Cash ISA

Ulster Bank Cash ISA Review

An instant access cash ISA from Ulster Bank. It ranks 120th of 132 instant access cash ISAs we track.

Variable rate

1.15%AER

Up to 2.45% on some tiers

Rate checked Oct 2026Got this account? Leave a review

Protection

FSCS£120,000

Min balance

£1

Max balance

£20,000

Access

Instant

Interest paid

Annually

Transfers in

Accepted

Rate Tiers

£1 – £24,999

1.15%AER

£25,000+

2.45%AER

How It Stacks Up

Ranks 120th of 132

Instant access cash ISAs we track

Well below average
This account 1.15%
UK CPI (Aug 2026)
3.10%
Pays 1.95% less
Average instant access cash ISA
2.93%
Pays 1.78% less
Best instant access cash ISA
4.87%
Pays 3.72% less

Inflation: ONS. Averages and best rates: accounts on DepositScout.

A better-paying alternative

Trading 212 bank logo

Trading 212

Cash ISA

4.80%

AER

  • Pays 3.65% more than this Ulster Bank account
  • Includes a 1.20% bonus for 12 months, then 3.60%
Compare Cash ISAs

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A Good Fit For

  • Pro: New and existing savers
  • Pro: Savers who want instant access

Worth Weighing Up

  • Con: The rate is variable, so it can go down

Please verify all details with the provider – see our Disclaimer

See all Ulster Bank accounts

Estimated returns with Ulster Bank's Cash ISA

What you could earn with Ulster Bank's Cash ISA.

Estimated interest

£1,000 saved

£11.50

At 1.15% AER

£5,000 saved

£57.50

At 1.15% AER

£10,000 saved

£115

At 1.15% AER

£20,000 saved

£230

At 1.15% AER

Estimated over one year, if the rate stays the same and interest is left in. Amounts outside the account's minimum or maximum aren't shown.

Our Expert Opinion on Ulster Bank Cash ISA

Jonny PeaseCo-Founder, DepositScout

Ulster Bank's Cash ISA pays 1.15% on balances up to £24,999, which is below the market average for Cash ISAs and 4.10% behind the category leader at 5.25%. The rate also sits 1.95% below CPI inflation of 3.1%, meaning your money is losing real purchasing power. There is a quirk worth noting: if you can keep £25,000 or more in the account the rate jumps to 2.45%, though the annual ISA allowance cap means most savers will be stuck in the lower tier. If instant access is what you need, Monzo's Instant Access Cash ISA at 2.75% is worth a look instead.

Compare Cash ISAs

2 alternatives to Ulster Bank's Cash ISA

Same type of account, closest on rate.

Common questions about the Cash ISA

D

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