Comparison: Savings

Best UK Cash ISA 2026

Last reviewed May 2026

A Cash ISA pays interest tax-free, regardless of how big the balance gets. For anyone holding a meaningful emergency fund or saving toward a near-term goal, a Cash ISA almost always beats an ordinary savings account once you cross the Personal Savings Allowance (£500 a year of interest for higher-rate taxpayers, £1,000 for basic rate). We rank the main UK Cash ISA options across three formats: easy access (best for emergency funds), fixed-rate (best for money you can lock away), and app-based (best if you value the UX over rate-chasing). Rates change constantly. Always check the provider site before applying.

Our pick

Trading 212

For an emergency fund or any savings you might need on short notice, Trading 212's flexible Cash ISA hits the trifecta: a top-tier rate, instant access, and the flexible-ISA feature so you can withdraw and replace money in the same tax year without it counting against your allowance. Caveat: your money is held by partner banks rather than Trading 212 directly, so check the current banking partners and stay below £85k per partner. For balances above £85k or if you prefer a single regulated bank, Cynergy Bank covers the same use case with direct FSCS protection.

Visit Trading 212 →

Honourable mentions

Atom Bank (1-Year Fixed)

For money you genuinely will not touch for 12+ months, locking in a fixed rate beats variable rates over the term. Worth pairing a fixed-rate Cash ISA for medium-term goals with an easy-access one for the emergency fund.

Visit Atom Bank (1-Year Fixed) →

Chip

If you are an app-first saver who likes behavioural features (round-ups, savings goals, auto-save), Chip pairs a competitive rate with a polished UX.

Visit Chip →

How we picked

Rates and structural features verified May 2026. Rate values fluctuate with the Bank of England base rate; we publish a representative 2025/26 figure and lean on structural features (FSCS coverage, withdrawal restrictions, flexibility) for the editorial comparison rather than chasing the top of best-buy tables.

Frequently asked questions

What is the best Cash ISA in the UK right now?
For most savers, an easy-access flexible Cash ISA from Trading 212, Chip, or Cynergy Bank is the right starting point. Rates change constantly, so the specific top-rate provider rotates. Pick a provider whose structural features (flexibility, FSCS, app quality) you trust, then accept that the rate will sometimes be marginally beaten by a rival.
Are Cash ISAs worth it for basic-rate taxpayers?
It depends on the balance. Basic-rate taxpayers have a £1,000 Personal Savings Allowance. At a 4.5% rate that is roughly £22,000 of savings before any interest gets taxed. Below that level, an ordinary savings account paying the same rate is just as good (and you keep the ISA allowance for stocks and shares investing, which compounds far more over decades). Above £22,000, the Cash ISA wins. For higher-rate taxpayers the threshold drops to about £11,000 because the allowance is only £500.
Easy access vs fixed-rate Cash ISA?
Easy access for any money you might need on short notice, including your emergency fund. Fixed-rate for money with a defined timeline (house deposit in 18 months, wedding in 2 years). Splitting savings across both is fine and uses the same £20,000 ISA allowance.
Can I transfer an existing Cash ISA?
Yes, and you should. Use the receiving provider's ISA transfer form rather than withdrawing and re-depositing - that way the money stays inside the ISA wrapper and does not count against your annual allowance. Most transfers complete within 15 working days. Some fixed-rate providers charge an exit fee if you transfer out before the term ends; check the small print. If you have several legacy ISAs, see our consolidate ISAs UK guide for the order to do it in.
What does FSCS protection actually cover?
FSCS protects up to £85,000 per person per banking institution. If the bank fails, the FSCS pays out the protected amount within seven working days. Watch for shared banking licences: some app-based providers route deposits through partner banks, and the £85k limit is per partner not per app. If you have £150k in cash savings and care about protection, split across multiple banking groups.

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