Cash ISA

Family Building Society Flexible ISA Review

One of the best-paying instant access cash ISAs, from Family Building Society. It ranks 18th of 134 instant access cash ISAs we track.

Variable rate

4.15%AER

Rate checked Oct 2026Got this account? Leave a review

Protection

FSCS£120,000

Min balance

£500

Max balance

£250,000

Access

Instant

Interest paid

Annually

Transfers in

Accepted

How It Stacks Up

Ranks 18th of 134

Instant access cash ISAs we track

Among the best
This account 4.15%
UK CPI (Aug 2026)
3.10%
Pays 1.05% more
Average instant access cash ISA
2.94%
Pays 1.21% more
Best instant access cash ISA
4.87%
Pays 0.72% less

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

A better-paying alternative

Trading 212 bank logo

Trading 212

Cash ISA

4.83%

AER

  • Pays 0.68% more than this Family Building Society account
  • Includes a 1.23% 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
  • Pro: Flexible: take money out and put it back in the same tax year without using more allowance

Worth Weighing Up

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

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Estimated returns with Family Building Society's Cash ISA

What you could earn with Family Building Society's Flexible ISA.

Estimated interest

£1,000 saved

£41.50

At 4.15% AER

£5,000 saved

£208

At 4.15% AER

£10,000 saved

£415

At 4.15% AER

£250,000 saved

£10,375

At 4.15% 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 Family Building Society Flexible ISA

Jan WatermannCo-Founder, DepositScout

Family Building Society's Flexible ISA pays 4.15%, which is below the market average for cash ISAs and 1.10% behind the category leader at 5.25%. The rate does beat August 2026 CPI of 3.1% by 1.05%, so your money grows in real terms. The genuine catch is the withdrawal limit: up to 12 per calendar year before an access charge applies, so it is not truly unrestricted instant access. If you want a better rate, Kent Reliance's Easy Access Cash ISA pays 4.24% with a £500 minimum.

Compare Cash ISAs

2 alternatives to Family Building Society's Flexible ISA

Same type of account, closest on rate.

Common questions about the Flexible ISA

D

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