Best Cash ISA UK 2026: Top Rates & Providers
Key facts (2026): The cash ISA allowance is £20,000 per year in 2026. Top easy access cash ISA rates are 4.3–4.8% AER from providers including Trading 212, Plum, and Chip. Fixed rate cash ISAs offer up to 4.7% for one year. All interest earned in an ISA is tax-free, with no limit on the amount of tax-free interest over time.
A cash ISA is a savings account where the interest is completely tax-free. Unlike a regular savings account where interest counts toward your personal savings allowance (£1,000 for basic rate taxpayers), ISA interest is outside the tax system entirely — making it particularly valuable for higher rate taxpayers or those with larger savings balances.
Cash ISA Allowance and Tax Benefits 2026
You can deposit up to £20,000 into ISAs per tax year (6 April to 5 April). Once money is in an ISA, any interest earned is tax-free permanently — the balance is not subject to income tax regardless of size. This makes cash ISAs an excellent long-term savings vehicle — the tax-free benefit compounds over time as your ISA balance grows. ISA balances can be passed to a spouse or civil partner on death without losing ISA status (APS — Additional Permitted Subscription).
Best Cash ISA Rates 2026
Easy access cash ISAs: Trading 212 Cash ISA (4.7% AER), Plum (4.6% AER), Chip (4.5% AER). Fixed rate cash ISAs (1 year): Shawbrook Bank (4.8% AER), Paragon Bank (4.7% AER). These rates change frequently — always check current rates at comparison sites like MoneySavingExpert, MoneySupermarket, or Savings Champion before applying.
How to Transfer Your Cash ISA
You can transfer your existing ISA to a new provider to get a better rate without losing the tax-free status. Request a transfer form from the new provider — never withdraw the money yourself as this loses the ISA wrapper. Transfers must be completed within 15 working days. You can transfer from cash ISA to stocks and shares ISA and vice versa. Transferring a fixed ISA before maturity may incur a penalty.
Our Verdict
Cash ISAs are most valuable for higher rate taxpayers and those who have exhausted their personal savings allowance. For basic rate taxpayers with modest savings, the personal savings allowance (£1,000) may mean a higher-rate regular savings account beats a lower-rate ISA. However, building ISA savings early — while rates are attractive — is sound financial planning given that PSA could be reduced in future budgets.
Frequently Asked Questions
What is the best cash ISA rate UK 2026?
Top easy access cash ISAs pay approximately 4.5–4.7% AER. Fixed rate cash ISAs (1 year) offer up to 4.8% AER. Always check current rates as they change frequently.
What is the ISA allowance 2026?
£20,000 per tax year, which can be split across cash ISA, stocks and shares ISA, innovative finance ISA, and Lifetime ISA (£4,000 limit within the £20,000 total).
Should I get a cash ISA or regular savings account?
For higher rate taxpayers or those with large savings, the cash ISA tax-free benefit is significant. For basic rate taxpayers with savings under £20,000, compare rates carefully as a regular account may pay more after using the personal savings allowance.
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Disclaimer: For informational purposes only. Always verify with official sources such as gov.uk or qualified professionals before making decisions.
Last updated: April 2026 · Author: Chandraketu Tripathi
