ISA Market Update: 2025 vs. 2026

The 2024/2025 tax year was a landmark period for UK savers. Not only did interest rates sit at recent peaks, but sweeping rule changes finally allowed investors to open and fund multiple ISAs of the same type within a single year. Throughout 2025, this newfound flexibility meant savvy savers could actively hop between providers to chase the absolute best rates without breaking HMRC rules.

As we move through the spring of 2026, the landscape has shifted slightly. While the Bank of England has begun to ease base rates, cash ISA yields remain highly competitive—and the tax-free wrapper is more valuable than ever due to frozen tax thresholds pushing more people over their Personal Savings Allowance. Furthermore, following the Autumn 2025 Budget announcement that the Cash ISA allowance for under-65s will be reduced to £12,000 from April 2027.

The end of March and beginning of April usually see a rush of investments into ISAs before the end of the financial year (April 5).

Each year every person in the UK has a £20,000 allowance to invest into ISAs without paying tax on the interest earned and it's a case of "use it or lose it"—the allowance doesn't roll over into the next tax year.

Crucially, the 2025/26 and upcoming 2026/27 tax years are your last chances to put the full £20,000 into a Cash ISA. As announced in the government's Autumn 2025 Budget, from April 2027, the Cash ISA limit will be reduced to £12,000 for anyone under 65, with the remaining £8,000 restricted to Stocks & Shares or Innovative Finance ISAs.

Until then, money can be split however you like between cash and stocks and shares ISAs, and there are a number of different types of cash ISAs on the market too—from easy access to fixed-rate accounts.

Read more: Cash ISAs vs Stocks & Shares ISAs: Which is best?

Even though interest rates have cooled slightly from their recent peaks, they remain competitive enough that many savers are exceeding their Personal Savings Allowance on standard savings accounts. This makes the tax-free wrapper of an ISA more valuable than ever.

ISAs also became more flexible in the 2024/25 year, as for the first time, the restriction on subscribing to only one ISA of each type per year was removed.

This means investors can subscribe to different ISA providers through the year as and when funds or favourable rates became available, so long as the £20,000 limit was not exceeded.

Thinking about a Lifetime ISA? Read more: What is a Lifetime ISA? How it works, best providers and penalties

Here are some of the highest rates identified at the time of writing, to give a sense of the current market:

Rates last checked: 2 July 2026. Rates shown are among the highest identified from a review of UK Cash ISA providers and are not a whole-of-market comparison. Rates and product availability change frequently and availability is subject to provider terms. Always verify current terms directly with the provider before applying. All accounts listed are FSCS protected up to £120,000.

Read more:

• Cash ISAs vs Stocks & Shares ISAs: Which is best?

• What is a Lifetime ISA? How it works, best providers and penalties

• Martin Lewis reveals hack to avoid paying tax on savings interest as HMRC to rake in £10.4bn