Stocks and Shares ISAs are safe in one important sense and risky in another, and the distinction is what most people get wrong. If you’re asking whether Stocks and Shares ISAs are safe, the short answer is that your money is well protected against your provider failing, but not at all protected against your investments falling in value. The Financial Services Compensation Scheme covers up to £85,000 per person, per firm if an authorised provider goes bust, and FCA rules require your assets to be held separately from the firm’s own money in the first place.1FSCS. Investments What no one will compensate you for is a bad year in the markets.
The Loss No One Will Reimburse
The value of a Stocks and Shares ISA moves with whatever you’ve invested in: company shares, government or corporate bonds, or investment funds.2GOV.UK. Individual Savings Accounts (ISAs): How ISAs work Unlike a Cash ISA, the balance can fall on any given day. A weak earnings report, a global downturn, or rising interest rates can all reduce what your account is worth, and that loss sits with you. The FSCS does not accept claims based on poor performance, and no government programme reimburses market declines.1FSCS. Investments
FCA rules require providers to say so plainly. Any financial promotion involving investments must warn that capital is at risk, and past performance cannot be shown in a way that implies future returns are guaranteed.3Financial Services Authority. Financial Promotions Fund Performance and Image Advertising FG12/11 The disclosure exists because your portfolio strategy, not a regulator, is the primary defence against investment loss.
Inflation is the quieter risk. Even when your ISA grows in cash terms, rising prices erode the real value of those gains. A 4% return in a year of 3% inflation is closer to 1% in practical terms, and over a long holding period that gap compounds. The tax-free wrapper helps because you keep more of whatever growth you achieve, but it does not solve the problem. A portfolio that consistently trails inflation is losing ground even as the balance climbs.
What Happens if Your Provider Goes Bust
This is the risk most people actually worry about, and it is the one the rules address most directly. There are two layers of protection, and the first one usually does most of the work.
Segregation Comes First
Under the FCA’s Client Assets rules, firms must keep your money and investments entirely separate from their own operating funds.4Financial Conduct Authority. FCA Handbook – CASS 5.5 Segregation and the Operation of Client Money Accounts Cash sitting in your ISA is held in designated client bank accounts. Your actual holdings are held in a way that safeguards your ownership, typically through a nominee account where the platform is the named holder but you retain beneficial ownership.5Financial Conduct Authority. CASS 6 Custody Rules If the firm fails, those assets should be identifiable as yours and off-limits to the firm’s creditors.
When a firm enters administration, an insolvency practitioner is appointed to return those segregated assets. In most cases, the bulk of your portfolio comes back without the FSCS needing to step in. There is a catch. The costs of distributing client money during insolvency can be deducted from the pool of client assets before it’s returned.6FCA Handbook. CASS Client Assets If records were poor or the firm mishandled assets and there’s a genuine shortfall, you may get back less than expected.
The FSCS Backstop
That gap is where the Financial Services Compensation Scheme comes in. The FSCS is a statutory fund that compensates customers of authorised firms that become insolvent or stop trading. For investment claims, the limit is £85,000 per eligible person, per firm.1FSCS. Investments
Two conditions matter. The firm has to be authorised by the FCA or the Prudential Regulation Authority, which you can verify through the FCA’s Financial Services Register before opening an account.1FSCS. Investments And the loss has to come from the firm’s failure or from regulated bad advice, not from your investments performing badly. If a company whose shares you hold goes bankrupt or a fund you chose drops 40%, that’s market risk and it stays with you.
When £85,000 Isn’t Enough
The per-firm cap matters most for anyone concentrating large sums with a single provider. If you hold £120,000 with one platform and it collapses with a shortfall in client assets, the FSCS covers £85,000 and the remaining £35,000 is at risk. The straightforward fix is to split holdings across separately authorised firms. Check that they are genuinely separate legal entities rather than trading names of the same parent, because the limit applies per authorised firm, not per brand.7FSCS. What We Cover
Bad Advice and Poor Service
The compensation system covers more than firm failure. If a regulated adviser recommended an unsuitable investment and you lost money as a result, the FSCS can compensate up to £85,000 for that claim, provided the advice was given on or after 28 August 1988.1FSCS. Investments
If your provider hasn’t failed but has treated you badly, the Financial Ombudsman Service handles complaints about administrative errors, negligent advice, and mis-sold products. The FOS is free to use and its decisions are legally binding on the firm. For complaints referred on or after 1 April 2025 about problems that occurred on or after 1 April 2019, the maximum award is £445,000.8Financial Ombudsman Service. Compensation Earlier complaints fall under lower caps.
Timing is unforgiving. You generally need to raise the issue within six years of the problem, or three years from the point you became aware of it. Once the firm sends its final response, you have six months to escalate to the FOS.9Financial Ombudsman Service. Time Limits Miss that six-month window and the ombudsman will usually decline to look at it, regardless of the merits. The firm’s final response letter has to tell you about the deadline. Watch for it.
Other Situations That Can Cost You
The Transfer Window
Moving your ISA between providers introduces a window of vulnerability that catches many investors off guard. There are two options: a cash transfer, where your investments are sold and the proceeds sent across, and an in-specie transfer, where your holdings move without being sold. Cash transfers are faster but force you to sell and repurchase, exposing you to price movements during the gap. In-specie transfers preserve your positions but take longer.
Cash ISA transfers should complete within 15 working days, and other types within 30 calendar days.10GOV.UK. Individual Savings Accounts (ISAs): Transferring Your ISA In practice, an in-specie move involving re-registration can stretch to eight or twelve weeks, and during that time you may not be able to trade the affected holdings. Always use the formal ISA transfer process. If you withdraw the money and redeposit it, the withdrawal counts as a withdrawal and the redeposit eats into your annual allowance.
Breaching the Allowance
The annual ISA subscription limit is £20,000 across all your ISA accounts for the 2026/27 tax year, and that figure has been frozen until at least 2030.2GOV.UK. Individual Savings Accounts (ISAs): How ISAs work The cap covers Cash ISAs, Stocks and Shares ISAs, Innovative Finance ISAs, and Lifetime ISAs combined, in the tax year running from 6 April to 5 April.
Since April 2024, you can open and contribute to more than one Stocks and Shares ISA in the same tax year, but the overall £20,000 cap still applies. If you accidentally exceed the limit, HMRC can require the excess and any growth on it to come out of the tax-free wrapper, and you may owe tax on the gains or income from the overcontribution.
Moving Abroad
To subscribe to any ISA, you must be at least 18 and either resident in the UK or a Crown employee serving overseas (or their spouse or civil partner).11GOV.UK. Who Can Invest in an ISA if You’re an ISA Manager If you move abroad and stop meeting the residence test, you don’t have to close the account, but you cannot make new contributions until you qualify again. Your existing investments stay in the tax-free wrapper. You are required to tell your ISA manager when your residency changes.
What Happens When You Die
A Stocks and Shares ISA doesn’t lose its tax-free status the moment the holder dies. It continues as a “continuing account of a deceased investor,” with no income tax or capital gains tax due until the ISA formally ends.12GOV.UK. Individual Savings Accounts (ISAs): If You Die The ISA investments do, however, form part of the estate for inheritance tax purposes. The wrapper shields against income and capital gains tax. It doesn’t shield against IHT. A surviving spouse or civil partner receives an additional ISA allowance equal to the value of the deceased’s ISA holdings, which can be used to shelter that inherited wealth in their own ISA going forward.