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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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App Exclusive 1 Year Fixed Rate
Cash ISA

Issue 1


Interest Rate AER / Tax Free - Fixed : 4.00%

Minimum - Maximum Balance : £1,000 to £20,000.

Open your account : Via the app.

Manage your account: Via the app, Online (my accounts), or in branch or agency.

You must be:

  • At least 18 years old.
  • A UK resident (excluding Northern Ireland).

May be suitable for you if: 

green_tick You would like to invest a lump sum for 1 Year.

You do not need access to your money for 1 Year.

You have £1,000 available to open the account. 

You would like to open and manage this account digitally via the app.

Not Suitable for you if:

red_cross You would like to make an ISA transfer into this account. 

red_cross You would need access your funds within the fixed period.

red_cross You would like to open this account in branch or agency, online, over the phone or by post.

Additional Information :

  • This account only allows the deposit of new ISA funds. ISA transfers are not permitted.
  • Accounts can be held in sole name only.
  • You can pay money into your account up to the maximum ISA allowance of £20,000 for current tax year 2025/26.
  • You can pay money into your account within the first 30 days of opening, up to the maximum balance.
  • There is a 14 day cancellation period.
  • Full closure, including transfer to another ISA provider, will be allowed subject to 90 days’ loss of interest, calculated on the closing balance.

Click below to expand the App Exclusive 1 Year Fixed Rate Cash ISA Summary Box and Terms and Conditions.

What is the interest rate?
  • 4.00% AER / Tax-free 
  • The interest rate is fixed for 1 year and is paid tax-free.
  • Interest is calculated daily and paid at the end of the fixed term.
Can Monmouthshire Building Society change the interest rate?
  • No
  • The interest rate is fixed, so we can’t change it during the term.
What would the estimated balance after 12 months based on £1,000 deposit?
  • £1,040.00
  • Based on £1,000 being paid into the account, and there is no other money into the account over 12 months.
How do I open and manage my account?

Who can open

  • You must be aged 18 or over.
  • You must be a UK resident (excluding Northern Ireland).

How to open

  • Via the app
  • This account only allows the deposit of new ISA funds. ISA transfers are not permitted.

Minimum

  • The minimum balance is £1,000.

Maximum

  • You can pay money into your account up to the maximum ISA allowance of £20,000 for current tax year 2025/26. 

How to manage

  • Via the app, Online (my accounts), or in branch or agency.
  • You can pay money into your account within the first 30 days of opening, up to the maximum balance.
Can I withdraw money?
  • No, after the 14 days ‘cooling off period’, you can’t take money out of your account until the end of the 
    fixed term.
  • If you close or transfer your ISA to another provider, you will be charged 90 days loss of interest on your final 
    balance.
  • We will contact you before the fixed term is due to end to let you know the options that are available. 
  • If you have not notified us of your decision before the end date the account will revert to the Society’s Easy ISA or the nearest equivalent available at that time.
Additional Information *
  • Accounts can be opened for individuals only.
  • You can pay into multiple cash ISAs in the same tax year, up to the overall ISA allowance of £20,000.
  • The tax-free rate means that interest is exempt from income tax.
  • The tax advantages depend on your individual circumstances and the tax treatment of your ISA may change in the future. 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 10 February 2026.

It is important that you read the following before deciding to open an account:

Fixed Rate ISA Terms and Conditions

App Exclusive 1 Year Fixed Rate Cash ISA Summary Box

Other Important Information:

FSCS Information Sheet

General Terms and Conditions for Savings Accounts

Savings Service Tariff

Important Information About Your Personal Data

My Accounts Terms and Conditions

Savings terms:

AER stands for Annual Equivalent Rate and shows what the interest rate would be if interest were paid and added to your account each year.

Gross is the rate of interest payable before any tax is taken off.

Fixed interest means the rate stays the same until the account matures.

Variable interest means the rate can go up or down at any time. We will always publish our rate changes and give you with at least 30 days notice if the rate on one of your accounts is due to go down.

Tax-free means you will not pay any tax on your interest.

Tax year runs from 6 April to 5 April.

Business day is Monday to Friday excluding bank holidays.

 

The information provided in the summary box is a summary of the key features of the App Exclusive 1 Year Fixed Rate Cash ISA 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 App Exclusive 1 Year Fixed Rate ISA simply click below. 

MonBS App

 

FSCS Protected