Shelter dividends from 35.75% tax and gains from 24% — Vanguard · AJ Bell · Interactive Investor · HL compared
At the 40% tax rate, an ISA is not just a nice-to-have — it is your most powerful tool for protecting investment returns from tax. Outside an ISA, higher-rate taxpayers pay 35.75% on dividends (above a £500 allowance), 24% on capital gains (above £3,000), and up to 40% on savings interest above the £500 Personal Savings Allowance. Inside an ISA, all of that falls to zero.
| Income type | Outside ISA (40% taxpayer) | Inside ISA | Annual saving on £5,000 |
|---|---|---|---|
| Dividends | 35.75% above £500 allowance | 0% | Up to £1,519 |
| Capital gains | 24% above £3,000 allowance | 0% | Up to £480 |
| Interest | 40% above £500 PSA | 0% | Up to £1,800 |
Cash ISAs protect interest income, but the real gain for higher-rate taxpayers is in Stocks & Shares ISAs — sheltering dividend income and capital gains over the long term. With a £500 PSA and a £3,000 CGT allowance outside an ISA, higher-rate taxpayers exhaust these allowances relatively quickly on any meaningful portfolio.
Vanguard's 0.15% platform fee capped at £375/yr makes it the cheapest percentage-fee platform for pots under £250,000. For a higher-rate taxpayer building a long-term ISA, the low-cost LifeStrategy or global index funds minimise drag on returns. The cap means costs stop rising above £250k — unusual for a percentage-fee platform.
AJ Bell offers a broad fund and ETF universe alongside individual shares — ideal for higher-rate taxpayers who want to hold a diversified mix of index funds, investment trusts and income-focused ETFs. The 0.25% fee is reasonable, with the share-dealing cap making it competitive for larger equity positions.
Interactive Investor charges a flat monthly fee regardless of pot size. For a higher-rate taxpayer with an ISA over ~£96,000, the flat £143.88/yr beats Vanguard's 0.15% and most other percentage-fee platforms. With 40,000+ investments including global ETFs, investment trusts and individual equities, it suits sophisticated higher-rate investors.
HL is the UK's largest investment platform by assets and offers the best customer service, broadest fund range and most comprehensive research. For higher-rate taxpayers with complex portfolios or those who value phone support, HL justifies a slightly higher platform fee. The account charge is a maximum of 0.35% a year, billed monthly, and is capped at £45/yr on shares (though not on funds).
InvestEngine charges no platform fee on its DIY ETF ISA — you pay only the underlying ETF costs (typically 0.05–0.20%/yr). For a higher-rate taxpayer who is comfortable choosing a global ETF and leaving it alone, InvestEngine's total cost is close to zero. ETFs only — no individual shares or active funds.
| Platform | £50,000 pot | £100,000 pot | £250,000 pot | £500,000 pot |
|---|---|---|---|---|
| Vanguard | £75/yr | £150/yr | £375/yr | £375/yr (capped) |
| AJ Bell (funds) | £125/yr | £250/yr | £625/yr | £1,125/yr |
| Interactive Investor | £144/yr | £144/yr | £144/yr | £144/yr |
| Hargreaves Lansdown (funds) | £225/yr | £450/yr | £1,125/yr | £2,025/yr |
| InvestEngine (DIY) | £0/yr* | £0/yr* | £0/yr* | £0/yr* |
*InvestEngine DIY platform fee. Underlying ETF ongoing charges (OCF) typically 0.05–0.20%/yr still apply.
Vanguard. Lowest total cost, LifeStrategy fund handles everything, no dealing charges.
Interactive Investor. Flat fee becomes dramatically cheaper at scale — saves thousands vs percentage-fee rivals.
AJ Bell or HL. Access to income-focused investment trusts (City of London, Murray Income) and dividend ETFs not available on Vanguard.
InvestEngine. Zero platform fee for DIY ETF portfolios — total cost at 0.15% ETF OCF is unbeatable.
Both serve different purposes. Pension contributions give you 40% upfront tax relief and reduce your taxable income, which is powerful. An ISA offers completely tax-free withdrawals at any age with no restrictions. The optimal strategy is usually: max pension contributions to stay below the higher-rate threshold (or claim back 40% relief via Self Assessment), then use ISA for accessible long-term wealth. If you can only choose one and are under 40, the pension's 40% relief usually wins.
