Coventry Building Society Fixed Rate ISA 31.12.2029 Review

A three-year cash ISA from Coventry Building Society. It ranks 24th of 28 three-year cash ISAs we track.

Fixed rate · 38 months

4.20%AER

Protection

FSCS£120,000

Min balance

£1

Max balance

£20,000

Access

31.12.2029

Interest paid

Monthly/Annually

Transfers in

Accepted

How It Stacks Up

Ranks 24th of 28

3-year cash ISAs we track

Below average
This account 4.20%
UK CPI (Aug 2026)
3.10%
Pays 1.10% more
Average 3-year cash ISA
4.62%
Pays 0.42% less
Best 3-year cash ISA
5.11%
Pays 0.91% less

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

Compare cash ISAs

How Interest Is Paid

You choose how often interest is paid: annually or monthly. You earn the same 4.20% AER either way.

Paid annually

4.20%AER

Paid monthly

4.12%gross

The monthly rate is a little lower because interest reaches you sooner. Over a year it adds up to the same.

A Good Fit For

  • Pro: New and existing savers
  • Pro: Savers who want a monthly income

Worth Weighing Up

  • Con: Not flexible: money you withdraw can't be replaced without using more allowance

Good to Know

No partial withdrawals permitted after the 14-day cancellation period; early closure or ISA transfer before maturity incurs a charge equivalent to 270 days' interest.

Please verify all details with the provider – see our Disclaimer

See all Coventry Building Society accounts

Estimated returns with Coventry Building Society's Cash ISA

What you could earn with Coventry Building Society's Fixed Rate ISA 31.12.2029.

Estimated interest

£1,000 saved

£139

At 4.2% AER

£5,000 saved

£696

At 4.2% AER

£10,000 saved

£1,392

At 4.2% AER

£20,000 saved

£2,783

At 4.2% AER

Estimated over the 38-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 Coventry Building Society Fixed Rate ISA 31.12.2029

Jonny PeaseCo-Founder, DepositScout

Coventry Building Society's Fixed Rate ISA 31.12.2029 pays 4.20% AER, which beats August 2026 CPI of 3.1% by 1.10%, but it sits below the cash ISA market average and 0.92% behind the current market leader at 5.12%. The annual interest option pays 4.20% tax-free, while the monthly option pays a slightly lower 4.12% tax-free. The real catch here is that your money is locked until 31 December 2029 with no access before then, and the maximum you can hold is £20,000. If you want a fixed ISA but prefer a shorter commitment, Kent Reliance's three-year fixed rate cash ISA is currently paying 4.97%.

Compare Cash ISAs

2 alternatives to Coventry Building Society's Fixed Rate ISA 31.12.2029

Same type of account, closest on rate.

Common questions about the Fixed Rate ISA 31.12.2029

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