Tesco Bank Instant Access Cash ISA Review4.20% AER (Sep 2026)

Cash ISA from Tesco Bank

Already got this account?Leave a review to help other savers

Protection

FSCS

Up to £120,000

Min balance

£1

Max balance

None

Access

Instant

Interest paid

Annually

Transfers in

Accepted

The Rate You'll Get

Learn more about Tesco Bank

First 12 months

Boosted

4.20%

AER

Includes a 3.15% boost for 12 months

Standard rate (after 12 months)

1.05%

AER

Who Is This For

Those wanting easy access

Additional Info

Open online or by phone and manage by Mobile App, Online Banking or phone. Applicants must be aged 18 or over and UK tax resident, a Crown employee serving overseas, or the spouse/civil partner of such an employee; an own-name linked account and Cash ISA declaration are required. The account is sole-name, has no maximum balance, and subscriptions are subject to the £20,000 annual ISA allowance.

Please verify all details with the provider – for more info read our Disclaimer

Estimated returns with Tesco Bank's Cash ISA

Want to know how much interest you will receive with Tesco Bank's Instant Access Cash ISA?

Estimated interest

£1,000 saved

£42.00

At 4.2% AER

£5,000 saved

£210

At 4.2% AER

£10,000 saved

£420

At 4.2% AER

£50,000 saved

£2,100

At 4.2% AER

Estimated over one year, assuming the rate stays the same and interest stays in the account. Amounts outside this account's minimum or maximum balance are left out.

Our Expert Opinion on Tesco Bank Instant Access Cash ISA

The 4.20% rate here is a bonus deal: the base rate is just 1.05% and the 3.15% boost only lasts 12 months from when your opening cohort began on 16 April 2026, so you need to be ready to move your money when that period ends. That said, it suits someone who wants instant access and the ability to transfer existing ISA balances in, and the £1 minimum makes it genuinely open to almost anyone. If you want a clean, non-bonus rate right now, Atom Bank's Easy Access Cash ISA is sitting at 4.25% and worth a look alongside this one.
Jan Watermann (Co-Founder)DepositScout