. Because the word “safe” is doing two very different jobs here. It can mean: will my money still be there if the platform holding it goes under? Or it can mean: will what I’ve invested hold its value, or even grow? Those are two separate risks, with two entirely different protections, and mixing them up is exactly what makes this topic so confusing.
So, are stocks and shares ISAs safe? For the first risk, the platform failing, you have real protection, up to a limit. For the second, your investments losing value, you have none at all. That isn’t a flaw. It’s the price of investing rather than saving.
I’ve touched on this in passing across several of my posts, in my platform reviews and in my comparison of cash and stocks and shares ISAs, but never properly, in one place. This is that place. I’m Angelina, I’ve held five accounts on Interactive Investor for seven years, and I’m going to take you through what FSCS protection covers, what it doesn’t, how your investments are actually held, and where the platforms I’ve reviewed stand. Let’s get into it.
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The short answer: are stocks and shares ISAs safe?
Yes, in the way that matters most. If your platform or provider fails, the Financial Services Compensation Scheme (FSCS) can protect your eligible investments up to £85,000 per person, per authorised firm.
But FSCS does not protect you against your investments falling in value. That’s a separate risk, and it comes with investing itself.
Both halves matter. The first is why you can stop worrying about the platform. The second is why you should only invest money you can leave alone for five years or more. Every figure in this post is correct at the time of writing (September 2026), so do check the FSCS website before relying on any of them for a big decision.
What FSCS protection covers on a stocks and shares ISA
FSCS is the UK’s compensation scheme for customers of authorised financial firms. If one of those firms goes out of business and something has gone wrong, the scheme can step in. In it’s own words, it may be able to protect you if a provider goes out of business and there’s a shortfall in the money or assets it’s holding for you.
For investments, the limit is £85,000 per eligible person, per authorised firm. Three parts of that sentence are worth slowing down for.
Per person. The limit belongs to you as an individual.
Per firm. It’s the platform that counts, not the individual account. Because FSCS words the limit per firm, your ISA, SIPP, standard Trading Account and any other investment account held with the same investment platform are not assessed separately, they all sit under one £85,000, not one each. Here’s my own position as a real example. My five accounts at Interactive Investor come to around £77,000 combined. Even on that cautious basis I’m inside the limit, but not by a huge margin, and that’s a number worth knowing.
Authorised firm. Protection only works if the firm is authorised by the Financial Conduct Authority (FCA) or the Prudential Regulation Authority. FSCS itself tells you to check your provider is authorised first, and I’ll show you exactly how further down.
Here’s a quick illustration of where the limit bites. It’s a worked example, not a prediction.
Say you had £100,000 with one platform, it failed, and the full £100,000 was somehow missing. FSCS could compensate you up to £85,000, which would leave £15,000 outside its protection.
The chances of ever reaching that point are small, for reasons I’ll explain in the ring fencing section, but it’s the honest edge of the protection, and it matters most if you’re a larger investor with everything in one place.
What about cash ISAs? These sit under different rules. FSCS treats a cash ISA as a deposit, and on 1 December 2025 the deposit protection limit rose to £120,000 per person, per firm. That’s the figure I compared against the investment limit in my cash ISA vs stocks and shares ISA guide. Two types of ISA, two different limits, which is exactly why people so often quote the wrong one.
Are ISAs protected by FSCS when the market falls? (what it doesn’t cover)
No. This is the part I’d ask you to read twice.
FSCS is explicit that it can’t accept claims for poor investment performance, because “the nature of investments means their value can go down as well as up.” It also warns that some investment products aren’t protected at all, so it’s worth checking any specific product you hold rather than assuming.
Here’s what the difference looks like with numbers. Again, this is a worked example rather than a forecast.
Say you have £40,000 in a stocks and shares ISA, held in a global index fund, and a rough year knocks 25% off it. Your £40,000 becomes £30,000, a loss on paper of £10,000. FSCS pays nothing towards that, because your platform is perfectly healthy and nothing has failed.
Now flip it. Your investments haven’t fallen at all, but the platform holding them fails and £40,000 of assets can’t be accounted for. That is exactly what FSCS exists for, and because you’re under £85,000, you’d be looking at protection in full.
Let those two scenarios sit side by side for a second. In the first, your money is entirely safe with the platform and you’ve lost £10,000 on paper. In the second, your investments never moved and the trouble was the platform.
Same word, two completely different risks.
I know the first one from experience, not just theory. During the Covid lockdown I watched the value of my own investments drop further and faster than I’d ever seen. That was a proper squeaky bum moment. I left it invested, and over time it recovered, but nothing about that was guaranteed, and no scheme would have compensated me if it hadn’t.
So, are stocks and shares ISAs safe from that kind of fall? No, and no honest source will tell you otherwise. This is the trade off of investing rather than saving, and I explain it in full, along with why an emergency fund comes first, in my guide to how to start investing in the UK.
Who this is not for. If you’ll need the money within the next few years, for a house deposit, a big repair or anything with a date attached, a stocks and shares ISA is the wrong home for it. A market fall at the wrong moment turns a paper loss into a real one, and FSCS won’t help. That money belongs in cash.
How your investments are actually held, and why platform failure rarely means total loss
Here’s the part most people never hear, and it’s the reason I’m calm about platform risk rather than anxious.
When you buy a fund or a share through a platform, the platform is the administrator of your investments, not the owner of them. That distinction is written into the rules.
The FCA’s Client Assets Sourcebook (known as CASS) requires firms to make adequate arrangements so as to safeguard clients’ ownership rights, especially in the event of the firm’s insolvency. Under those rules, client assets generally have to be registered in your name or in the name of a nominee company, and not in the platform’s own name. The FCA describes the purpose plainly: the rules exist to keep client money and assets safe if firms fail and exit the market.
