The Financial Services Compensation Scheme (FSCS) guarantees that it will step in to compensate the first £120,000 you have saved with a UK-authorised bank, building society or credit union in the event that the business goes bust.
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How we picked theseCash ISAs are savings accounts that pay interest free of income tax. This means that no matter how much interest you earn on your savings in the account, you’ll never pay any tax on it.
Just like standard savings accounts, there are several types of cash ISAs to choose from. One option is a fixed rate cash ISA, which requires you to tie up your money for a set amount of time. In this guide, we explain how 1-year fixed rate cash ISAs work.
A 1-year fixed rate cash ISA is simply a cash ISA that requires you to lock away your savings for a term of 1 year. In return, you receive a fixed rate of interest that is usually higher than you’d get on an easy access cash ISA.
In many cases, you won’t be able to top up your funds during the term of the account and you won’t usually be able to make withdrawals either – or if you can, you’ll often pay a penalty fee. This will typically be a number of days’ interest. At the end of the term, your account will mature and you can either withdraw your funds or have them transferred to another ISA.
When comparing 1-year fixed rate cash ISAs, it’s important to check the minimum deposit requirement for opening the account. This can vary depending on the provider, and in some cases, it can be a few hundred or a few thousand pounds. Keep in mind that the maximum you can pay into ISAs overall stands at £20,000 for the 2025/2026 tax year. The rules changed on 6 April 2024, so you can now open multiple cash ISA per tax year, rather than just 1, as was the case previously.
If, when you open your new cash ISA, you want to transfer in funds from another cash ISA with another provider, it’s important to check whether your new cash ISA permits this – not all cash ISAs allow transfers in, though many do. Transfers do not count towards the current year’s ISA allowance.
Thanks to the personal savings allowance, all basic rate taxpayers can now earn up to £1,000 a year tax-free on any interest from savings and current accounts. Higher rate taxpayers can earn up to £500, while additional rate taxpayers have no personal savings allowance.
As a result, if you’re a basic or higher rate taxpayer, you might be wondering whether putting money in a tax-efficient cash ISA is worth it. However, it’s important to keep in mind that interest rates have risen in recent years, which means those with a decent amount in their savings pot could be closer to reaching their personal savings allowance limit. By contrast, saving your money in a cash ISA will ensure that you never get charged tax on your savings, no matter how much interest you earn.
Ultimately, you might decide you want to keep some of your savings in a standard account and some in a cash ISA.
How you open a cash ISA will depend on the provider. You might be able to do this in branch, online, via the provider’s app, by post or over the phone. You will usually need to fill in a short application form and provide a few personal details. You will also need to state whether you want to transfer in funds from another cash ISA elsewhere.
Unless you’re already a customer with that particular bank/building society, you will usually need to provide proof of ID, such as a passport or driving licence, and proof of address, such as a utility bill, council tax bill or bank statement.
Our best fixed-rate cash ISAs are the highest interest rates available. To get the latest rates, we use Defaqto data, which covers nearly the full market of savings products and is checked and updated daily. We don’t include accounts from private banks.
All the cash ISAs in our list have savings protection – for most, this is the Financial Services Compensation Scheme (FSCS). Other schemes include that of NS&I, which is 100% backed by HM Treasury, and the Gibraltar Deposit Guarantee Scheme.
| Rates up to | 4.3% AER |
|---|---|
| Number of accounts | 106 |
| Minimum investment | £1 |
| Maximum investment | £9,000,000 |
| Opening options | Branch, website, mobile app, post, telephone |
Opening a 1-year fixed rate cash ISA can be a great option if you’d like to lock away a lump sum of cash for a short amount of time in return for a higher interest rate. It can be a sensible choice if interest rates are rising as locking your money away for a longer period could result in you being stuck with an account that later becomes uncompetitive.
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