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Cash ISA

OakNorth Cash ISA

OakNorth offers two Cash ISAs: a fixed-rate ISA over terms from one to three years, and an easy-access ISA. Neither is a flexible ISA, and because OakNorth has no current account both have to be funded from a bank account you already hold elsewhere.

Last updated: 21 September 2026

At a glance

2 ISAs covered

  • Fixed-rate and easy-access Cash ISAs
  • Transfers in accepted from other providers
  • Not a flexible ISA
See the rates

The accounts

OakNorth Cash ISAs

Rates and terms as published by OakNorth and read on 21 September 2026. Confirm anything that affects your decision on the provider's own page before you apply.

Fixed Rate Cash ISA

OakNorth logo

3.30%–4.74% AER by term (12-month 4.74%, 24-month 4.55%, 36-month 3.30%)

Rate type
Fixed for the term — OakNorth cannot change it
Access
12 to 36 months
Minimum
£1 to keep the account open
Withdrawals
Allowed, but an early withdrawal carries a charge that depends on the term chosen

Easy Access Cash ISA

OakNorth logo

2.75% AER / 2.72% gross

Rate type
Variable — at least 14 days' notice before a decrease
Access
Next-day access
Minimum
£1 to open, £1 minimum withdrawal
Withdrawals
Unlimited, but withdrawn money cannot be replaced

The rules

Eligibility, transfers and protection

Who can apply
UK residents aged 18 or over
Funding
From a personal UK bank or building society account in your own name — OakNorth has no current account
Transfers in
Accepted from other Cash ISA providers, electronically, and only from the providers listed in OakNorth's online application
Flexible ISA
No — money withdrawn cannot be paid back in
Deposit protection
FSCS protected up to £120,000
Interest
Calculated on the minimum daily balance and applied monthly

Before you commit an allowance

What to check first

  • Neither ISA is flexible. Take £5,000 out and you lose £5,000 of that year's allowance permanently — a real difference from providers whose ISAs let you replace withdrawals in the same tax year.
  • You have 30 calendar days from approval to fund the account. Miss that and the account expires and is closed.
  • On the Fixed Rate Cash ISA you can only pay in during those first 30 days. After the window closes, no further deposits are allowed for the rest of the term.
  • OakNorth accepts deposits well above the FSCS limit across its accounts, so a large balance means choosing rate over protection on the excess.
  • ISA transfers must be arranged through OakNorth's own application, not by moving the money yourself — withdrawing it first would lose its tax-free status.
  • OakNorth's wider savings hub currently shows 4.77% for the 12-month fixed ISA while the dedicated product page shows 4.74%. This page uses the dedicated product rate and flags the discrepancy.

A Cash ISA allowance is annual and does not roll over. Read how the providers compare before committing it to one bank.

Comparing OakNorth'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.

Compare Cash ISAsOakNorth review