Fixed vs variable interest rates on your savings - what's the difference?

3 minute read

Illustration of Coventry
Illustration of Coventry

Fixed vs variable interest rates on your savings - what's the difference? 

3 minute read

When you open a savings account, one of the most important things to look at is the interest rate. In simple terms, this is the amount your bank or building society will pay you for saving with them.

 

To give you an idea of what this means… Let’s say you have an account with £100 in it. An annual interest rate of 1% will pay you £1 interest, and an annual interest rate of 2% would get you £2 paid in interest.

 

Other factors, like your account-specific terms and conditions can guide your interest rate. But it’s also good to know the difference between fixed interest rates and variable interest rates. This could help you make better decisions about where to save. 

What is a fixed interest rate?

fixed interest rate means your rate will stay the same for a set period of time.

 

For example, if an account has a fixed rate of 3% for one year, you’ll earn 3% interest for that whole year. No matter what happens, the rate won’t change.

 

Pros of fixed rates

  • Stability: You know exactly how much interest you’ll earn.
  • Guarantee: No matter what happens your rate will stay the same.
  • Good for planning: Your earnings are predictable. You know where you’ll be when your rate ends. 
  • Encourage discipline: With some fixed rates, you’re not able to take your money out. This can remove the temptation to dip into your savings.

Cons of fixed rates

  • No increase: If market rates go up, yours will stay the same.
  • Limited flexibility: You may be locked into an account with limited or no access until your account matures.
  • You can’t change your mind: After the cooling-off period, often you can’t switch to another account. This means you should be sure you want to go ahead when you’re choosing a fixed account.
Illustration of a calculator

What is a variable interest rate?

With a variable interest rate, your bank or building society can change your rate at any time. This could be because of changes to the Bank of England base rate, inflation or market conditions.

 

For example, when you open a savings account, it might have a 2% interest rate. But your provider could decide to change this up to 2.5% or down to 1.5% at any time. 

 

Pros of variable rates

  • Your rate could go up: So, you could earn more interest than you expected.
  • Flexibility: Variable accounts often let you access your money more than fixed accounts.
  • Easy to switch: You can often close these accounts with limited or no charges.
Illustration of a calculator

Cons of variable rates

  • Uncertainty: As well as going up, your rate could go down. You’ll be told before this happens, but it means you can’t be sure of how much interest you’ll earn.
  • Reduced rate: Traditionally, rates in these accounts are lower than a similar fixed rate account. But in recent years, some variable rate accounts have been competitive. It’s always worth comparing accounts. 

Other interest elements to think about

How is your interest paid – compounded or paid away?

  • Compounded – This means it’ll be paid into the same account on your interest payment date.

For example, let’s say your rate is 1% and your interest payment date is 1 January. On this date, if you had £1,000 in your account for a year, your £10 interest would be paid directly in to your account. This means your account balance would change to £1,010.

  • Paid away – This means it’ll be paid into another account on your interest payment date. This is usually an account in your name and is sometimes called your ‘named account.’

For example, let’s use the same scenario as above. If you had £1,000 in your account on your interest payment date, your balance wouldn’t change. However, your £10 interest would be paid into your named account. 

 

When is your interest paid – monthly or annually?

  • Annually – You get your interest once a year as a total sum. This can be on a set date or the anniversary of your account opening.
  • Monthly – You’ll get multiple, smaller interest payments spread over the year. This usually paid on the last day of the month, and depending on the account, you may be able to access the interest monthly. 

So how should you have your interest paid?

It’s up to you! There’s no one size fits all answer. It’ll depend on how you want your savings to work for you.

 

You may decide you don’t want to just choose one option. A combination of fixed and variable savings accounts might work best with your goals.

What about your Personal Savings Allowance (PSA)?

Your PSA is certainly something that you should keep in mind when considering your interest payments and the amount you could receive. Have a read of our recent PSA article to get all the details. 

Need some help? 

You might have a question or want support understanding the interest on an account you have with us, Call us on 0800 121 8899, Monday to Friday 8am-7pm and Saturday 9am-2pm. We’re happy to help.

 

Published September 2025

 

Related articles:

Illustration of a couple chatting at a coffee table

What's next for interest rates?

 

Discover more on how to deal with changes to interest rates.

Related articles:

Illustration of a couple sat at a coffee table

What's next for interest rates? 

 

Discover more on how to deal with changes to interest rates.

Illustration of a woman sat at a table looking at a latop

Related articles:

Illustration of a couple chatting at a coffee table

What's next for interest rates?

 

Discover more on how to deal with changes to interest rates.

Manage your cookies

We use three types of cookies to improve your experience. You can choose which optional cookies you’d like to allow below. We’ll save your preferences and apply them when you visit our site in the future. You can find out more in our Cookie Policy.

Essential cookies

Essential cookies are necessary for our website to work. They keep you secure, make sure pages load properly and enable basic features like navigation. These can’t be turned off.
Always active

Performance / analytics cookies

Performance cookies help us understand how you use our website, so we can make it better. They only collect anonymous data, like how long you spend on a page.

Advertising cookies

Advertising cookies help to show you ads that match your interests. They’re managed by trusted third parties so you should only see things that are relevant to you.