Once an investor has decided which index funds to buy, a less glamorous but equally consequential decision remains: where to actually hold them. UK investors broadly choose between a multi-fund platform, which offers funds from many different providers in one account, and going directly to a single fund management group's own dealing service. Both routes can work well, but they carry different trade-offs around cost, choice, and convenience.
What a fund platform offers
A multi-fund platform (sometimes called a fund supermarket) allows an investor to hold funds, ETFs, and often individual shares from many different providers within a single account, alongside a single login, a consolidated view of the whole portfolio, and typically ISA and SIPP wrappers available in one place.
Advantages of a platform
- Wide fund choice, often including options from dozens or hundreds of different fund managers.
- A single consolidated account for reporting, tax documentation, and monitoring overall performance.
- Ability to combine different fund providers, ETFs, and sometimes shares, within one ISA or SIPP.
- Often includes useful tools such as fund research, comparison charts, and model portfolios.
Costs typically involved
Most platforms charge an annual platform fee, often as a percentage of assets held (sometimes tiered, reducing as the portfolio grows, or capped at a maximum amount for fund-only holdings), in addition to each underlying fund's own ongoing charges figure.
What a direct fund provider offers
Investing directly with a single fund management group means dealing only in that provider's own range of funds, through their own dealing account, ISA, or SIPP, without the layer of a separate platform in between.
Advantages of going direct
- Can sometimes avoid a separate platform fee altogether, since the investor deals directly with the fund manager.
- Simpler if an investor is confident they only want exposure to a single provider's fund range.
Limitations of going direct
- Limited to that provider's own funds, meaning building a diversified portfolio across multiple fund houses would require separate accounts with each one.
- Holding accounts with several different direct providers can create more administrative complexity than a single consolidated platform.
- Comparison tools and independent research are often less comprehensive than on a dedicated platform built for comparing many providers.
Comparing the two routes
| Feature | Multi-fund platform | Direct fund provider |
|---|---|---|
| Fund choice | Wide, often multiple providers | Limited to one provider's range |
| Platform fee | Usually charged, often percentage-based | Often none, or a smaller administration fee |
| Consolidated reporting | Single account across providers | Separate account needed per provider |
| Research and comparison tools | Often comprehensive | Limited to that provider's own materials |
| Best suited to | Investors wanting a diversified, multi-provider portfolio in one place | Investors confident in a single provider's fund range |
How platform charges are structured
Percentage-based platform fees
Many platforms charge a percentage of the total value held, sometimes reducing at higher portfolio values (a tiered structure), and sometimes capped at a maximum pounds-and-pence amount for fund holdings, meaning the percentage effectively falls further as a portfolio grows beyond the cap threshold.
Flat fee structures
Some platforms instead charge a fixed pounds amount per year (or per quarter), regardless of portfolio size, which can be more cost-effective for larger portfolios and less so for smaller ones.
Additional charges to check
- Dealing charges for buying or selling funds, ETFs, or shares.
- Charges for holding a SIPP specifically, which can sometimes differ from the ISA or general account fee on the same platform.
- Exit or transfer-out fees, charged by some providers if closing an account or transferring to another platform.
A worked example: comparing total cost
Suppose a hypothetical investor holds £40,000 across funds from three different fund management groups. On a multi-fund platform charging 0.35% a year (capped at £375 for fund-only holdings) plus the underlying funds' own ongoing charges averaging 0.30%, the total annual cost would be roughly £140 (platform fee) plus £120 (fund charges), totalling around £260, or about 0.65% of the portfolio. Achieving the same diversified exposure by holding three separate direct accounts, each potentially charging a smaller account fee of, say, £30-£50 a year regardless of platform fee, might total a broadly similar or occasionally lower cost, but would require managing three separate logins, three sets of tax paperwork, and no single consolidated view of overall asset allocation. This example uses simplified, hypothetical figures for illustration, and actual charges vary considerably by provider and portfolio composition.
Practical considerations when choosing
- Estimate the total annual cost (platform fee plus fund charges plus any dealing charges) for a realistic portfolio size and composition, rather than comparing headline percentages alone.
- Consider how many different fund providers are wanted in the portfolio, since this affects whether a multi-fund platform's convenience outweighs any additional fee.
