Stocks & Shares ISA
A tax-free investment wrapper for UK adults. All income and capital gains earned inside are free of UK tax, making it the core investment vehicle for most people.
By Omair SaoLast reviewed — rates for the 2026/27 tax year. See how we check our figures.
How It Works
You open a Stocks & Shares ISA with a platform or broker and invest up to £20,000 per tax year in shares, funds, ETFs, and bonds. All dividends, interest, and capital gains are completely tax-free. You can sell and withdraw at any time.
Tax Treatment
All income and capital gains within the ISA are free of UK income tax and capital gains tax. No need to report on your tax return.
Tax Advantages
- Capital gains are completely free of CGT
- Dividends received tax-free — saves 10.75% to 39.35%
- Interest from bonds held within the ISA is tax-free
- No reporting requirements on Self Assessment
Who Is This Suitable For?
Anyone investing for the medium to long term who wants to shelter returns from tax. Essential for company owners who have extracted dividends.
Worked Example: £20,000 a year for three years with 5% growth
- 1Year one: £20,000 invested in a global fund grows 5% to £21,000.
- 2Year two: you add £20,000 (£41,000) and 5% growth takes it to £43,050.
- 3Year three: another £20,000 gives £63,050, which grows to £66,202.50.
- 4You have paid in £60,000 and hold £6,202.50 of growth; in a taxable account only £3,000 of gains a year would be exempt and dividends above £500 would be taxable.
Result: The saving looks small in year three but compounds: after twenty years the untaxed growth is usually the larger part of the pot.
Illustrative figures using the 2026/27 rules on this page, last checked on 25 September 2026.
Advantages and Drawbacks
Advantages
- Gains are never taxed, so you can rebalance or switch funds without triggering CGT.
- Dividends and fund interest are reinvested in full, and nothing has to be reported to HMRC.
- Money can be withdrawn at any time, unlike a pension.
Drawbacks
- Investments can fall as well as rise, and a loss inside an ISA cannot be set against gains made elsewhere.
- Platform and fund charges apply every year and can erode much of the tax benefit on expensive products.
- From 6 April 2027 interest on cash parked inside a Stocks & Shares ISA is due to attract a flat 22% charge.
- Dividends from overseas shares may still suffer foreign withholding tax that the ISA cannot reclaim.
Notes for Limited Company Owners
Dividends drawn from your own company can be reinvested here, turning already-taxed income into a pot that never needs another tax return entry. Many directors declare dividends in March and fund the ISA on 6 April as soon as the new allowance opens. Shares in your own private company cannot be held in an ISA.
Common Mistakes
- Holding the whole allowance in cash inside the wrapper while waiting for a ‘good time’ to invest.
- Paying into two Stocks & Shares ISAs in the same year without checking the combined total stays within £20,000.
- Moving investments from a GIA into the ISA without checking whether the sale creates a gain above £3,000.
Who Should Avoid It
People who may need the money within about five years, since a market fall at the wrong moment could force a sale at a loss, and anyone without an accessible emergency fund.
Official Sources
The rules on this page come from the following official pages and were checked on 25 September 2026. Read how we check our figures.
Related Calculators
Frequently Asked Questions
Should I use a Stocks & Shares ISA or a pension first?
Generally maximise pension contributions first for the tax relief, then use your ISA allowance. However, ISAs offer more flexibility as you can access money at any time.
What happens if my investments lose value?
You cannot claim tax relief on losses within an ISA. However, you also do not need to pay tax on any gains.
Can I hold overseas shares in a Stocks & Shares ISA?
Yes, most platforms allow overseas shares. However, foreign dividends may be subject to withholding tax in the country of origin.