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

When it comes to long-term savings, predictability is a powerful asset. In an economic landscape where interest rates fluctuate, a 5-year fixed-rate Cash ISA (Individual Savings Account) offers a unique peace of mind: a guaranteed, tax-free return on your savings locked away for half a decade.

If you have a lump sum you won’t need to touch for the foreseeable future, locking in a multi-year fix can shield your money from market drops. Here is everything you need to know about navigating the 5-year fixed ISA market, what the top providers are offering, and how to decide if a long-term lock is right for you.

Current Landscape: Top 5-Year Fixed ISA Rates

The market for long-term fixed cash ISAs features competitive rates from both challenger banks and established household names. Leading the pack are providers offering returns around the 5.00% to 5.25% AER tax-free mark.

| Provider | Interest Rate (AER) | Minimum Deposit | Key Features / Access |
| :— | :— | :— | :— |
| Shawbrook Bank | 5.25% | £1,000 | Non-flexible; interest paid monthly/annually |
| Aldermore | 5.25% | £1,000 | Monthly, annual, or maturity interest options |
| UBL UK | 5.25% | £2,000 | Strict whole-withdrawal rules apply if breaking early |
| Tandem Bank | 5.13% | £1 | Flexible ISA allowance, low minimum deposit |
| Castle Trust Bank | 5.12% | £1,000 | Online e-Cash ISA, interest paid on maturity |
| Nationwide Building Society | 5.00% | £1 | Big-brand security, interest paid at maturity |