The ISA allowance for 2026/27 is £20,000. As of late August 2026 the top easy access cash ISA rates near 4.61 per cent AER come from Trading 212 and Sidekick, while the best fixed rate ISAs near 4.7 to 4.8 per cent come from Al Rayan Bank, Vanquis Bank and Vida Savings. From April 2027 the cash ISA limit falls to £12,000 for savers under 65.
TL;DR · LAST REVIEWED 30 AUGUST 2026
- The 2026/27 ISA allowance is £20,000 across all ISA types (GOV.UK).
- Top easy access cash ISA rates near 4.61 per cent from Trading 212 and Sidekick (Moneyfacts).
- From April 2027 the cash ISA limit falls to £12,000 for under 65s.
Indicative top cash ISA rates by provider, late August 2026
| Provider | Account type | Rate (AER) |
| Trading 212 | Easy access cash ISA | 4.61 per cent |
| Sidekick | Easy access cash ISA | 4.61 per cent |
| Chip | Easy access (transfers) | 4.6 per cent |
| Al Rayan Bank | One year fixed ISA | 4.72 per cent (expected profit rate) |
| Vanquis Bank | One year fixed ISA | 4.71 per cent |
| Vida Savings | Two year fixed ISA | 4.77 per cent |
| The Stafford BS | Notice ISA | 4.10 per cent |
| Moneybox | Lifetime ISA | 4.25 per cent (incl bonus) |
| Monzo | Cash ISA (paid plan) | 3.25 per cent |
Source: Moneyfacts, 28 August 2026
KEY FACTS
- The 2026/27 ISA allowance is £20,000, unchanged (GOV.UK).
- Trading 212 and Sidekick lead easy access at 4.61 per cent AER (Moneyfacts, 28 August 2026).
- Vida Savings leads two year fixed ISAs at 4.77 per cent AER (Moneyfacts).
- The Junior ISA allowance is £9,000 per child per tax year (GOV.UK).
- From April 2027 the cash ISA limit falls to £12,000 for under 65s; over 65s keep £20,000.
ISA allowances and the 2027 change
| Item | Figure | Note |
| Annual ISA allowance 2026/27 | £20,000 | Across all ISA types |
| Junior ISA allowance | £9,000 | Per child per tax year |
| Lifetime ISA annual cap | £4,000 | Counts toward the £20,000 |
| Cash ISA limit from April 2027 | £12,000 | Under 65s; over 65s keep £20,000 |
Source: GOV.UK, 2026
Providers and current rates
The named providers above lead the cash ISA tables as of late August 2026. Trading 212 and Sidekick top easy access at 4.61 per cent AER, with Chip close behind for transfers. On fixed terms, Al Rayan Bank offers 4.72 per cent on a one year ISA as an expected profit rate under its Sharia compliant structure, Vanquis Bank 4.71 per cent, and Vida Savings 4.77 per cent over two years. Moneybox leads the Lifetime ISA at 4.25 per cent including bonus. Rates can change at any time, and easy access rates in particular move most around the April tax year boundary.
The allowance and the 2027 change
Every UK adult has a £20,000 allowance for the 2026/27 tax year, which can go entirely into a cash ISA or be split across cash, stocks and shares and innovative finance ISAs. From 6 April 2027 the cash ISA limit falls to £12,000 for savers under 65, with the remaining £8,000 available only for stocks and shares; savers aged 65 and over keep the full £20,000 in cash. The Junior ISA allowance is £9,000 per child. Unused allowance cannot be carried forward.
Easy access versus fixed
Easy access cash ISAs allow withdrawals at any time but the rate can change whenever the provider chooses. Fixed rate ISAs lock money away, usually for one to five years, for a guaranteed rate, with a penalty for early withdrawal. Some cash ISAs are flexible, meaning money withdrawn and replaced within the same tax year does not use fresh allowance. Cash ISA rates broadly track the Bank of England base rate, which was 3.75 per cent at the end of August 2026.
DISCLAIMER
This article is editorial information, not financial advice. Kael Tripton Ltd is not authorised or regulated by the Financial Conduct Authority. Figures were correct at the last review date shown above; verify current rates and rules with the primary sources listed below before acting.
Frequently asked questions
Who has the best cash ISA rate right now
As of late August 2026 Trading 212 and Sidekick led easy access at 4.61 per cent AER, and Vida Savings led two year fixes at 4.77 per cent, according to Moneyfacts. Rates change frequently.
What is the ISA allowance for 2026/27
The ISA allowance is £20,000, the total across cash, stocks and shares and innovative finance ISAs combined.
Is the cash ISA allowance changing
Yes. From 6 April 2027 the cash ISA limit falls to £12,000 for under 65s, while over 65s keep the full £20,000. The overall ISA allowance stays £20,000.
Can I open more than one ISA in a year
Since the 2024 rule change you can open and pay into multiple ISAs of the same type in one tax year within your allowance. Lifetime ISAs are an exception.
What is the Junior ISA allowance
The Junior ISA allowance is £9,000 per child per tax year, separate from the adult allowance.
SOURCES
- GOV.UK: Individual Savings Accounts – accessed 30 August 2026
- Moneyfacts ISA rates – accessed 30 August 2026
