Enjoy the freedom of spreading out your tax-free savings allowance
With CustomISA you can spread your annual tax-free allowance across as many Newcastle Building Society ISAs as you like, to meet your individual savings goals.
To make the most of your 2025/2026 ISA subscription:
- You will need to have successfully opened your ISA and we will need to receive your funds by 11:59pm on April 5th 2026.
- Any ID or residency documents that we may request must be received by March 26th 2026.
- If your application fails after March 26th 2026, you can still proceed with opening your account and your funds will be applied to your 2026/2027 ISA subscription.
How does CustomISA benefit me?
- CustomISA helps you to make the most of your cash ISA allowance by creating a package of accounts to suit your needs.
- It's ideal for those who would like a savings plan that is more tailored, based on the length of a product or access.
How does CustomISA work?
Each year you're allowed to save a certain amount of money into an ISA (Individual Savings Account) without having to pay any tax on the interest you earn. The allowance for the tax year 2025/2026 is £20,000.
CustomISA lets you spread your allowance across several tax-free accounts ranging from easy access and fixed term accounts to meet your individual savings goals.
Create your own CustomISA
In order to help you choose what ISAs suit your needs we have developed our CustomISA calculator.
The CustomISA calculator allows you to compare and change the amounts you put into each account to help you find the perfect CustomISA for you.
With the CustomISA calculator, you can:
- View and select from our range of ISAs
- See the average interest rate that can be achieved over your choice of ISAs
- Email / print a copy for your records
Find the perfect CustomISA to suit you
Compare and change the amounts you put into each account to help you find the perfect CustomISA.
Ready to apply?
Once you’ve created a CustomISA package you are happy with, you can apply for your ISAs in a number of ways:
You can apply online by following the steps below:
- Apply for the first of your chosen ISAs using our online application process, making sure you make a note of your online log in details.
- Once your account is open, log into your account online and click on the ‘open another account’ tab. This will allow you to open further ISAs up to your maximum ISA allowance. You can also transfer ISAs from other providers.
- Once all of your ISAs are open you can view your ‘CustomISA Summary’ online to see how your own unique ISA package is split.
If you would like to discuss CustomISA face-to-face, our friendly staff will be able to talk you through our CustomISA calculator and assist you in creating your own package of ISAs. Visit your local branch for further information or book a branch appointment.
Need some help?
Our lines are open Monday to Friday from 8am - 6pm. We're closed on bank holidays.
*Calls to 0345 numbers cost the same as a call to a standard ‘01’ or ‘02’ landline number, even when calling from a mobile. Calls from landlines and mobiles are included in any bundled minutes or free call packages. The actual cost you are charged will depend on your landline or mobile provider. Please contact them to get information about the cost of the call. We may monitor and record telephone calls for training and security purposes.