Locking In Growth: Your Guide to the Best 5-Year Fixed Rate ISAs
When you are mapping out your financial goals over the medium-to-long term, finding a balance between safety and solid returns is crucial. If you have a lump sum of money that you won’t need to touch for half a decade, a 5-year fixed-rate Cash ISA can be an attractive tool.
By locking in your rate today, you can protect your savings from future market shifts while enjoying completely tax-free interest.
What Is a 5-Year Fixed Cash ISA?
A 5-year fixed Cash ISA is a savings account where your money is locked away for a strict five-year term. In exchange for giving up immediate access to your funds, the provider guarantees a fixed interest rate (AER) across the entire period.
Because it is an ISA, all the interest you earn is 100% free from UK income tax, meaning you never have to worry about declaring it to HMRC or breaching your Personal Savings Allowance.
Current Market Leaders (Late 2026)
Competition among savings providers has kept rates robust. Top-tier providers are currently offering competitive returns for those willing to commit for the full five years:
| Provider | Product Type | Interest Rate (AER) | Min. Deposit |
| :— | :— | :— | :— |
| Shawbrook Bank | Non-Flexible Fixed ISA | 5.25% | £1,000 |
| Aldermore | Non-Flexible Fixed ISA | 5.25% | £1,000 |
| Tandem Bank | Flexible Fixed ISA | 5.13% | £1 |
| Castle Trust Bank | Non-Flexible e-Cash ISA | 5.12% | £1,000 |
| Close Brothers Savings| Non-Flexible Fixed ISA | 5.12% | £10,000 |
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