Locking in Growth: Your Guide to the Best 5-Year Fixed-Rate ISAs

When it comes to building a robust savings strategy, striking the right balance between growth and security is everything. If you have a lump sum of money that you won’t need to touch for the medium-to-long term, a 5-year fixed-rate Cash ISA can be a powerful tool in your financial arsenal.

By locking in your rate today, you protect your hard-earned interest from the taxman while shielding yourself against potential drops in the wider interest rate market.

What is a 5-Year Fixed-Rate Cash ISA?

A Cash ISA (Individual Savings Account) allows you to save money without paying any income tax on the interest you earn. With a fixed-rate version, you agree to lock your funds away for a set period—in this case, 60 months—in exchange for a guaranteed interest rate that cannot change until the term ends.

Top-Performing 5-Year Fixed ISAs

The 5-year fixed ISA market features competitive headline rates from both specialist banks and established high-street names. Leading options include:

| Provider | Interest Rate (AER) | Minimum Deposit | Interest Payment Options | Early Withdrawal Penalty |
| :— | :— | :— | :— | :— |
| Shawbrook Bank | 5.25% | £1,000 | Monthly, annually, or at maturity | Loss of 360 days’ interest |
| Aldermore | 5.25% | £1,000 | Monthly, annually, or at maturity | Product-specific penalties apply |
| UBL UK | 5.25% | £2,000 | Monthly, quarterly, annually, or at maturity | Loss of 365 days’ interest (full withdrawal only) |
| Nationwide Building Society | 5.00% | £1 | At maturity | Loss of 300 days’ interest |