One of the most common questions UK investors ask when choosing an investment platform is what would happen to their money if the platform itself got into financial difficulty. The answer involves understanding how investments are legally held, what the Financial Services Compensation Scheme (FSCS) actually covers, and where the real risks lie — which are often quite different from what a platform failure might intuitively suggest.
How platforms actually hold your investments
A common misconception is that a platform "holds" your money and investments in the way a bank holds a deposit. In practice, regulated UK investment platforms are required by the Financial Conduct Authority (FCA) to keep client assets segregated from the platform's own corporate assets, under rules known as the Client Assets Sourcebook (CASS). This means that shares, funds, and cash belonging to customers are legally ring-fenced and held separately from the platform's own money — typically in a nominee company structure, where the nominee holds the legal title to investments on behalf of customers, who retain the beneficial ownership.
Why segregation matters
Because client assets are segregated under CASS rules, if a platform becomes insolvent, those assets do not form part of the platform's assets available to its general creditors. In principle, this means customers should be able to have their investments transferred to another platform or returned to them, even if the original platform ceases trading, without needing to rely on compensation at all.
Where FSCS protection comes in
The FSCS exists as a safety net for situations where segregation alone is not enough — for example, where a firm's failure involves fraud, mismanagement of client money, or an administrative shortfall that means not all client assets can be fully accounted for and returned. FSCS protection for investments currently covers up to £85,000 per person, per authorised firm, in the event that a firm is unable to meet its obligations to return client assets or money.
What FSCS protection is designed to cover
- Situations where a firm has gone into default and cannot return investments or money it should be holding on a customer's behalf.
- Losses arising from a firm's failure to comply with its regulatory obligations (for example, negligent advice given by a regulated adviser, if applicable) — though this is distinct from investment platform custody failures specifically.
- Shortfalls that emerge during the administration or liquidation process of a failed firm, where client assets cannot be matched precisely to individual customers.
What FSCS protection does not cover
- Investment losses caused by market movements — if a fund or share falls in value because of normal market performance, FSCS protection does not compensate for that loss under any circumstances.
- The failure of an underlying fund manager or the poor performance of a fund itself, as distinct from the platform holding it.
- Amounts above the £85,000 per-person, per-firm limit, although in practice, because assets are usually segregated and identifiable, actual FSCS payouts triggered purely by platform failure (as opposed to fraud) have historically been rare, since most or all assets are typically returned through the administration process itself rather than through compensation.
Cash versus investments in the FSCS context
It is worth distinguishing between cash held within an investment platform account and cash held in a standalone bank account, because the FSCS deposit protection limit (also £85,000, though assessed separately under the deposit protection rules rather than the investment protection rules) can apply differently depending on how the cash is structured. Some platforms hold uninvested cash in a single pooled client account at a partner bank, in which case the FSCS deposit protection may apply per banking institution across all the platform's customers collectively, potentially meaning individual protection is diluted if the platform holds very large sums with a single banking partner. Other platforms spread client cash across several partner banks specifically to maximise the FSCS deposit protection available to each individual customer. This is a detail worth checking with a specific platform if a large uninvested cash balance is likely to sit in the account for any length of time.
A worked hypothetical example
Suppose an investor holds £120,000 in a Stocks and Shares ISA on a platform that subsequently becomes insolvent, and suppose (purely hypothetically) that a portion of client assets cannot be immediately reconciled during the administration process, resulting in a shortfall attributable to that investor of £30,000.
| Scenario | Outcome |
|---|---|
| Assets fully segregated and reconciled | All £120,000 in investments is identified and transferred to another platform or returned; no FSCS claim needed. |
| Shortfall of £30,000 identified during administration | FSCS compensation would apply up to £85,000 of any confirmed shortfall — in this hypothetical, the full £30,000 shortfall would fall within the £85,000 limit and could, in principle, be covered. |
| Hypothetical larger shortfall of £100,000 | Only £85,000 of the shortfall would be covered by FSCS protection; the remaining £15,000 would depend on the outcome of the administration process, with no guarantee of recovery. |
This example is entirely hypothetical and illustrative — actual FSCS claims depend on the specific circumstances of a firm's failure, and full shortfalls of this kind are uncommon precisely because of the CASS segregation rules described above. It is included to illustrate how the £85,000 limit interacts with a shortfall, not to suggest that such shortfalls are typical or expected.