- Check whether ISA and SIPP wrappers are available on the same platform, and whether fees differ between account types.
- Check exit and transfer fees before committing, in case a future move to a different platform becomes desirable.
- Consider the quality of research tools, customer service, and reporting, which can matter as much as headline cost for many investors.
Hybrid approaches some investors use
Combining a core platform with a specific direct holding
Some investors use a multi-fund platform as their primary account for most holdings, while separately holding a specific fund directly with a provider whose range is not available, or is more expensive to access, on their main platform — accepting the added complexity of a second account for a specific reason, such as access to a particular specialist strategy.
Switching platforms over time
As portfolios grow, or as platform pricing structures change, some investors periodically review whether their current platform remains competitive, and transfer holdings to a different platform if a meaningfully better combination of cost, fund range, and service becomes available elsewhere. This is generally done via an "in-specie" transfer (moving the actual fund holdings rather than selling to cash and reinvesting), which can avoid triggering a taxable disposal outside an ISA or SIPP, though transfer times and any transfer-out fees from the losing platform are worth checking in advance.
The role of customer service and platform reliability
Beyond pure cost comparison, platform reliability, the quality of customer support, the usability of the platform's website or app, and the range of account types offered (ISA, SIPP, Junior ISA, Lifetime ISA, and general investment account, for example) are all practical factors that can matter as much as headline fees for many investors' day-to-day experience of managing their investments.
Considering account consolidation for existing holdings
Investors who have accumulated funds across several different accounts over time — perhaps a legacy direct holding from years ago, alongside a newer platform account — sometimes find that consolidating everything onto a single multi-fund platform simplifies annual tax reporting, beneficiary nominations, and ongoing portfolio monitoring, even if the pure headline cost comparison is roughly neutral, since the value of a single, clear overview of total assets should not be underestimated when planning for the long term.
How to run a fair cost comparison before switching or choosing
A useful practical exercise is to model the total annual cost of a realistic, specific portfolio on two or three candidate platforms (or a platform versus a direct-provider combination), using actual current fee schedules rather than relying on marketing summaries, and projecting the comparison forward as the portfolio is expected to grow, since percentage-based and flat-fee structures scale very differently as assets increase. Many comparison websites and the platforms' own websites publish current fee tables that make this modelling exercise straightforward, and it is generally worth repeating every few years as circumstances and available offers change.
Where regulation fits into platform selection
Any UK investment platform holding retail client money and investments should be authorised and regulated by the Financial Conduct Authority (FCA), and eligible investments are typically protected up to the relevant Financial Services Compensation Scheme (FSCS) limit in the event of the platform's own insolvency, distinct from investment risk itself. Checking a platform's FCA registration and FSCS coverage is a sensible baseline step before opening any account, whether choosing a multi-fund platform or a direct provider.
A note on model portfolios and ready-made options
Many multi-fund platforms, and increasingly some direct providers too, offer ready-made model portfolios or managed solutions, combining a diversified selection of funds into a single product aligned to a stated risk level, aimed at investors who prefer not to select and manage individual fund holdings themselves. These typically carry an additional layer of charge on top of the underlying fund costs and any platform fee, and it is worth understanding this combined cost when comparing a ready-made option against building a similar diversified portfolio manually from individual funds.
A final word on switching costs
Because switching between platforms, or between a platform and a direct provider, involves time, potential transfer fees, and occasionally a period where investments are briefly out of the market during an in-specie transfer, it is worth choosing carefully at the outset rather than expecting to switch frequently. That said, platforms and direct providers do compete on price and service over time, so periodically confirming that an existing arrangement remains reasonably competitive is a sensible long-term habit, even if frequent switching is generally best avoided.
Key takeaways
- Multi-fund platforms offer wide choice and consolidated reporting across providers, usually for a platform fee in addition to underlying fund charges.
- Direct fund provider accounts can sometimes avoid a separate platform fee but limit choice to a single fund range.
- Platform fee structures vary between percentage-based (sometimes tiered or capped) and flat annual fees, which suit different portfolio sizes differently.
- Total cost — not headline platform fee alone — should be estimated against a realistic portfolio size and number of desired providers.
- Checking exit and transfer fees before committing helps avoid unexpected costs if switching platforms later.