The essentials
- A stocks and shares ISA shelters investment income and gains from UK tax.
- The overall ISA allowance is £20,000 per tax year for 2026/27.
- From 6 April 2027 the cash ISA limit falls to £12,000 for under-65s; the overall £20,000 limit stays.
This page describes UK rules as published in 2026. Tax treatment depends on your circumstances and rules can change; check GOV.UK or speak to a regulated adviser.
What an ISA is
An Individual Savings Account is not an investment itself but a wrapper around one. Inside a stocks and shares ISA you can hold funds, ETFs, shares and bonds. Dividends, interest and capital gains inside the wrapper are free of UK income tax and capital gains tax, and you don't report them on a tax return.
The allowance
| Rule (2026/27) | Amount |
|---|---|
| Overall ISA allowance per adult | £20,000 |
| Lifetime ISA (counts towards the £20,000) | £4,000 |
| Junior ISA (separate, per child) | £9,000 |
| Cash ISA, from 6 April 2027, under 65 | £12,000 (overall limit unchanged) |
The allowance resets each tax year on 6 April; unused allowance does not carry forward.
Stocks and shares vs cash ISA
- Cash ISA: interest, no investment risk, but returns may lag inflation.
- Stocks and shares ISA: the value can fall, but long-term growth potential is higher. See the stock market for beginners.
Costs to compare
Providers charge platform fees (flat or percentage), dealing charges and fund charges. Over decades these matter more than most people expect; see fees. A cheap wrapper holding an expensive fund is still expensive.
Transfers
To move an ISA to another provider, use the ISA transfer process run by the new provider. Withdrawing the money yourself and paying it in elsewhere can use up new allowance and lose the tax wrapper.
What goes inside
Many long-term investors hold broad, low-cost index funds in their ISA and add dividend payers or specific shares around them. Diversification still matters inside a tax wrapper; see portfolio diversification.
Outside the UK
Other countries have their own versions with different rules, such as IRAs and Roth IRAs in the US and TFSAs in Canada. The idea is the same: a yearly limit in exchange for tax advantages.
Reader questions
Can I lose money in a stocks and shares ISA?
Yes. The wrapper removes UK tax on gains and income; it does not protect against investment losses.
Can I have more than one stocks and shares ISA?
Rules allow paying into more than one ISA of the same type in a tax year, within the overall £20,000 allowance, depending on provider support. Check current GOV.UK guidance.
Do I need to report ISA income on my tax return?
No. Income and gains inside an ISA are tax-free and don't need to be reported.
Sources
- GOV.UK: Individual Savings Accounts
- HM Treasury ISA reform factsheet (2026)