Cash ISAs: Earn Up To 4.72% Tax-Free in May 2026 Despite Steady Base Rate

UK savers are currently presented with Cash ISA rates reaching as high as 4.72% AER for a two-year fixed term, a figure that stands out given the Bank of England's decision to hold its base rate at 3.75% in April 2026. This offers a compelling avenue for individuals to shield their savings from the taxman, a consideration often overlooked in the pursuit of headline interest rates.

The Monetary Policy Committee's consistent stance on the Bank Rate, maintained at 3.75% since April, provides a degree of stability in the lending landscape. However, the competitive nature of the ISA market means providers are still vying for deposits, pushing rates for tax-efficient savings vehicles upwards.

What's on Offer Right Now?

For those seeking immediate access to their funds, the easy-access Cash ISA market offers rates up to 4.62% AER, with Trading 212 leading the pack for new money. Other notable easy-access options include Moneybox at 4.33% for transfers and Bank of Ireland UK at 4.21%.

However, for savers willing to lock away their capital for a set period, the returns are marginally higher. Secure Trust Bank is currently offering the best two-year fixed ISA rate at 4.72% AER. For a shorter commitment, one-year fixed ISAs are available at up to 4.71% AER, with Moneyfacts reporting a top rate of 4.70% AER. Even three-year fixed ISAs can yield up to 4.65% AER, providing a longer-term, albeit slightly lower, return.

The Tax-Efficient Advantage

The primary benefit of a Cash ISA is its tax-free status. Unlike standard savings accounts, any interest earned within an ISA wrapper is exempt from Income Tax. This becomes particularly pertinent when considering the Personal Savings Allowance (PSA).

Basic rate taxpayers typically have a PSA of £1,000, meaning they can earn up to £1,000 in interest tax-free outside an ISA. Higher rate taxpayers see this allowance halved to £500. Additional rate taxpayers receive no PSA whatsoever. With rates now approaching 5%, it doesn't take a substantial sum to exceed these allowances.

Scenario: Protecting Your Returns

Consider a basic rate taxpayer with £25,000 in savings. At a rate of 4.72% AER, this would generate £1,180 in interest annually. Without an ISA, £180 of this interest would be taxable, costing £36 (20% of £180). Within a Cash ISA, the entire £1,180 remains yours, untouched by tax. For a higher rate taxpayer, the tax bill would be significantly higher, making the ISA wrapper even more critical.

It's also worth noting the Lifetime ISA (LISA) for first-time buyers. While primarily an investment vehicle, it offers a 25% government bonus on contributions up to £4,000 per year, equating to a potential £1,000 annual boost, alongside tax-free growth. This is a distinct offering, but for those saving for a first home, it warrants investigation.

But there are risks

While fixed-rate ISAs offer certainty of return, they come with a trade-off: liquidity. Your money is typically locked away for the chosen term, and early withdrawals can incur penalties, such as loss of interest. Furthermore, if the Bank of England were to significantly increase the base rate during your fixed term, you would miss out on potentially higher rates elsewhere. This is the inherent gamble with locking in a rate.

What this means for you

If you hold significant cash savings, particularly outside of an ISA, now is a crucial time to review your accounts. The current competitive rates, combined with the tax advantages of an ISA, present a clear opportunity to maximise your returns and minimise your tax liability. Consider whether your current savings are earning a competitive rate and if they are adequately protected from tax.

Step-by-step: What to do right now

1. Assess your current savings: Check the interest rates on all your existing cash accounts, both ISA and non-ISA.
2. Calculate your potential tax liability: Estimate how much interest you're earning and if it exceeds your Personal Savings Allowance.
3. Determine your access needs: Decide if you need immediate access to your funds (easy-access ISA) or if you can commit to a fixed term for a potentially higher rate.
4. Compare top rates: Use comparison sites to find the best Cash ISA rates for your chosen term and access requirements.
5. Consider transfers: If you have an existing ISA with a poor rate, investigate transferring it to a new provider offering a better return. Ensure you follow the correct ISA transfer process to maintain its tax-free status.

When effective

These rates are effective as of May 2026. However, savings rates can change rapidly, so it is advisable to act promptly if you find an account that meets your needs.

Where to get help

For personalised advice on your financial situation, it is always recommended to consult an independent financial adviser. They can provide guidance tailored to your specific circumstances and financial goals.

This is not financial advice. Seek independent financial guidance. Interest on standard accounts may be subject to tax above your Personal Savings Allowance.