Best Investment Platforms UK 2026: Compared by Fees, Range and Service

Choosing among the best investment platforms UK investors use in 2026 is less about brand recognition and more about matching a charging model to your portfolio. A platform is the regulated firm that holds your ISA, SIPP or general investment account, executes your buy and sell instructions, and safeguards your money under Financial Conduct Authority rules. The cost of doing that varies enormously: two people holding the same £100,000 portfolio can pay several hundred pounds a year more or less depending purely on which platform they sit on.

This guide compares seven of the most widely used UK platforms on the two things that actually move the needle over time: what they charge, and what you can hold with them. It also explains how to verify that a platform is genuinely authorised on the FCA Register, and what the £85,000 FSCS limit does and does not protect. Every firm named here is regulated under the FCA's Conduct of Business Sourcebook (COBS) and the retained UK version of MiFID II, and every one must keep your assets segregated under the client-asset rules in CASS 7.

How UK investment platform fees actually work

Platform charges come in two broad shapes. Percentage-fee platforms take an annual cut of the value of your holdings, usually billed monthly, often tapering at higher balances. Flat-fee platforms charge a fixed pound amount regardless of how big your pot grows. On top of the platform fee sits a dealing or trading charge for buying and selling shares, investment trusts and exchange-traded funds, although many platforms levy no dealing charge for buying and selling open-ended funds.

The mathematics matters because percentage fees scale with success. A 0.45% platform fee on a £20,000 ISA is £90 a year, which feels modest. The same percentage on a £250,000 portfolio is £1,125 a year, every year, regardless of whether you trade. A flat £145 annual fee looks expensive on the smaller pot and cheap on the larger one. The crossover point, where a flat fee becomes the cheaper option, is roughly the £30,000 to £50,000 mark for many savers, depending on the exact tariffs and what you hold.

Three further cost layers sit underneath the platform fee and are easy to overlook. First, the ongoing charges figure (OCF) of any fund you buy, which is paid to the fund manager, not the platform. Second, foreign exchange (FX) charges when you buy assets priced in dollars or euros, which can be 0.5% or more per conversion. Third, exit or transfer fees, which most major platforms have now scrapped but a few still levy per holding.

Investment platform fees compared

The table below summarises the headline charging model of each platform for a standard stocks and shares ISA or general investment account. Figures are indicative tariffs as published by the providers and were correct as at June 2026; always confirm the current rate card before opening an account, as platforms adjust tiers periodically.

The pattern is clear. For a small ISA of a few thousand pounds, a no-platform-fee or commission-free option such as InvestEngine or Freetrade can cost almost nothing in account charges, leaving only fund OCFs to pay. For a mid-sized pot, AJ Bell's relatively low 0.25% fund fee and Vanguard's capped 0.15% are competitive. For a large pot well into six figures, Interactive Investor's flat monthly fee usually wins, because the percentage platforms keep charging a slice of an ever-larger balance.

Flat-fee versus percentage-fee platforms: who each suits

The flat-fee versus percentage debate is the single most important cost decision for a UK investor, and it turns entirely on portfolio size. Interactive Investor is the standout flat-fee platform: its monthly subscription does not change whether you hold £50,000 or £500,000, so the effective percentage cost falls as your pot grows. On a £300,000 SIPP, an ii plan at around £21.99 a month works out to roughly £264 a year, while a 0.25% percentage platform would charge about £750 and a 0.45% platform around £1,350 before any taper.

Percentage platforms suit smaller and growing portfolios because you only ever pay a fraction of what you actually hold. Hargreaves Lansdown's 0.45% headline fee is the highest of the percentage group, but it is paired with the deepest research, the widest fund and share universe and a long-established service operation, which some investors value enough to pay for. AJ Bell undercuts HL on the percentage rate while keeping a similar breadth of investments, making it a common middle-ground choice. Bestinvest sits alongside them with a comparable model and the unusual extra of free coaching sessions with qualified advisers, which can be useful for investors who want occasional human guidance without paying for full advice.

