1yr Fixed Rate Cash ISA
4.00% AER / 4.00% tax-free
- Rate type
- Fixed throughout the one-year term, interest credited annually
- Access
- One year
- Minimum
- £5,000 opening balance
- Withdrawals
- Check the account terms before applying
Cash ISA
Co-operative Bank Cash ISA
The Co-operative Bank offers fixed-rate Cash ISAs over one and two years, plus lower-paying variable ISAs. The fixed accounts need £5,000 to open, which rules them out for anyone starting small, and interest is credited annually rather than monthly.
Last updated: 9 September 2026
At a glance
3 ISAs covered
- Fixed ISAs over one and two years
- £5,000 minimum to open a fixed ISA
- Published ethical policy
The accounts
Co-operative Bank Cash ISAs
Rates and terms as published by Co-operative Bank and read on 9 September 2026. Confirm anything that affects your decision on the provider's own page before you apply.
2yr Fixed Rate Cash ISA
4.09% AER / 4.09% tax-free
- Rate type
- Fixed throughout the two-year term, interest credited annually
- Access
- Two years
- Minimum
- £5,000 opening balance
- Withdrawals
- Check the account terms before applying
Online Cash ISA
2.00% AER / 2.00% tax-free
- Rate type
- Variable, interest credited annually
- Access
- Online
- Minimum
- £1
- Withdrawals
- Check the account terms before applying
The rules
Eligibility, transfers and protection
- Who can apply
- UK residents; accounts opened online or in branch
- Access
- Online, app, telephone and supported branch routes
- Transfers in
- Accepted from other providers
- Flexible ISA
- Not stated on the rates page — confirm before applying
- Deposit protection
- FSCS protected up to £120,000
- Interest
- Credited annually on both the fixed and Online Cash ISAs
Before you commit an allowance
What to check first
- Both fixed ISAs need £5,000 to open. That is the highest minimum of any Cash ISA on this site and rules them out for a smaller first deposit.
- Interest is credited annually rather than monthly, so it compounds more slowly than accounts paying monthly at the same headline rate.
- The Online Cash ISA pays 2.00%, less than half the fixed rate. The gap between Co-operative Bank's own accounts is unusually wide.
- Co-operative Bank's own ISA product page has previously carried a fixed-rate figure that its rates table contradicted. The interest-rates page is the one to trust — that is the source used here.
- The fixed rates apply to the ISA launched on 25 August 2026, so check you are being offered the current issue.
A Cash ISA allowance is annual and does not roll over. Read how the providers compare before committing it to one bank.
Comparing Co-operative Bank's Cash ISA?
See how it sits against the other UK banks offering a Cash ISA, or read the full review of the bank behind it.