Locking in Growth: Your Complete Guide to the Best 5-Year Fixed Rate Cash ISAs
When you are planning for the medium-to-long term, finding ways to make your money work harder without taking on unnecessary stock market risk is a top priority. For savers looking to lock in a guaranteed return while shielding their gains from the taxman, a 5-year fixed rate cash Individual Savings Account (ISA) is a powerful financial vehicle.
By committing your funds for half a decade, you can secure competitive top-tier interest rates—insulating yourself against potential future shifts in the wider economic landscape.
What is a 5-Year Fixed Rate Cash ISA?
A 5-year fixed cash ISA is a savings account where your interest rate is locked (fixed) for a period of exactly five years. Because it is an ISA, all the interest you earn is 100% tax-free, meaning you don’t have to worry about the Personal Savings Allowance (PSA).
In exchange for giving you a guaranteed rate, the provider requires you to keep your money untouched for the full five-year term. Making early withdrawals typically triggers a steep penalty—often equivalent to losing several months’ worth of interest.
Top-Performing 5-Year Fixed ISA Rates
The market features strong options from various banks and building societies for savers ready to commit for the long haul:
| Provider | Interest Rate (AER) | Account Type / Access | Minimum Deposit |
| :— | :— | :— | :— |
| Shawbrook | 5.25% Fixed | Non-Flexible (5 Years) | £1,000 |
| Tandem Bank | 5.13% Fixed | Flexible (5 Years) | £1 |
| Castle Trust Bank | 5.12% Fixed | Non-Flexible (5 Years) | £1,000 |
| Close Brothers | 5.12% Fixed | Non-Flexible (5 Years) | £10,000 |
| Nottingham Building Society | 5.00% Fixed | Non-Flexible (5 Years) | £1 |
| Skipton Building Society | 5.00% Fixed | Non-Flexible (5 Years) | £1 |
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