The flat-fee structure has one caveat worth naming: on a very small pot, a fixed monthly subscription is proportionally expensive. Someone with a £5,000 ISA paying £4.99 a month is effectively paying around 1.2% a year, far more than a percentage platform would charge at that size. The flat fee only becomes attractive once the pot is large enough that the equivalent percentage falls below what a tiered percentage platform would take.

Commission-free apps and low-cost fund specialists

Three of the platforms here deliberately strip cost out by narrowing what they offer. Freetrade is a mobile-first, commission-free trading app aimed at investors who want to buy individual UK and US shares and ETFs without paying a dealing charge on each trade. Its basic general investment account carries no platform fee, while the ISA and SIPP sit behind monthly plans. The trade-off is that commission-free does not mean cost-free: foreign exchange charges still apply on US shares, and the app is built for self-directed trading rather than deep fund research.

Vanguard takes the opposite route. It is a fund-only platform that lets you hold its own range of index funds and ETFs, nothing else. That restriction is the point: by limiting the menu to its low-cost trackers and applying a 0.15% account fee capped at £375 a year, Vanguard keeps total costs very low for buy-and-hold index investors. It does not suit anyone who wants individual shares, external active funds or investment trusts.

InvestEngine occupies similar territory but with ETFs rather than funds. Its DIY portfolio carries no platform fee at all, only the OCF of the ETFs you buy, with commission-free trading on top. A separate managed option adds a small percentage charge for those who want a ready-built portfolio. Like Vanguard, the restriction (ETFs only, no single shares, funds or investment trusts) is what makes the low cost possible. These three platforms show that the cheapest option is often the one that does less, and the right choice depends on whether you actually need the breadth you would be paying for elsewhere.

Investment range compared

Cost is only half the picture. A platform is no bargain if it cannot hold the assets or the account type you need. The table below compares the breadth of each platform across the main asset classes and the three core tax wrappers: the stocks and shares ISA, the self-invested personal pension (SIPP) and the general investment account (GIA).

The breadth gap is stark at the edges. Hargreaves Lansdown, AJ Bell, Interactive Investor and Bestinvest are full-service platforms that hold essentially every mainstream asset class and all three wrappers, which is why their fees are higher. Vanguard, InvestEngine and Freetrade trade breadth for cost: Vanguard offers only its own funds and ETFs, InvestEngine only ETFs, and Freetrade only listed shares and ETFs with no open-ended funds. An investor who wants to hold investment trusts and active funds inside a SIPP cannot do that on InvestEngine or Vanguard, no matter how cheap they are.

Checking FCA authorisation and what your protection actually covers

Before moving money to any platform, the most important check costs nothing: confirm the firm is authorised. The Financial Conduct Authority maintains a public FCA Register at register.fca.org.uk where you can search a firm's name or its firm reference number. A genuine investment platform will show as authorised with permissions to hold client money and safeguard custody assets. If a firm is not on the Register, or shows only as an appointed representative when it claims to be a full platform, treat that as a serious warning sign and do not deposit funds.

When you search the Register, check three things: that the firm name matches exactly the entity you are about to transfer to, that its status reads "Authorised", and that the listed permissions cover the activity you expect (such as arranging deals in investments and safeguarding and administering assets). Scam operations frequently "clone" the details of a real authorised firm, so use the contact details shown on the Register itself rather than details from an unsolicited email or advert.

How CASS 7 and client-asset rules protect your money

Authorised platforms must follow the FCA's Client Assets Sourcebook, and specifically CASS 7, which governs client money. The core principle is segregation: your cash and your investments are held separately from the platform's own corporate money, typically in pooled client bank accounts and through nominee custody arrangements. If the platform itself were to fail, your assets are ring-fenced and do not form part of the firm's estate available to its creditors. The platform conducts regular reconciliations and is subject to FCA oversight under the Conduct of Business rules in COBS and the retained UK version of MiFID II, which sets the broader conduct framework for investment firms.

What the FSCS £85,000 limit does and does not cover

If something goes wrong that segregation cannot fix, for example a shortfall in client assets caused by fraud or administrative failure when a firm is declared in default, the Financial Services Compensation Scheme can pay compensation of up to £85,000 per eligible person, per failed firm. This is the same headline figure that applies to bank deposits, but it works differently for investments.

