Choosing an ISA platform in 2026 is about more than promotional offers and headline features. With the upcoming £12,000 Cash ISA cap for under-65s from April 2027 and higher dividend tax rates affecting investors, selecting the right platform can play an important role in protecting long-term returns.
Our Best ISA Platforms 2026 guide compares providers by investor type, because the most cost-effective platform for a £5,000 portfolio may not be the best choice for someone investing £100,000. The right option depends on factors such as fees, investment choices, account features and how often you trade.
2026 Quick-View Fee Table
| Platform | Fees | Investment Options | Best For |
|---|---|---|---|
| InvestEngine | Platform fees: £0 Trading fees: £0 (ETFs only) |
ETFs only | Lowest cost DIY investors |
| Robinhood | Platform fees: £0 Trading fees: £0 (ETFs only) |
US stocks only | Lowest cost for US stocks |
| Vanguard UK | Platform fees: £48–£375/yr (capped) Trading fees: £0 (funds only) |
Vanguard index funds | Low cost passive investors |
| Interactive Investor | Platform fees: £60/yr (£5.99/mo) up to £100k Trading fees: ~£3.99 per trade |
Shares & ETFs | Mature portfolios avoiding % fees |
| AJ Bell | Platform fees: ~0.25% annual Trading fees: £1.50–£5 per trade |
Shares, ETFs, Funds | Multi-account family investing |
| Fidelity | Platform fees: ~0.35% annual Trading fees: ~£7.50 per trade |
Shares, ETFs, Funds | Balanced cost and service |
| Hargreaves Lansdown | Platform fees: ~0.45% annual Trading fees: £11.95 per trade |
Shares, ETFs, Funds | Research-heavy, full-service platform |
| Trading 212 | Platform fees: £0 Trading fees: £0 (FX fee applies) |
Shares, ETFs, Fractional shares | Active, cost-sensitive traders |
| Freetrade | Platform fees: £0 Trading fees: £0 (FX fee on non-GBP) |
Shares, ETFs, Fractional shares | Simple, app-first investing |
| Bestinvest | Platform fees: 0.2–0.4% annual (tiered by portfolio size, drops to 0 above £1m) Trading fees: £4.95 per UK trade / 0.95% FX fee on US stocks, funds free |
Shares, ETFs, Funds, Ready-made Portfolios | Mid-to-large portfolios, scalable fees, investors wanting flexibility with guidance |
Indie Tip
Always compare fees as a % of your current and projected portfolio size, not just the headline £0 platform fee. A flat-fee platform like Interactive Investor or Bestinvest can become cheaper on larger balances, even if a beginner would pay more.
Best Of The Bunch
InvestEngine: The ETF Specialist
InvestEngine remains the cheapest option for the passive set and forget investor.
By charging £0 platform fees for DIY portfolios, they have essentially commoditised the ISA. In 2026, their standout feature is Smart Rebalancing, which keeps your portfolio weighted correctly without you having to lift a finger.
Indie Insight
You are restricted to ETFs. If you want to own a slice of individual UK companies or active mutual funds, you’ll need to look elsewhere.
Robinhood: The Wall Street Specialist
Robinhood is the 2026 disruptor for investors who prioritise Wall Street access and raw cost-efficiency.
By offering a 0.10% FX fee and $0 commission, they have made trading US stocks cheaper than any other mainstream UK rival. The platform is designed for those who want a high-tech, low-cost gateway to the American markets, featuring advanced charting and simplified options trading that were previously difficult for UK retail investors to access.
Indie Insight
You are strictly limited to US-listed stocks and options. If you want to invest in the FTSE 100, UK Gilts, or European markets, Robinhood cannot be your only platform.
Trading 212: The Low Cost Specialist
Trading 212 is the 2026 champion for active investors and those who need their money to stay liquid.
They offer a fully Flexible ISA, meaning you can withdraw and replace cash within the same tax year without it counting against your £20,000 limit. With 0.15% FX fees, they are significantly cheaper than Freetrade for US stocks.
Indie Insight
No SIPP (pension) or JISA support, meaning it can’t be your all-in-one family hub.
Freetrade: The Middle Ground
In a massive shift for 2026, Freetrade now offers its ISA and SIPP accounts for £0 on the Basic plan.
Previously, you had to pay £4.99/month for an ISA or £9.99 for a SIPP. Now, anyone can access thousands of stocks, ETFs, mututal funds and gilts for free.
The Standard (£5.99/mo) or £11.99/month (Plus) plans are now primarily for those who want lower FX fees or better returns on uninvested cash.
Indie Insight
Their 0.99% FX fee on the Basic plan is high. If you trade US stocks frequently, Trading 212 is cheaper.
Vanguard UK: The Default Choice
Vanguard is no longer the cheap option for small portfolios.
Due to Vanguard’s £4/month minimum, a £1,000 portfolio effectively pays 4.8% a year, a heavy drag on returns. The platform only becomes cost‑competitive once your portfolio reaches around £32,000.
Indie Insight
You are locked into the Vanguard ecosystem. If another provider launches a better fund, you can’t buy it here.
AJ Bell: The All-Rounder
AJ Bell is the best all-rounder for those who want a massive range of assets without the Hargreaves Lansdown price tag.
