Best Cash ISA Rates for July 2026 — and Why You Should Use Your £20,000 Allowance Before It Shrinks

Cash ISA rates are still comfortably above 4.5% this month, but there's a bigger reason to pay attention this year: from April 2027, the amount you can shelter in a cash ISA is set to shrink.

Where rates stand right now

As of 3 July 2026, the best easy-access cash ISA rate comes from Trading 212, offering 4.63% AER via a 12-month promotional bonus, with Plum's Cash ISA close behind at 4.62% AER. For fixed terms, AlRayan Bank's 1-Year Fixed Rate Cash ISA pays 4.70% AER through Meteor Savings, while Aldermore leads the 3-year fixed table and Hodge Bank the 5-year table, both around 4.66% AER.

Why the allowance is changing

For the 2026/27 tax year, the ISA allowance remains £20,000, which you can split across cash, stocks and shares, and other ISA types as you like. But from April 2027, savers under 65 will only be able to put £12,000 of that allowance into cash ISAs specifically — the rest would need to go into stocks and shares ISAs or other products to use the full £20,000. If you rely heavily on cash savings, this is the last full tax year where you can put the entire allowance into cash.

Checklist: making the most of your ISA allowance now

• Check your current cash ISA rate against today's best-buy tables on Moneyfacts or Which? — many providers quietly drop rates after the initial bonus period ends.
• Use an ISA transfer rather than withdrawing and reopening — withdrawing and redepositing counts against your annual allowance, but a proper transfer doesn't.
• If you want a fixed rate, compare the 1, 3 and 5-year tables separately, since the best provider often differs by term.
• Decide now whether you want to fill your full £20,000 cash allowance this tax year, given the £12,000 cash cap begins in April 2027.
• Remember the personal savings allowance for non-ISA accounts is separate — basic rate taxpayers can earn £1,000 in savings interest tax-free outside an ISA, so a cash ISA isn't always essential if your total savings are modest.

How the UK's ISA compares internationally

The ISA has no exact equivalent elsewhere, but the closest comparison is the US Roth IRA, which also grows tax-free but is designed for retirement and restricts withdrawals before age 59½ without penalty — unlike an ISA, which you can access anytime. Australia doesn't have a direct equivalent for general savings, instead relying on its superannuation system for tax-advantaged saving, which is even more retirement-locked than either the ISA or the Roth IRA.

Key Numbers

• 4.70% AER — top 1-year fixed cash ISA rate from AlRayan Bank
• 4.63% AER — top easy-access cash ISA rate from Trading 212
• £20,000 — total ISA allowance for 2026/27
• £12,000 — cash ISA cap for under-65s from April 2027

Sources

• MoneySavingExpert: Best cash ISAs
• Moneyfacts: Highest Fixed ISA Rates
• Which?: Best cash ISA rates 2026
• GOV.UK: Transferring your ISA

Educational content only — not financial advice.