MaximISA Calculator

Most ISA providers only let you open one cash ISA each tax year, which can restrict your options. With our MaximISA, you can spread your annual £20,000 ISA allowance across our Cash ISA products in the best way to meet your needs. Our easy to use calculator shows you how.

Open an account today

When you’ve decided how you want to split your allowance, simply:

  •  Click on the links above to find out more about your chosen accounts. Please make sure that you have read the product summary box and the Terms and Conditions before you proceed with opening an account. We’ll write to you, usually within five business days, to confirm that your first account is open and to give you your Customer ID
  • Once you've received your Customer ID, log into Internet Banking and open your other chosen accounts by clicking on the ‘Open an account’ link and following the on-screen instructions. As an existing customer, we’ll already have your details so you can usually open other accounts in just a couple of minutes.

Important information about the MaximISA calculator

This calculator is designed for illustrative purposes only. Use of the calculator does not guarantee the opening of an account. The products and interest rates available can change at any time.                                                                                                  

Interest is calculated on the product Annual Rate as shown in the calculator. The calculations assume that no further deposits or withdrawals are made during the product term for the 1, 2 & 3 Year Fixed Rate Cash ISAs and in the first 12 months for the 30 Day Notice Cash ISA. For the 2 & 3 Year Fixed Rate Cash ISAs, the calculations also assume that interest is paid and compounded to the account once each year.

*AER stands for annual equivalent rate and illustrates the interest rate if it was paid and compounded once each year.


We reserve the right to withdraw these products from sale at any time.