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Our best rates | Eligibility | Withdrawals | Open a Fixed Rate ISA | FAQs
If you are looking for a reliable way to grow your money with tax-free interest, our Fixed Rate Cash ISAs give you certainty and peace of mind.
The Cambridge’s Fixed Rate ISAs are designed for savers who value stability and the reassurance of a trusted building society. Your interest rate is locked in for the full period – that means no surprises and no exposure to changes in the wider savings market.
Whether you are saving for the short or medium term, a Fixed Term Cash ISA can help you plan confidently for the future.
Our best Fixed Rate ISA rates
We offer a range of Fixed Rate Cash ISAs so you can match your savings to your goals. Review interest rates and learn more about each below.
| 1 Year Fixed Rate ISA | 18 Month Fixed Rate ISA | 2 Year Fixed Rate ISA |
| 1-year term | 18-month term | 2-year term |
| 3.75% Tax-free p.a./AER% | 3.80% Tax-free p.a./AER% | 3.70% Tax-free p.a./AER% |
| Minimum deposit £500 | Minimum deposit £500 | Minimum deposit £500 |
| Find out more | Find out more | Find out more |
If you are struggling to review your options and need help determining which Cash ISA is best for you, talk to one of our expert savings team. Simply get in touch today.
Simple, secure and tax‑free savings
With all Cash ISAs, any interest paid on your savings is completely tax-free, meaning you won't pay UK income tax or capital gains tax on the interest you earn.*
This differs from standard fixed rate savings accounts, where any interest you earn may be subject to tax.
A Fixed Rate Cash ISA (sometimes called a Fixed Term Cash ISA) offers additional certainty, as your interest rate is fixed until maturity and will not rise or fall with changes in the wider savings market. Because you always know exactly what your savings will earn, a Fixed Rate ISA is ideal if you prefer certainty and predictable returns over variable savings options.
Your savings are protected, your interest rate is guaranteed for the term of the product, even if markets move.
* Tax treatment depends on your individual circumstances and may change. If you live outside the UK, you may need to declare your ISA interest in your country of residence.
Your eligibility
To open a Cash ISA, you'll need to meet the government's ISA eligibility rules. These apply to all Cash ISAs, including Fixed Rate Cash ISAs.
In the UK, Fixed Rate Cash ISAs are available if you:
- Are a UK resident for tax purposes
- Are aged 18 or over
- Stay within your annual ISA allowance
Once you open a Cash ISA, including a Fixed Rate ISA, this counts towards your annual ISA allowance. This is a limit set by the government on how much you can save across all types of ISAs in a single tax year.
Withdrawals and penalties
You can withdraw money from your Fixed Rate Cash ISA before the end of the fixed term, but an interest penalty fee will apply.
The interest penalty fee is calculated by deducting a set number of days interest on the amount you withdraw.
The interest penalty fee depends on the length of the fixed term:
- 1 Year Fixed Rate ISA: 120 days’ interest
- 18 Month Fixed Rate ISA: 150 days’ interest
- 2 Year Fixed Rate ISA: 180 days’ interest
What would the penalty be for a 1 Year Fixed Rate ISA with a withdrawal amount of £10,000?
The following projection assumes the account is opened on 1st January and no further deposits or withdrawals are made. Projections are for illustrative purposes only and do not take into account individual circumstances.
| Withdrawal amount | Tax-free p.a. / AER % | Projected tax-free interest after 1 year | Early access interest penalty | Remaining interest paid to you |
| £10,000 | 3.75% | £375 | 120 days / £123.29 | £251.71 |
Making a withdrawal
You can make withdrawals from your Fixed Rate Cash ISA in one of the following ways:
In branch - visit one of our branches with your passbook.
• Up to £500 in cash over the counter
• Up to £250,000 by cheque
Transfer to your nominated bank account – this can be arranged:
• in branch
• by telephone
• online via secure message
For larger withdrawals - please contact us in advance. We'll discuss the available payment options and whether any notice is required.
Why open a Fixed Rate Cash ISA with us
When you open a Fixed Rate Cash ISA with The Cambridge, you not only benefit from tax-free savings and an interest rate that’s fixed for a set period, but also:
- A minimum opening deposit of just £500 – making our ISAs available to all savers, whether you are just starting your savings journey or investing a larger sum.
- Support from a trusted building society – we have a long history of supporting savers like you, so you can feel confident that your money is being looked after by a provider that puts members first.
- Personal service when you need it – as well as being able to manage your accounts through our app and online, you can also find support in store or by phone. Our friendly team is on hand to help.
How to open and manage a Fixed Rate Cash ISA with The Cambridge
Opening your account
Opening a Fixed Rate Cash ISA with The Cambridge is straightforward. You can open your account:
- In store
- By phone
- By post
The minimum amount required to open an account is £500.
When you open your Fixed Rate Cash ISA, you can invest all or part of your annual ISA allowance, currently £20,000 for the 2025/2026 tax year, as a single deposit. No additional deposits can be made after the account has been opened.
Managing your account
You can manage your Fixed Rate Cash ISA online, via the Cambridge Money App, in store, by phone or by post.
If you are acting under Power of Attorney, you can manage the account in store, by phone or by post.
You may also request to transfer an existing ISA into your Fixed Rate Cash ISA within 30 days of opening, subject to product terms and conditions.
Frequently Asked Questions
Let’s talk about savings
Everyone’s savings journey is different. Whether you are comparing Fixed Rate ISAs or deciding between ISAs and alternative savings accounts, we are here to help.
Pop into your local branch or call us on 0345 601 3344 for a friendly, no-pressure chat about how to make the most of your money.
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