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Hart 1 Year Fixed Rate Cash ISA (Issue 1)

4.12%
Tax-free | PA / AER | Fixed

Explore Harpenden Building Society’s Hart 1 Year Fixed Rate Cash ISA account for our local community available to those living at a residential address with an AL, HP, LU or WD postcode

Deposit Calculator

What could you get?

The estimated interest is for illustrative purposes only and assumes your savings are paid in on the 1st January and no further deposits or withdrawals are made. It doesn’t consider any individual circumstances. All interest rate information should be read in conjunction with the full product information and general terms and conditions for savings accounts. For products with a tiered interest rate – the calculation displayed is based solely on the highest interest rate available shown within the product. Please refer to the individual product terms and conditions for full details regarding tiered interest rates and withdrawals.

This account is for you if:

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You want to save your money and keep all the interest or returns tax‑free, without worrying about paying tax on what you earn

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You want to make the most of your £20,000 annual ISA allowance and understand the importance of using it before the tax year ends

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You’re planning ahead and want a simple, tax‑efficient way to build savings year after year, knowing you receive a new ISA allowance every tax year

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You live at a residential address with an AL, HP, LU or WD postcode

Summary Box

This product is only available to those living at a residential address with an AL, HP, LU or WD postcode.  This account can only be opened in branch or by post. The account can be viewed and managed but not opened through Harpenden Online.

Here’s more information about the product

Hart 1 Year Fixed Rate ISA (Issue 1)

4.12% Tax-free PA/AER* fixed.

Interest is calculated daily and paid once a year on the anniversary of the date your first deposit is made into the account.

* The “Tax-free PA” is the annual rate of interest. Cash ISAs are not subject to the deduction of tax on savings income under current legislation. The annual equivalent rate (AER) is a notional rate which illustrates what the gross interest rate would be if the interest was paid and added to the account annually.

The information contained in this table forms part of the terms and conditions of the account and should be read in conjunction with our Cash ISA Terms and Conditions.

Interested in a Hart 1 Year Fixed Rate Cash ISA (Issue 1) Account?

This product is only available to those living at a residential address with an AL, HP, LU or WD postcode.  Download the application form here.

 

Frequently Asked Questions

Here’s some helpful advice and guidance

A cash ISA allows you to avoid paying tax on a nominal amount of your savings. The amount you can save or invest in an ISA is referred to as the annual allowance. The allowance can change annually and is set by the Government.

You choose how you use your ISA allowance. You can split the amount you save into any combination of ISAs, Cash ISA, Stocks and Shares ISA, Innovative Finance ISA and Lifetime ISA, so long as the amount invested does not exceed the overall annual ISA allowance. Alternatively, you can save the full ISA allowance in a cash ISA.

Your annual allowance is for the whole tax year (6 April one year until 5 April in the following year), but you cannot invest more than the annual allowance in each tax year.

I would like to express how extremely helpful the staff members were on the telephone when dealing with Cash ISA questions, namely Jane, Laura and Catherine. They were all very knowledgeable with an excellent manner, and a credit to Harpenden Building Society which I highly recommend.

Jacqueline

February 2026

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Helpful staff made for a pleasant experience. The account I wanted, which had one of the best interest rates I could find, was easily set up when I called into Harpenden branch. Tabitha was most helpful and it was a relaxed experience in pleasant surroundings.

John G

February 2026

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