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About Us
Established in Newport in 1869 to help local people build homes, we now help people across Wales and England buy properties and save for their future.
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Easy, Flexible Instant Access Savings Account 

Looking for an instant access saver you can top up and dip into when you need to? 

Open and manage online, on our app, in branch or via an agency, with unlimited withdrawals and no notice (provided you keep the minimum balance). FSCS protection covers eligible deposits up to £120,000 per person.


Issue 5


Interest Rate AER / Gross - Variable : 2.45% - 2.70%

Minimum - Maximum Balance : £1 to £2,000,000

Open and manage your account : Online, in Branch or Agency or via the App

You must be:

  • At least 16 years old.
  • A UK resident (excluding Northern Ireland).

May be suitable for you if: 

green_tick You would like the ability to have instant access to your funds.  

green_tick You would like to make additional deposits to your savings.  

green_tick You would like to open and manage this account online and/or in person from Monmouthshire Building Society Branches.

Not suitable for you if:

File:Cross red circle.svg - Wikimedia Commons You would like a fixed rate of interest on your savings.

File:Cross red circle.svg - Wikimedia Commons You want to open this account over the phone or by post.

Additional Information:

  • Unlimited withdrawals can be made without notice or loss of interest, subject to the minimum balance being maintained 

Click below to expand the Instant Saver Summary Box and Terms and Conditions.

What is the interest rate?
  • The interest rate depends on the balance in the account as set below:
  • 2.70% AER/Gross on balances £15,000 +
    2.45% AER/Gross on balances £1 - £14,999
  • The interest rate is variable, which means the rate can go up or down.
  • Interest is calculated daily and paid once a year after 31 March.
Can Monmouthshire Building Society change the interest rate?
  • Yes, the interest rate is variable.
  • We can change the rate at any time if we feel it’s needed, this is in line with our General Terms and Conditions for Savings Accounts.
  • If we put the rate up, this is shown on our website, and information will be available in our branches and agencies.
  • If we put the rate down, we’ll let you know as soon as we can - with at least 14 days' notice.
What would the estimated balance after 12 months based on a £1,000 and a £15,000 deposit?
  • £15,000 at 2.70% = £15,405.00
    £1,000 at 2.45% = £1,024.50
  • Based on £1,000 or £15,000 being paid into the account, the interest rate doesn’t change and there is no other money into or out of the account over 12 months.
How do I open and manage my account?

Who can open

  • You must be aged 16 or over.
  • You must be a UK resident (excluding Northern Ireland).

How to open

  • Online
  • Branch or agency
  • Via the App

Minimum

  • The minimum balance is £1, and your account needs to stay above this amount.

Maximum

  • The maximum that a member can invest with Monmouthshire Building Society across all accounts is £2,000,000.

How to manage

  • Online (my accounts for existing users), in branch or agency or via the MonBS app.
  • You can pay money into your account whenever you want, up to the maximum balance.
Can I withdraw money?
  • Yes, you can take out your money immediately or close your account without giving notice.
Additional Information
  • The gross rate means before tax.
  • You only pay tax on savings above your Personal Savings Allowance. Visit www.hmrc.gov.uk for more information.
  • AER is the Annual Equivalent Rate and shows what the rate would be if interest was paid and added on each year.
  • Rates and information correct from the 12 September 2025.

The information provided in the summary box is a summary of the key features of the Instant Saver and is not intended to be a substitute for reading the terms and conditions above that apply to the account.


Next Steps

If you have read and understood all the information provided, and you would like to apply for an Instant Saver simply click below.

Alternatively, you can visit one of our branches or agencies in person. 

Apply Online

FAQs

An instant access saver is a variable-rate savings account that lets you pay in and withdraw whenever you like without notice.

You must be 16 or over and a UK resident (excluding Northern Ireland). The instant access saver can be opened in sole or joint names.

You can open and manage the instant access saver online, on our app, or in a MonBS branch or agency. (Telephone or postal opening isn’t available for this account.)

Yes. The instant access saver allows unlimited, penalty-free withdrawals without notice, as long as the £1 minimum balance is maintained.

Yes. Eligible deposits in our Instant Access Saver are protected by the Financial Services Compensation Scheme (FSCS) up to £120,000 per person. This gives our building society savers peace of mind that their money is protected.

For an instant access saver, Interest is shown as AER (Annual Equivalent Rate) which describes what the interest rate would be if interest was paid and compounded once each year, so you can compare accounts fairly.

Yes - by design, an instant access saver is ideal for short-term goals and rainy-day funds because you can withdraw at any time without notice.

If you need rate certainty and no access to your money for a certain period of time, a fixed-rate bond or ISA may suit you better. Choose the instant access saver if flexibility and access are your priorities.

The instant access saver has a minimum balance of £1 and a maximum balance of £2,000,000 (across all products). You can add funds whenever you like and make unlimited withdrawals (keeping at least £1 in the account).

FSCS Protected