Cash ISA

Vernon Building Society Fixed-Rate ISA Review

An 18-month cash ISA from Vernon Building Society, with a £5,000 minimum deposit. It ranks 2nd of 4 18-month cash ISAs we track.

Fixed rate · 21 months

4.20%AER

Rate checked Oct 2026Got this account? Leave a review

Protection

FSCS£120,000

Min balance

£5,000

Max balance

No limit

Access

Not permitted

Interest paid

Annually

Transfers in

Accepted

How It Stacks Up

Ranks 2nd of 4

18-month cash ISAs we track

Just below average
This account 4.20%
UK CPI (Aug 2026)
3.10%
Pays 1.10% more
Average 18-month cash ISA
4.30%
Pays 0.10% less
Best 18-month cash ISA
4.60%
Pays 0.40% less

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

Compare cash ISAs

Pros and cons

  • Pro: New and existing savers
  • Con: You need at least £5,000 to open it

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Estimated returns with Vernon Building Society's Cash ISA

What you could earn with Vernon Building Society's Fixed-Rate ISA.

Estimated interest

£5,000 saved

£373

At 4.2% AER

£10,000 saved

£747

At 4.2% AER

£50,000 saved

£3,733

At 4.2% AER

Estimated over the 21-month term, 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 Vernon Building Society Fixed-Rate ISA

Jonny PeaseCo-Founder, DepositScout

Vernon Building Society's Fixed-Rate ISA pays 4.20% until 31 July 2028, which does at least beat August 2026 CPI of 3.1% by 1.10%, so your money holds real value over the term. That said, the rate sits below the Cash ISA market average and is 0.92% behind the current market leader at 5.12%, so you are giving up meaningful ground. The real catch is that access is not permitted, meaning your money is locked until July 2028 with no withdrawals. You need at least £5,000 to open it, and if flexibility matters, the Kent Reliance Easy Access Cash ISA offers 4.24% without the lock-in.

Compare Cash ISAs

2 alternatives to Vernon Building Society's Fixed-Rate ISA

Same type of account, closest on rate.

Common questions about the Fixed-Rate ISA

D

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Nationwide FlexSaver Rate Down
4.20% AER
4.75%
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