Compare all Cash ISAs

ISA (or Individual Savings Account) is a tax efficient way to save. There are four different types of ISA. At Family Building Society we only offer Cash ISAs.

A Cash ISA pays interest free of income tax. Each tax year, there is an annual allowance for how much you can deposit (across all types of ISAs in total). For adult ISAs, the annual statutory limit is £20,000 for the 2025/2026 tax year. For Junior ISAs, the limit is currently £9,000 per tax year.

We offer different types of Cash ISAs with rates that are fixed and variable, and the rules on how often you can make withdrawals differ per account. Find the right account for you by comparing all our different types of Cash ISA accounts.

From 6 April 2025, you are allowed to open and pay into multiple ISAs of the same type in the same tax year (except for Lifetime and Junior ISAs). Please note that, whilst this means you could open more than one Cash ISA with other providers within the same tax year, we will only allow new subscriptions for this tax year to be made into one ISA held with us.

We have a range of fixed and variable rate Cash ISAs.

Fixed rate account - our fixed rate Cash ISAs have an interest rate which won’t change during the fixed term of the account. Withdrawals are not permitted until the end of the fixed rate period (maturity date), however these accounts can be closed before maturity subject to an Early Access Charge.

Variable rate account – our variable rate Cash ISAs have an interest rate which can change. Regular withdrawals are permitted with these accounts (subject to the terms of the individual account). We have a range of variable rate Cash ISAs:

• 35 Day Notice Cash ISA – This account offers a tiered interest rate, meaning the more you save the higher the interest rate. The account also gives you the flexibility to withdraw and replace money for both current and previous tax years’ allowances. Withdrawals from this account are available without an access charge after 35 days’ notice or without notice subject to the loss of 35 days' interest on the total amount withdrawn.
• Flexible ISA – This account gives you a flexible way to save, giving you the ability to withdraw and replace money without affecting your annual ISA subscription limit. The minimum opening balance is £500 and allows for 12 annual withdrawals per calendar year.
• Cash Junior ISA – This account offers a tiered interest rate, so the more you save the better the return. No withdrawals are allowed, and the account cannot be closed until the account holder turns age 18.

Cash ISAs are a tax efficient way of saving as you don’t pay any income tax on the interest you earn. If your money is not held in an ISA and you exceed your Personals Savings Allowance (link) you will need to pay tax.

Existing ISAs can be transferred between building societies and banks. To switch providers, you will need to contact the ISA provider you wish to move your funds to and fill out their ISA transfer form. The new ISA provider will initiate and manage the transfer process accordingly. If you want to transfer ISA money which you’ve invested in during the current tax year, you must transfer the whole balance. If you want to transfer ISA money that’s been invested in previous years, you can choose to transfer all or part of this value.

Flexible ISAs allow you to withdraw money and replace it without affecting your annual ISA allowance. To benefit from this, any amount you withdraw must be paid back into the Flexible ISA before the end of that tax year (5 April).

The annual ISA allowance will remain as £20,000 for the new tax year beginning on 6 April 2026. Additionally, the Junior Cash ISA allowance will remain at £9,000.

It is quick and easy to open and manage your account with Family Building Society. You may be able to apply online, by post or at our Epsom branch to open one of our Cash ISA accounts below, depending on the product selected.

If you are applying online and are new to Family Building Society, it only takes a few minutes to apply. Please have your National Insurance number to hand.

If you would like to open an ISA with us using money transferred from another ISA provider, please refer to our ISA transfers page.

No, the tax benefits are available to individuals. You and your partner can open your own individual accounts to benefit from the tax savings.

You can transfer a Cash ISA or Junior Cash ISA (subject to the terms and conditions of your account) from another provider into a Family Building Society ISA without losing your tax-free benefits. For full details, including product-specific rules and how to apply, please see our ISA Transfers page.