Their 0.25% fee is fair, and their Dodl app offers a simplified 0.15% experience for those who find the main platform too complex.
Indie Insight
They still charge for fund trades (£1.50) and share trades (£5.00), which can eat into your pot if you trade monthly.
Interactive Investor (ii)
From February 1, 2026, Interactive Investor will simplify its pricing into a new Core Plan at £5.99/month.
This plan now covers portfolios up to £100,000 (doubled from the previous £50k limit). This makes ii the absolute best value for anyone with a mid-to-large pot. It includes an ISA, SIPP, and GIA all for one flat fee.
Interactive Investor have dropped their FX fees to a flat 0.75% for the Core plan, which makes them more competitive for occasional US stock buyers.
Indie Insight
If you have a small portfolio, a flat monthly fee is much more expensive than a percentage-based one.
Hargreaves Lansdown: Premium Research
Hargreaves Lansdown (HL) remains the most expensive at 0.45%, but they lead the market in service and research.
For the Indie investor, HL is only cost-effective if you hold Shares/ETFs, where the fee is capped at £45/year. If you hold mutual funds, the 0.45% is uncapped and can become your single biggest investment cost.
Indie Insight
The 0.45% tax on funds.
Fidelity: The Mutual Fund Specialist
Fidelity is the specialist for those who prefer Mutual Funds over ETFs.
While their 0.35% fee sounds high, they have a £90/year cap if you only hold exchange-traded assets (Shares/ETFs). This makes them a surprisingly cheap premium choice for large ETF portfolios.
Indie Insight
Their share dealing fee is £7.50, making them expensive for frequent traders.
Bestinvest: Tiered Fees With Competitive Dealing
Bestinvest sits between flat‑fee platforms like Interactive Investor and low‑cost app brokers like Trading 212 and Freetrade. Its tiered service fee means it becomes more cost‑efficient as your balance grows and can undercut percentage‑based providers on larger pots, especially if you invest in ready‑made portfolios or US stocks without hefty dealing fees.
The platform also includes free coaching and planning tools, which may appeal to investors who want support beyond pure execution.
Indie Insight
Bestinvest is a scalable platform with fees that shrinks as a portfolio grows. It’s not the cheapest for tiny pots, but its tiering makes it competitive once you’re well past the entry levels.
Comparison Summary for your 2026 Strategy
| Goal | Recommended Platform | Why? |
|---|---|---|
| Small Pot (<£10k) | InvestEngine | Truly £0. Avoids Vanguard’s £4/mo hidden floor. |
| Beginner Stockpicker | Freetrade (Basic) | ISA is now £0. Ideal for learning without monthly overhead. |
| Active / US Trading | Trading 212 | Lowest FX fees (0.15%) plus fractional shares. |
| Mature Pot (£35k–£100k) | Interactive Investor | The £5.99 Core Plan undercuts Vanguard on cost above ~£40k. |
| Scalable / Growing Portfolio | Bestinvest | Tiered platform fee drops as your portfolio grows, competitive dealing on UK & US shares, ideal for mid-to-large investors who want flexibility and guidance. |
| The “I Want Everything” Investor | AJ Bell | Best range of SIPP, JISA, and funds for a 0.25% platform fee. |
The Exit Strategy
Choosing the right platform is only half the battle; the other half is moving your money there without triggering a tax bill or missing out on market gains.
Most investors make the mistake of withdrawing their cash to move it manually. Do not do this. Withdrawing your funds removes them from the ISA wrapper, meaning you lose that portion of your tax-free allowance forever. Instead, you must use the Official ISA Transfer Service.
Cash Transfer vs. In-Specie: Which is better?
- Cash Transfer: Your current provider sells your investments and sends the cash to the new platform. It’s faster (usually 15–30 days) but means you are out of the market and could miss a sudden price surge.
- In-Specie Transfer: Your actual shares and fund units are moved over without being sold. This keeps you invested throughout the process, but it can take longer (4–8 weeks) and is only possible if your new platform offers the exact same assets.
Indie Tip
In 2026, most major platforms like Interactive Investor and AJ Bell will pay your exit fees (up to a certain limit) if your old broker charges you to leave. Always check for a transfer incentive before you hit the button.
Read our full step-by-step guide on how to perform an In-Specie transfer from current ISA platform.
Indie Investor’s Top Picks for 2026
| # | Platform | Why It’s Best | Link |
|---|---|---|---|
| 1 | InvestEngine | £0 platform fee for DIY portfolios. Perfect for passive investors buying low-cost ETFs like Vanguard All-World or S&P 500. | Explore InvestEngine’s £0 ISA → |
| 2 | Interactive Investor (ii) | Best for large portfolios. Core Plan £5.99/month beats percentage fees once your balance exceeds £40k. | View ii’s New Core Plan Fees → |
| 3 | Trading 212 | Flexible ISA status lets you withdraw and replace funds without affecting your £20k allowance — ideal for active flexibility. | See Trading 212’s ISA Interest Rates → |
VS The Competition
Compare how different investing platforms stack up, highlighting differences in fees, features, market access, and tools so you can see which best fits your investing style.
