Cash ISA

Aldermore 15 Month Fixed Rate Cash ISA Review

A competitive fixed cash ISA from Aldermore, with a £1,000 minimum deposit. It ranks 42nd of 172 fixed cash ISAs we track.

Fixed rate · 15 months

4.85%AER

Rate checked Oct 2026Got this account? Leave a review

Protection

FSCS£120,000

Min balance

£1,000

Max balance

£20,000

Access

15 Months

Interest paid

Monthly/On maturity

Transfers in

Accepted

How It Stacks Up

Ranks 42nd of 172

Fixed cash ISAs we track

Above average
This account 4.85%
UK CPI (Aug 2026)
3.10%
Pays 1.75% more
Average fixed cash ISA
4.53%
Pays 0.32% more
Best fixed cash ISA
5.25%
Pays 0.40% less

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

Compare cash ISAs

A Good Fit For

  • Pro: New and existing savers
  • Pro: Savers who want a monthly income
  • Pro: Flexible: take money out and put it back in the same tax year without using more allowance

Worth Weighing Up

  • Con: You need at least £1,000 to open it

Good to Know

Transfers in only at account opening. Deposits only within 14 days of opening. Early access may incur an interest deduction. Max subscription is the annual ISA allowance.

Please verify all details with the provider – see our Disclaimer

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Estimated returns with Aldermore's Cash ISA

What you could earn with Aldermore's 15 Month Fixed Rate Cash ISA.

Estimated interest

£1,000 saved

£60.99

At 4.85% AER

£5,000 saved

£305

At 4.85% AER

£10,000 saved

£610

At 4.85% AER

£20,000 saved

£1,220

At 4.85% AER

Estimated over the 15-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 Aldermore 15 Month Fixed Rate Cash ISA

Jan WatermannCo-Founder, DepositScout

Aldermore's 15 Month Fixed Rate Cash ISA pays 4.85%, which sits above the cash ISA market average though still 0.40% behind the category leader at 5.25%. At 1.75% above August 2026 CPI of 3.1%, it does deliver a real return. The cap of £20,000 is worth noting, and your money is locked for 15 months with no access. If you want the same 4.85% with a shorter or longer commitment, Tandem Bank's 1 Year Fixed Rate Cash ISA and Hodge Bank's 2 Year Fixed Rate Cash ISA both match it.

Compare Cash ISAs

2 alternatives to Aldermore's 15 Month Fixed Rate Cash ISA

Same type of account, closest on rate.

Common questions about the 15 Month Fixed Rate Cash ISA

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