The crucial point is what the £85,000 does not cover. FSCS protection is not insurance against your investments losing value. If your fund or shares fall because markets fall, that is investment risk, and no compensation scheme will make it good. The protection applies only to the failure of the regulated firm or to bad advice and misrepresentation from an authorised adviser, not to the ordinary ups and downs of the assets you chose to hold. Because client assets are segregated under CASS 7 in the first place, most platform failures are resolved by transferring holdings to another provider rather than by FSCS payouts, but the £85,000 backstop exists for the shortfall cases.

Matching a platform to your situation

Pulling the fee and range comparisons together produces a few clear patterns. A new investor putting a few thousand pounds into a simple index portfolio pays the least with InvestEngine, Vanguard or Freetrade, where platform charges are minimal or capped and the only meaningful cost is the fund or ETF OCF. The restriction on what they can hold rarely bites for someone buying one or two trackers.

An investor with a mid-sized ISA who wants a wide choice of funds, shares and investment trusts will usually find AJ Bell or Bestinvest the better value among the full-service platforms, with Hargreaves Lansdown commanding a premium for its research and service depth. Anyone with a large pot, particularly a six-figure SIPP, should run the numbers on Interactive Investor's flat fee, which often saves hundreds of pounds a year against any percentage tariff because the cost stops scaling with the balance.

The ISA and pension allowances apply identically whichever platform you choose. The 2026/27 ISA allowance is £20,000 across all ISA types, with the rules confirmed by the Finance Act 2024, and the annual pension contribution allowance is £60,000 for most savers, subject to earnings and tapering for high earners. Those limits, not the platform, determine how much you can shelter from tax each year; the platform simply decides how much of your return the charges quietly absorb.

Frequently asked questions

What is the best investment platform in the UK for beginners?

There is no single answer, but for a beginner starting with a small amount in index funds or ETFs, low-cost or commission-free platforms such as InvestEngine, Vanguard or Freetrade keep charges to a minimum. Investors who want a wider range of funds and shares from day one may prefer a full-service platform such as AJ Bell. The right choice depends on what you intend to hold and how much you are investing.

Is a flat-fee or percentage-fee investment platform cheaper?

It depends almost entirely on pot size. Percentage platforms such as Hargreaves Lansdown and AJ Bell are cheaper on smaller portfolios because you pay only a fraction of a small balance. A flat-fee platform such as Interactive Investor becomes cheaper once the pot is large enough that the equivalent percentage falls below the percentage platforms' rates, often somewhere between £30,000 and £50,000 depending on what you hold.

How do I check if an investment platform is FCA authorised?

Search the firm's name or firm reference number on the FCA Register at register.fca.org.uk. Confirm the entity name matches exactly, that the status reads "Authorised", and that the permissions cover arranging deals and safeguarding assets. Use the contact details shown on the Register itself, because scammers sometimes clone the identity of genuine authorised firms.

Does the FSCS £85,000 limit cover investment losses?

No. The Financial Services Compensation Scheme protects up to £85,000 per person per failed firm against the failure of a regulated firm, fraud or bad advice. It does not compensate you if your investments fall in value because markets fall; that is ordinary investment risk and is never covered by any compensation scheme.

Can I hold an ISA and a SIPP on the same platform?

Yes, on full-service platforms such as Hargreaves Lansdown, AJ Bell, Interactive Investor and Bestinvest you can run a stocks and shares ISA, a SIPP and a general investment account side by side. Some specialist platforms are narrower: Vanguard and InvestEngine offer the main wrappers but restrict the investments inside them, while Freetrade does not offer open-ended funds.

What is the 2026/27 ISA allowance?

The ISA allowance for 2026/27 is £20,000 across all ISA types combined, with the rules confirmed in the Finance Act 2024. You can split that allowance across a cash ISA, a stocks and shares ISA and other ISA types in the same tax year, provided the total does not exceed £20,000.