Reducing platform-related risk in practice
Checking FCA authorisation
Any UK investment platform accepting retail customers should be authorised and regulated by the FCA, and this can be checked directly on the FCA's Financial Services Register. Authorisation brings with it the CASS segregation rules and eligibility for FSCS protection.
Spreading very large holdings
Because the £85,000 FSCS limit applies per person, per authorised firm, some investors with substantial total wealth choose to spread very large portfolios across more than one platform, on the view that this may reduce the practical impact of an unlikely worst-case administration shortfall, even though, as noted, the underlying investments themselves remain segregated and are not typically at risk from market-independent platform failure in the way a bank deposit might be.
Minimising large uninvested cash balances
Because FSCS deposit protection interacts differently with pooled cash arrangements, keeping large sums of cash sitting uninvested on a platform for extended periods is sometimes viewed as carrying a marginally different risk profile than holding the same value in invested assets, which is one of several reasons investors may prefer not to leave large cash balances languishing on a platform indefinitely.
Platform failure versus fund manager failure
It is worth clearly separating two distinct risks that are sometimes conflated: the risk of the platform itself failing, and the risk of an underlying fund manager failing. A platform is essentially an administrative and custodial layer — it does not typically manage the investments itself, but provides access to funds run by separate authorised fund managers. If a fund manager were to fail, the fund's assets are themselves held separately from the fund manager's own corporate assets, under similar segregation principles enforced by the FCA, and would typically be transferred to another manager to continue running the fund, or wound up in an orderly fashion with assets returned to investors. This is a separate protective structure from the platform-level CASS segregation described above, and both layers exist specifically so that neither a platform's nor a fund manager's own financial difficulties should, in ordinary circumstances, result in the underlying investments simply disappearing.
FSCS protection within pensions and other wrappers
The £85,000 FSCS investment protection limit generally applies per person, per firm, regardless of whether the underlying investments sit within a Stocks and Shares ISA, a SIPP, a Junior ISA, or a general investment account, since the protection relates to the firm holding the assets rather than the tax wrapper itself. However, SIPPs can sometimes involve an additional layer — a SIPP operator and a separate SIPP trustee — and it is worth being aware that pension-specific compensation rules can differ in some circumstances from those applying to straightforward ISA or general investment holdings, particularly where advice was given as part of setting up the pension. Investors with SIPP holdings who want certainty about how protection applies to their specific arrangement can check directly with the SIPP operator or consult the FSCS's own published guidance for pensions.
Multiple accounts with the same platform group
Where an investor holds several accounts (for example, an ISA and a SIPP) with providers that are technically different authorised firms but part of the same corporate group, the £85,000 limit may apply separately to each authorised firm rather than being combined across the group, or it may not, depending on the specific corporate and regulatory structure involved. This nuance is easy to overlook and worth clarifying directly with a provider if the total value held across a group's various products approaches or exceeds the protection limit.
Key takeaways
- UK investment platforms are required to segregate client assets from their own corporate assets under FCA Client Assets Sourcebook (CASS) rules, so investments are not simply "at risk" if a platform fails.
- FSCS investment protection covers up to £85,000 per person, per authorised firm, primarily for situations involving shortfalls, fraud, or mismanagement rather than ordinary market losses.
- FSCS protection never compensates for investment losses caused by normal market performance or poor fund returns.
- Cash held on a platform may be pooled with a partner bank, and how this interacts with FSCS deposit protection can vary between platforms.
- Checking a platform's FCA authorisation status on the Financial Services Register is a straightforward first step in assessing its regulatory standing.
- Full FSCS payouts triggered purely by platform administrative failure are historically uncommon, since segregated client assets are usually identifiable and returnable through the administration process itself.