Dividends: 35.75% tax outside ISA, 0% inside. Capital gains: 24% outside ISA (above £3,000 allowance), 0% inside. Interest: 40% outside ISA above the £500 PSA, 0% inside. On a £100,000 ISA portfolio returning 5% (£5,000/yr), a higher-rate taxpayer could save £1,687+ per year in dividend tax alone.
The ISA allowance is £20,000 per person per tax year (2026/27). You can split this across different ISA types as long as the total does not exceed £20,000. Unused allowance cannot be carried forward to the next tax year.
Vanguard charges £4/month below £32,000, then 0.15% capped at £375/yr. Interactive Investor's Core plan is £5.99/month (£71.88/yr, portfolios to £100,000). Below about £48,000 Vanguard is cheaper; above it the flat fee wins. Above ~£100,000 you move to ii Plus at £14.99/month, and Vanguard's flat fee wins. For a pot over £250,000, II saves £231+/yr vs Vanguard's cap — plus you get access to 40,000+ investments vs Vanguard's in-house funds only.
For a higher-rate taxpayer the ISA wrapper is worth more than it is to a basic-rate taxpayer, because the tax it avoids is charged at a higher rate. That makes the tax saved, not the platform fee, the larger number — but the fee is the part you control. Charges verified 2 September 2026.
The account or platform charge only — the fee the platform levies for holding your money. We compare it because it is the one cost you can control by choosing a provider, it is published, and it compounds.
UKCalc receives no commission, fee or payment from any provider named on this page. Provider links are plain editorial references and carry no tracking. See our editorial policy.
| Platform | Account charge, verified 2 September 2026 | Source |
|---|---|---|
| Vanguard | £4 a month (£48/yr) while your total invested balance is under £32,000; 0.15% a year above that, capped at £375. One account fee across all your Vanguard accounts. | Vanguard: Fees explained |
| AJ Bell | Capped at 0.25% a year. Monthly investing is free; online dealing from £1.50. International dealing and FX capped at 0.75%. | AJ Bell: Charges |
| Hargreaves Lansdown | Account charge is a maximum of 0.35% a year, billed monthly. Share holdings are capped separately. | Hargreaves Lansdown: Charges |
| Interactive Investor | Flat monthly plans: Core £5.99 (portfolios up to £100,000), Plus £14.99, Premium £39.99. Dealing £9.99 (Core) or £7.99 (Plus). | Interactive Investor: Our charges |
| InvestEngine | £0 platform fee on the DIY service; commission-free dealing and no FX charge. Managed portfolios are charged separately. ETFs only. | InvestEngine: Costs |
| PensionBee | 0.50%–0.95% a year below £100,000 depending on plan (Tracker 0.50%, 4Plus 0.85%, Shariah 0.95%), tapering above £100,000. | PensionBee: Fees |
| Pot size | Vanguard | AJ Bell | Hargreaves Lansdown | Interactive Investor | InvestEngine (DIY) |
|---|---|---|---|---|---|
| £5,000 | £48 | £12 | £18 | £72 Core | £0 |
| £10,000 | £48 | £25 | £35 | £72 Core | £0 |
| £25,000 | £48 | £62 | £88 | £72 Core | £0 |
| £50,000 | £75 | £125 | £175 | £72 Core | £0 |
| £100,000 | £150 | £250 | £350 | £72 Core | £0 |
| £250,000 | £375 | £625 | £875 | £180 Plus | £0 |
What the arithmetic shows. Below about £19,200 AJ Bell's 0.25% costs less than Vanguard, because Vanguard charges a £4 monthly minimum under £32,000. Vanguard is cheapest from roughly £19,200 to £47,900, after which Interactive Investor's flat Core plan wins; above £100,000 the Plus plan overtakes Vanguard at about £119,900.
Editorial judgement, stated as such: on these figures the tax saved by using the allowance in full is normally larger than any realistic difference in platform charge. Choosing a provider matters; choosing to use the allowance matters more.