In practice, that’s ring fencing. Your holdings are kept separate from the platform’s own money, so if the platform gets into trouble, they shouldn’t be treated as the platform’s assets. I went through how this looks in practice, using Trading 212’s own set up, in my post on whether Trading 212 is safe. Trading 212 says it holds clients’ assets in segregated accounts with a custodian, completely separate from its own assets.
So there are two layers between you and a platform failure.
Layer one is ring fencing. Your investments are held separately, so a failed platform shouldn’t take them down with it.
Layer two is FSCS. If something has still gone wrong and there’s a shortfall in what you’re owed, FSCS can compensate you up to £85,000.
For a platform failure to actually cost you money, the first layer has to fail before the second even comes into play. That’s a much narrower set of circumstances than “the platform goes bust and I lose everything”, which is what most of us picture when we first ask the question.
I want to be straight with you about one thing, though. Ring fencing is a rule, not a guarantee. It depends on firms following it, which is precisely why the second layer exists.
Is my stocks and shares ISA protected on the platforms I’ve reviewed?
I hold all five of my accounts at Interactive Investor. I’ve researched Hargreaves Lansdown and Trading 212 from the outside, without holding accounts there. So for all three, I didn’t rely on a brochure. I went to each firm’s own regulatory information to check who it says it is.
| Platform | FCA authorised firm and reference number | FSCS protection on investments | My full review |
| Interactive Investor | Interactive Investor Services Limited, 141282 | Up to £85,000 per person, per firm | Interactive Investor Review 2026 |
| Hargreaves Lansdown | Hargreaves Lansdown Asset Management Limited, 115248 | Up to £85,000 per person, per firm | Hargreaves Lansdown Review 2026 |
| Trading 212 | Trading 212 UK Ltd., 609146 | Up to £85,000 per person, per firm | Is Trading 212 Safe? |
All three are FCA authorised, and all three sit within FSCS’s £85,000 investment limit. Correct at the time of writing, and worth double checking on the FCA register before you commit any money.
This table tells you they’re protected, not that they’re right for you. Fees, fund choice, phone support and track record differ a great deal between them, and that’s what my best stocks and shares ISA UK 2026 comparison is for.
How to check any platform yourself. It takes two minutes. Search the firm’s name on the FCA register, make sure it shows as authorised, and check that the firm reference number matches the one on the platform’s own website. Do this by typing the address in yourself, not by clicking a link from an advert or a message. The FCA has published a warning about a firm cloning Hargreaves Lansdown’s name, and a convincing copy of a well known platform is exactly where protection quietly disappears.
What about a SIPP? The same logic applies to a SIPP held on a platform, with FSCS protecting up to £85,000 per person, per firm and never against investment risk. I cover pension safety in more detail in are pensions worth it.
Is my money safe in an ISA? Six questions answered
How much is FSCS protection?
For investments, FSCS protects up to £85,000 per eligible person, per authorised firm, if that firm fails and there’s a shortfall in what it holds for you. For cash in savings accounts, including cash ISAs, the deposit limit is £120,000 per person, per firm, which rose on 1 December 2025. Because the limit is per firm, everything you hold with one platform is best treated as sitting under a single limit. Both figures are correct at the time of writing, so check FSCS before relying on them.
Are stocks and shares ISAs protected by FSCS?
Yes, against your platform or provider failing, as long as the firm is authorised by the FCA or the PRA and the investments are eligible. FSCS also warns that some investment products aren’t protected at all, so check any specific product you hold. What FSCS does not do is protect the value of your investments. If your platform is healthy and your funds fall by 20%, that’s investment risk, and FSCS can’t help.
Is my money safe in an ISA?
It depends which kind of safe you mean. Against a platform failing, your investments are ring fenced under FCA rules, with FSCS behind that up to £85,000. Against markets falling, no. A stocks and shares ISA can lose value, sometimes sharply. A cash ISA is different again, protected as a deposit up to £120,000 but open to inflation eating away at what it can buy. The most useful question isn’t “is it safe?” but “safe from what?”
What happens if my ISA provider goes bust?
Your investments are held separately from the platform’s own money, so they aren’t treated as the platform’s to lose. If there’s still a shortfall in what you’re owed, FSCS may be able to compensate you up to £85,000. The exact process depends on how a particular firm fails, so FSCS’s own website is where to look at the time. This is the reason it’s worth choosing an FCA authorised platform in the first place.
Does FSCS cover investment losses?
No. FSCS says it can’t accept claims for poor investment performance, because the value of investments can go down as well as up. And yes, you can lose money in a stocks and shares ISA, particularly if you sell in a downturn or need the money sooner than planned. During the Covid lockdown I watched my own investments fall further and faster than I’d ever seen. They recovered over time, but there’s never a guarantee that any fall will.
Is investing in an ISA risk free?
No. An ISA is a tax wrapper, not a protection wrapper. It keeps your gains and dividends free of UK tax, but it doesn’t change what’s inside it, which can rise and fall. How much risk you take depends on what you hold, and a broad index fund behaves very differently from a handful of individual shares. That’s why I keep to the five year line: only invest money you can leave alone for at least that long, and keep your emergency fund in cash.
So, are stocks and shares ISAs safe? From your platform failing, yes, with two layers of protection standing behind you. From your investments falling in value, no, and no scheme will cover that. Once you can hold both of those truths at the same time, the whole subject stops feeling frightening and starts feeling manageable. Invest what you can leave alone for five years or more, check your platform is authorised, and then do what I learned to do: close the app and let it get on with its job.