Your investment platform is where you hold and manage your Stocks and Shares ISA, pension, and other investment accounts. Choosing the right one can save you thousands in fees over your investing lifetime. This guide compares the main UK platforms and helps you find the best fit for your situation.
Types of Investment Platform
| Type | Examples | Best For |
|---|---|---|
| DIY platforms | interactive investor, Hargreaves Lansdown, AJ Bell | Experienced investors who want full control |
| Managed platforms | Nutmeg, Wealthify, Moneyfarm | Hands-off investors who want professionals to manage their money |
| Fund supermarkets | Vanguard Investor, Fidelity | Investors focused on that provider’s funds |
| Trading platforms | Trading 212, Freetrade | Frequent traders and share-pickers |
Fee Structures Explained
Platform fees are the single most important factor in your long-term returns. There are two main structures:
Percentage-Based Fees
You pay a percentage of your total portfolio value each year. This is cheap for small portfolios but increasingly expensive as your wealth grows.
Flat Fees
You pay a fixed monthly or annual fee regardless of your portfolio size. This is expensive when your portfolio is small but becomes excellent value as it grows.
Crossover Point
There is a portfolio size at which flat fees become cheaper than percentage fees. For example:
| Portfolio Value | Percentage Fee (0.25%) | Flat Fee (£143/year) | Cheapest |
|---|---|---|---|
| £20,000 | £50 | £143 | Percentage |
| £50,000 | £125 | £143 | Percentage |
| £60,000 | £150 | £143 | Flat |
| £100,000 | £250 | £143 | Flat |
| £250,000 | £625 | £143 | Flat |
| £500,000 | £1,250 | £143 | Flat |
The crossover is around £57,000 in this example. Below that, percentage-based is cheaper. Above that, flat fee saves you money.
Platform Comparison
For Small Portfolios (Under £30,000)
| Platform | Annual Fee | Investment Range | Regular Investing | Best For |
|---|---|---|---|---|
| InvestEngine | 0% (DIY) | ETFs only | Yes (free) | Pure ETF investors |
| Vanguard Investor | 0.15% (capped at £375) | Vanguard funds and ETFs only | Yes (free) | Simple index investing |
| Trading 212 | 0% | Shares and ETFs | Yes | Cost-conscious investors |
For Medium Portfolios (£30,000–£100,000)
| Platform | Annual Fee | Investment Range | Regular Investing | Best For |
|---|---|---|---|---|
| Vanguard Investor | 0.15% | Vanguard only | Yes | Index fund investors |
| AJ Bell | 0.25% (capped) | Funds, shares, ETFs, bonds | Yes (£1.50/trade) | Mix of funds and shares |
| interactive investor | £11.99/month | Funds, shares, ETFs, trusts | Yes (free) | Growing portfolios |
For Large Portfolios (£100,000+)
| Platform | Annual Fee | Investment Range | Best For |
|---|---|---|---|
| interactive investor | £11.99/month | Comprehensive | Best value for large portfolios |
| Hargreaves Lansdown | 0.45% (capped for shares) | Comprehensive | Research and service quality |
| AJ Bell | 0.25% (capped for shares) | Comprehensive | Good balance of cost and features |
Beyond Platform Fees
Remember that platform fees are only part of the cost. You also pay:
- Fund management charges (OCF/TER) — typically 0.05–0.25% for index funds or 0.50–1.50% for active funds
- Trading fees — some platforms charge per trade (£0–£12), others include free trades with your subscription
- Foreign exchange fees — for buying overseas shares (typically 0.15–1.50%)
- Exit fees — some platforms charge for transferring away (£25–£100+ per fund)
Accounts Available
| Account Type | Tax Benefit | Available on Most Platforms? |
|---|---|---|
| Stocks and Shares ISA | Tax-free returns | Yes |
| Cash ISA | Tax-free interest | Some |
| Lifetime ISA | 25% government bonus | Some |
| SIPP (pension) | Tax relief on contributions | Most |
| Junior ISA | Tax-free, child’s account | Some |
| General investment account | No tax benefit | Yes |
How to Choose
- Determine your portfolio size — this drives whether percentage or flat fee is cheaper
- Decide on investment style — index funds only? Individual shares? Both?
- Check account types — do you need an ISA, SIPP, LISA, or all of them?
- Compare total annual fees — platform fee + fund charges + trading costs
- Consider the user experience — a clunky interface can discourage you from investing regularly
- Check transfer-in policies — can you transfer existing ISAs and pensions easily?
- Read reviews — particularly around customer service and reliability
Switching Platforms
If you are on an expensive platform, switching can save you significant money over time. The process:
- Open an account on the new platform
- Request a transfer — the new platform handles the process
- Wait — ISA transfers take 2–4 weeks; SIPP transfers can take 4–8 weeks
- Verify — check all investments have transferred correctly
Most transfers happen “in specie” — your investments transfer without being sold first, so you stay invested throughout the process and pay no capital gains tax.