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Ecology Building Society

Ecology Building Society Ecology Cash ISA

The money you save in Ecology Building Society's Ecology Cash ISA Account is used to support properties and projects that benefit the environment.


Your savings earn you interest, and make you a member, giving you a say in how Ecology is run.

The Ecology Cash ISA allows you to invest your money in a tax-efficient way while simultaneously seeking to protect the environment and avoid funding unethical practices.


Investment product type


An ISA is an Individual Savings Account that allows you to protect your savings options from Income Tax and Capital Gains Tax.

The cash ISA, is suitable for short-term savings as your money is easily accessible.

Financial return

Interest rate policy

Ecology aims to offer savings interest rates that give good value for the long term. All Ecology savings products featured on the Ethex platform are available to both new and existing members and the Society does not use introductory or bonus rates. Ecology pays interest on all balances, however low, and pays interest on funds from the day of receipt.

Interest rates

Variable interest rate of 0.60% gross* p.a./AER

Investments made on Ethex don’t just offer the prospect of a financial return. We analyse and report on the social performance of each investment, to reveal the social return your money delivers. Read more

Social return
In 2018 Ecology Building Society's lending – a key social return indicator - was £38.4 m. Read more

How interest is paid

Interest can be paid away or compounded

Why invest in Ecology Building Society?

A simple and light urban Passivhaus

Jenny’s story
Jenny’s story

Jenny wanted a self-built home that was simple and beautiful, with high ceilings and flooded with light. She also wanted to create a low-energy and low-tech build, constructed from sustainable, locally sourced materials. With the support of an Ecology mortgage, Jenny achieved this and more; her home also received Passivhaus certification – widely considered the gold standard in energy efficiency Read more

Minimum investment amount

 £25 per month

Maximum investment amount

The current maximum that can be put into any one ISA in a tax-year is £20,000

Getting your money back

No-notice withdrawals; however, if a withdrawal is made, the value may only be replaced by further subscriptions where the annual investment limit for the relevant tax year has not been reached.

How secure is your money?

Ecology Building Society's Foundations Cash ISA is covered by the Financial Services Compensation Scheme (FSCS). The FSCS can pay compensation to shareholders and depositors if the Society is unable to meet its financial obligations. Most individuals and businesses are covered by the scheme. More details

An eligible shareholder/depositor is entitled to claim up to £85,000 in total across all Ecology accounts. 

Keeping track of your investments

Access to your account is by post. You can also view your savings account online at any time by registering for the Ecology Interactive service.

Ecology will send you an annual statement every January, as well as a regular newsletter highlighting some of the projects your money supports. As a member, you can also attend the annual general meeting.

Tax considerations

All ISA interest is paid tax-free, which means it’s exempt from income tax and no tax is deducted. It’s your responsibility to pay any tax due, based on your individual circumstances. Tax rules may change in future

Voting rights

This investment entitles you to one vote in Ecology Building Society, so long as you are a share holding member aged 18 or over on the date of voting and have remained so between the dates specified, and your account balance at the end of the previous financial year (or other dates as specified in the Rules) was more than £100.


You must be aged 16 years or over. You must be resident in the United Kingdom for tax purposes or, if not, a Crown employee serving overseas, or married to/in a civil partnership with a Crown employee serving overseas. If you invest in this cash ISA, you must not invest in another cash ISA in the same tax year.


 This product can only be opened via post. It can be operated via internet and post.


 Ecology Building Society is not accepting transfers-in for this ISA product.

Open this account

This account can only be opened by post.

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