A UK Individual Savings Account shelters eligible cash or investments from UK income and capital gains tax, subject to annual limits and product rules.
An Individual Savings Account (ISA) is a UK tax-advantaged account that can hold eligible cash or investments. Interest, investment income, and capital gains arising inside a valid ISA are generally free from UK income tax and capital gains tax, but the wrapper does not protect against investment loss, fees, inflation, or product restrictions.
£20,000.The account holder subscribes cash to an ISA managed by an HMRC-approved provider. That provider holds cash, investments, or both under the rules for the relevant ISA type. New subscriptions use the allowance for the tax year, which runs from 6 April to 5 April.
The tax benefit applies to income and gains generated inside the wrapper. Contributions do not ordinarily receive an income-tax deduction. Money already accumulated in an ISA can remain sheltered after the tax year ends, even if the holder makes no new subscription.
An ISA is individual rather than joint. Each eligible person has their own allowance and remains responsible for keeping total subscriptions across providers within the applicable limits.
| ISA type | What it can hold | Main risk or restriction |
|---|---|---|
| Cash ISA | Eligible bank, building-society, and certain National Savings and Investments cash products | Inflation, variable rates, withdrawal restrictions, and provider-specific deposit protection |
| Stocks and Shares ISA | Eligible shares, funds, government bonds, corporate bonds, and other permitted investments | Market loss, investment fees, concentration, and liquidity risk |
| Innovative Finance ISA | Eligible peer-to-peer loans and certain other permitted finance investments | Borrower default, platform failure, illiquidity, and limited exit options |
| Lifetime ISA | Cash or eligible investments for a qualifying first-home purchase or later-life access | Eligibility rules and a withdrawal charge for most non-qualifying withdrawals |
A Junior ISA is a separate account for an eligible child. Its allowance, control, and access rules differ from those of an adult ISA.
For the 2026 to 2027 tax year, an eligible adult can subscribe up to £20,000 in total across adult ISAs. The allowance is shared; opening several accounts does not multiply it.
Within that total, payments to a Lifetime ISA are capped at £4,000 for the tax year and count toward the overall allowance. Current GOV.UK guidance permits subscriptions to multiple cash, stocks and shares, or innovative finance ISAs of the same type. A person can generally pay into only one Lifetime ISA during the tax year.
Annual limits and eligibility rules can change. Check the tax year and current GOV.UK guidance rather than relying on a figure from an old statement or article.
Assume an eligible investor makes these subscriptions during the 2026 to 2027 tax year:
| Subscription | Amount |
|---|---|
| Cash ISA with Provider A | £8,000 |
| Cash ISA with Provider B | £2,000 |
| Stocks and shares ISA | £6,000 |
| Lifetime ISA | £4,000 |
| Total subscriptions | £20,000 |
The two cash ISA subscriptions are permitted under the post-April 2024 multiple-account rules, and the £4,000 Lifetime ISA payment sits inside the £20,000 overall allowance. The investor has no ordinary adult ISA allowance left for that tax year.
If the stocks and shares ISA later rises from £6,000 to £7,200, the £1,200 gain does not use more subscription allowance. If it falls to £4,500, the loss does not restore allowance. The allowance measures subscriptions, not market value.
Most adult ISAs permit withdrawals, but the product can still impose notice periods, fixed-term penalties, dealing time, or exit fees. Lifetime ISAs have separate withdrawal rules and may apply a government withdrawal charge unless an exception applies.
The key allowance question is whether the ISA is flexible:
For example, suppose a person subscribes £10,000 and then withdraws £3,000. Under current GOV.UK guidance, the person could generally put up to £13,000 back into the same flexible ISA during that tax year, compared with £10,000 of remaining allowance if the account were not flexible. Confirm flexibility before acting; the word “ISA” alone does not establish replacement rights.
An ISA transfer moves existing ISA value through providers without treating the transferred amount as a fresh ordinary subscription. The receiving provider should initiate the formal transfer process.
Do not assume that withdrawing money and paying it into a new provider has the same effect. A manual withdrawal takes assets outside the ISA wrapper, and a later deposit can count as a new subscription. That can matter when the current-year allowance is already partly or fully used.
Before transferring, check:
Start with the purpose of the money and the risk of the underlying holding, not the tax label.
Compare the interest rate, whether it is fixed or variable, access restrictions, penalties, minimum balance, and the provider’s regulatory status. A tax-free rate can still be less competitive than a taxable account after considering a person’s available savings allowances and circumstances.
Review asset allocation, diversification, dealing costs, platform charges, fund expenses, currency exposure, and the time horizon. The ISA wrapper does not make a volatile or concentrated investment safe.
Assess borrower credit quality, platform controls, diversification, expected defaults, recovery arrangements, and the ability to exit. Tax-free interest does not compensate automatically for credit risk or liquidity risk.
Confirm age eligibility, the intended use, the first-home conditions, the interaction with workplace pensions, and the effect of the withdrawal charge. A government bonus should not be assessed without the access restrictions.
ISAs began on 6 April 1999, replacing Personal Equity Plans and Tax-Exempt Special Savings Accounts (TESSAs). TESSAs were fixed-term UK savings accounts intended to shelter eligible interest, while PEPs were investment-oriented plans. These are now historical predecessors, not current choices for a new saver.
The history matters because an old statement, archived product name, or transferred balance may refer to a TESSA, PEP, mini ISA, or maxi ISA. Those labels should be interpreted in their period-specific context rather than as current ISA categories. For present-day decisions, identify the account’s current legal wrapper and provider terms.
£20,000 allowance.This page provides general UK financial and tax education, not individualized tax, legal, banking, or investment advice. Current legislation, GOV.UK guidance, and provider terms control a specific account.