Start investing tax-free with as little as £1 — Vanguard · Moneybox · Nutmeg · Trading 212 · InvestEngine compared
An ISA (Individual Savings Account) lets you invest or save up to £20,000 per year completely free of income tax and capital gains tax. For beginners, the key decision is which type of ISA and which platform to start with. This guide cuts through the jargon.
Cash ISA vs Stocks & Shares ISA — which first?
Feature
Cash ISA
Stocks & Shares ISA
Returns
Interest rate (4–5% in 2026)
Investment growth (historically ~7%/yr long-term)
Risk
None — capital protected
Value can fall as well as rise
Time horizon
Any — good for 1–3 years
5+ years recommended
Tax
Interest always tax-free
Growth and income always tax-free
Best for
Emergency fund, short-term goals
Retirement, house deposit (10yr+), long-term wealth
The beginner rule of thumb: If you need the money within 3 years, use a Cash ISA (or savings account). If you won't need it for 5+ years, a Stocks & Shares ISA will almost certainly outperform a Cash ISA over that timeframe. Many people keep both.
How to open your first ISA — 4 steps
Choose your goal and time horizon. Short-term (1–3 years) → Cash ISA. Long-term (5+ years) → Stocks & Shares ISA. Both → open one of each (separate accounts, same £20,000 total allowance split between them).
Pick a platform from our recommendations below. All are FCA-regulated with FSCS protection.
Choose a fund. As a beginner, a single global index fund or a LifeStrategy fund is all you need. Don't pick individual stocks.
Set up a monthly direct debit. Even £50/mo into a Stocks & Shares ISA compounds significantly over 20–30 years. Consistency beats timing.
Best platforms for beginner investors
VanguardBest overall for beginners
Platform fee 0.15% (max £375/yr)
Min investment £100 lump / £100/mo
Best fund LifeStrategy 80% Equity
Vanguard is the beginner's default for good reason: its platform is simple, its funds are among the cheapest in the world, and its LifeStrategy range (20%, 40%, 60%, 80% and 100% equity) makes choosing a fund a one-decision process. The 0.15% platform fee is among the lowest available.
Pros
Lowest platform fee for smaller pots (0.15%, cap £375)
LifeStrategy funds: one fund covers everything
Simple interface designed for long-term investors
Highly trusted brand — world's largest fund manager
Cons
Only Vanguard funds available (no third-party funds)
£100 minimum investment is higher than some rivals
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MoneyboxBest for first-time savers
Platform fee 0.45% (plus fund charges ~0.12–0.45%)
Min investment £1
Best for Beginners building the saving habit
Moneybox's round-up feature makes saving effortless: it rounds up every card purchase to the nearest pound and invests the difference. Alongside the Stocks & Shares ISA, it also offers a Cash ISA, Lifetime ISA and Junior ISA — useful if you want multiple ISA types in one app.
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InvestEngineZero platform fee (DIY)
Platform fee 0% (DIY) / 0.25% (managed)
Min investment £100
Best for ETF investors who want zero cost
InvestEngine charges no platform fee whatsoever on its DIY ETF ISA — you only pay the underlying fund charges (typically 0.07–0.25%). For a beginner investing in a simple global ETF and happy to choose their own fund, this is the cheapest option on the market.
Pros
Zero platform fee on DIY ISA
Huge range of ETFs (500+)
Managed portfolios available if you don't want to choose
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NutmegBest managed portfolio
Platform fee 0.25–0.75% (depending on portfolio)
Min investment £100 (ISA)
Best for Hands-off beginners
Nutmeg manages your investments for you based on your chosen risk level (1–10). You don't need to pick funds or rebalance — Nutmeg does it all. Backed by JP Morgan, it's the most popular robo-advisor in the UK and ideal for true beginners who want to do nothing beyond choosing a risk level.
Pros
Fully managed — pick risk level, do nothing else
JP Morgan backing
Socially responsible portfolios available
Pots for specific goals (house, retirement, etc.)
Cons
Higher fees than DIY platforms
No ability to choose your own funds
Returns may lag simple passive index funds over time
For money you won't need for at least 5 years, a Stocks and Shares ISA will almost always outperform a Cash ISA over the long run. For money you might need within 1–3 years, a Cash ISA is safer. Many beginners open both — a Cash ISA for the emergency fund and short-term goals, a Stocks and Shares ISA for long-term wealth building.
Most ISA platforms let you start with as little as £1 (Trading 212, Moneybox) or £100 (Vanguard, InvestEngine). There is no minimum to open a Cash ISA at most banks. The annual ISA allowance is £20,000 — you don't need to use it all at once. Start small and build the habit.
In a Cash ISA, your money is protected and cannot go down in value (subject to FSCS £85k limit). In a Stocks and Shares ISA, the value of your investments can fall as well as rise. Over long periods (10+ years) the stock market has historically delivered positive returns, but past performance is not a guarantee of future results. Only invest money you won't need for at least 5 years.
Vanguard's LifeStrategy 80% Equity fund is widely recommended for beginners. It holds thousands of global stocks and bonds in a single fund, automatically rebalances, and charges just 0.22% per year (fund OCF). On Vanguard's platform (0.15% additional fee, capped at £375/yr), total costs are around 0.37%/yr — far less than most managed funds.