Whether you’re looking for instant access, annual bonuses or tax-free savings, we have an account that will help you achieve your savings goals.
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Whether you’re looking to buy your first home, move somewhere bigger, or simply get a better deal, we can offer a mortgage that suits you.
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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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We offer a range of Cash ISAs, including a Junior ISA and a Help to Buy: ISA.
Account Name Interest Rate (AER/Tax-free)
3 Year Fixed Rate Cash ISA 1.91%
60 Day Notice Smart Tracker Cash ISA 1.30%
Instant Cash ISA 1.15%
Help to Buy: ISA 2.35%
Junior Cash ISA 2.50%
Inheritance ISA 0.90%


Further information and T&Cs for each of our ISAs can be found by clicking the account name in the table above.

Guide to ISAs
What is an ISA?

ISA stands for Individual Savings Account. It allows your savings to grow tax-efficiently. There are four types of ISA available:

  • Cash ISA
  • Stocks & Shares ISA
  • Innovative Finance ISA
  • Lifetime ISA

Monmouthshire Building Society only offers Cash ISAs.

Can I open a Cash ISA?

You can open a Cash ISA if you are:

  • aged 16 or over, and;
  • resident in the United Kingdom, or perform duties as a crown employee overseas or are in a marriage or civil partnership with such a person.

Accounts can only be opened in a sole name. Joint accounts are not permitted for ISAs.

What are the tax advantages?
  • Any interest on your Cash ISA will be free of personal UK Income Tax and Capital Gains Tax.
  • You are not required to declare any interest on your Cash ISA on your Tax Return.
How much can I save?

The annual subscription limits to ISAs for the current tax year are:

  • Overall maximum investment is £20,000.
  • Investors may subscribe to ONE Cash ISA, ONE Stocks and Shares ISA, ONE Innovative Finance ISA and ONE Lifetime ISA in each tax year.

Investors have additional flexibility in deciding the balance of their investments provided they keep within the £20,000 annual subscription limit. ISA savings can be held in cash, stocks and shares, innovative finance ISA or a lifetime ISA in any combination that the investor wishes.

For example — an investor could subscribe:

  • £20,000 in a Cash ISA, £0 to a Stocks and Shares ISA and £0 to an Innovative Finance ISA and £0 to a Lifetime ISA.
  • £6,000 in a Cash ISA, £5,000 to a Stocks and Shares ISA, £5,000 to an Innovative Finance ISA and £4,000 to a Lifetime ISA.
  • £10,000 in a Cash ISA, £0 in a Innovative Finance ISA, £10,000 to a Stocks and Shares ISA and £0 to a Lifetime ISA.
  • £10,000 in a Cash ISA, £0 to a Stocks and Shares ISA, £10,000 to an Innovative Finance ISA and £0 to a Lifetime ISA.

Lifetime ISA's can be held alongside Cash, Stocks and Shares or Innovative ISA's and contributions will form part of your annual ISA allowance. Lifetime ISA's are subject to certain conditions and are not available through Monmouthshire Building Society. You can put up to £4,000 in a Lifetime ISA each tax year.

How does the Help to Buy: ISA work?

We have a Help to Buy: ISA Guide available here.


More detailed information about ISAs is contained in the ISA Factsheet available from any tax office or online at

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