Please note:

• We accept full transfers only for current tax year subscriptions - partial transfers are not permitted for these. However, partial transfers are allowed for subscriptions from previous tax years
• Transfers from Stocks & Shares ISAs aren't permitted
  
• Please allow up to 15 business days for transfers, in addition to any applicable notice period. A transfer charge may apply.

Yes, if you have a Variable Rate Cash ISA, additions can usually be made anytime (subject to the terms of the individual account). For our Fixed Rate Cash ISAs, additions are allowed for 15 calendar days after the account is opened. After this period no further additions are allowed.

Once you reach the maximum annual ISA allowance (£20,000 per year until April 2027) you will not be able to add any more money into your account until the next tax year. It's important to check the Cash ISA terms and conditions before opening an account.  Your deposits in a Cash ISA with us are protected by the Financial Services Compensation Scheme (FSCS) up to £120,000.

How often you can withdraw from your Cash ISA depends on the account type.

• Fixed Rate Cash ISAs usually restrict withdrawals during the fixed term or may apply an interest penalty.
  
  
• Variable Rate Cash ISAs usually allow regular withdrawals (subject to the terms of the individual account). Unless your ISA is flexible, replacing any lump sum withdrawals will use up more of your annual ISA allowance. For example: if you deposit £15,000 in a Cash ISA during the tax year, but then take out £1,000, you can only add another £5,000 in that current tax year.

Yes, your savings are in safe hands, protected up to a total of £120,000 by the Financial Services Compensation Scheme.

This limit is applied to the total of any deposits you have with the following: Family Building Society and National Counties Building Society. Any total deposits you hold above the limit between these brands are unlikely to be covered.

Learn more about the FSCS.

From 6 April 2024, you are allowed to open and pay into multiple ISAs of the same type in the same tax year (except for Lifetime and Junior ISAs). Please note that, whilst this means you could open more than one Cash ISA with other providers within the same tax year, we will only allow new subscriptions for this tax year to be made into one ISA held with us.

The total value of any new tax year subscriptions invested across all ISAs must not exceed the annual statutory limit for the 2025/2026 tax year, which is £20,000. 

From 6 April 2024, the age you can open an adult Cash ISA has increased from 16 to 18.

If you’re 16 or 17 and already have an adult Cash ISA with us, you can continue to subscribe as per the terms of your ISA, up to the annual statutory limit. You can also transfer an existing cash ISA from another provider. Current tax year subscriptions must be transferred in full, and the account with your other provider closed. Partial transfers of previous years subscriptions are allowed.

Previously 16 and 17 year olds could have both a junior and an adult Cash ISA and subscribe to both until age 18. From 6 April 2024, you can only have and subscribe to one Cash ISA until you’re 18. If you already have both an adult and a junior Cash ISA with us, you can continue to subscribe to one of the ISAs up to the annual statutory limit per tax year (£20,000 for an adult ISA, £9,000 for a junior ISA). If transferring from another provider, any current year’s subscriptions must be transferred in full.

From 6 April 2027, if you are under the age of 65, you will still have the £20,000 ISA allowance. Of this, up to £12,000 can be paid into a Cash ISA, and the remaining £8,000 would need to be invested in a Stocks and Shares ISA to use the full allowance. Savers aged 65 and over can still place the full £20,000 into a Cash ISA if they wish.

Whilst interest rates may vary, banks and building societies both offer these tax-free savings accounts.

The main difference between a bank and a building society is ownership. UK banks are owned by shareholders, shifting their focus towards shareholder profits. Meanwhile as a building society we are owned and run for the benefit of our savings and mortgage Members. As we don't have any shareholders, this means we don't pay dividends. Instead, our profits are put back into the Society, to benefit our Members. Our member-owned structure means our focus is on delivering value to our Members.

It’s important to choose a Cash ISA that suits your needs. You might consider a Variable Rate Cash ISA if you would like greater access to your money, or a Fixed Rate Cash ISA if you prefer the certainty of a guaranteed interest rate for a set period.