What interest rate does the Santander 1 Year Fixed Rate ISA pay?

The Santander 1 Year Fixed Rate ISA pays 4.65% AER fixed.

How much interest could I earn?

Saving £10,000 for 1 year would earn about £465 at 4.65% AER. This assumes the rate stays the same and interest stays in the account.

How much can I pay in?

You can deposit at least £500 and up to £2,000,000.

Can I withdraw my money?

No. Withdrawals aren't allowed until the account matures.

When is interest paid?

You can choose to have interest paid annually or at the end of the term.

Who can open this account?

New and existing Santander customers can open it. You can open it online, in branch or by phone.

Is my money protected?

Yes. Eligible deposits are protected by the Financial Services Compensation Scheme (FSCS) up to £120,000 per person, per banking licence.

Can I transfer an existing ISA in?

Yes, transfers in from other ISAs are accepted.

How does it compare with other one-year cash ISAs?

At 4.65% AER it ranks 17th of 47 one-year cash ISAs we track. The best pays 4.92% and the average is 4.37%.

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Cash ISA

Santander 1 Year Fixed Rate ISA Review

A competitive one-year cash ISA from Santander. It ranks 17th of 47 one-year cash ISAs we track.

Rate checked Oct 2026Got this account? Leave a review

Fixed rate · 1 year

4.65%AER

Rate checked Oct 2026Got this account? Leave a review

Protection

FSCS£120,000

Min balance

£500

Max balance

£2,000,000

Access

At maturity only

Interest paid

Annually/On maturity

Transfers in

Accepted

Santander is also paying £240 to switch your current account. Offer ends 7 October 2026.

See the switch offer

How It Stacks Up

Ranks 17th of 47

1-year cash ISAs we track

Above average

This account 4.65%

UK CPI (Aug 2026): 3.10%; Pays 1.55% more
Average 1-year cash ISA: 4.37%; Pays 0.28% more
Best 1-year cash ISA: 4.92%; Pays 0.27% less

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

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A Good Fit For

Pro: New and existing savers

Worth Weighing Up

Con: Your money is locked in for 1 year
Con: Not flexible: money you withdraw can't be replaced without using more allowance

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Estimated returns with Santander's Cash ISA

What you could earn with Santander's 1 Year Fixed Rate ISA.

Estimated interest

£1,000 saved

£46.50

At 4.65% AER

£5,000 saved

£232

At 4.65% AER

£10,000 saved

£465

At 4.65% AER

£2,000,000 saved

£93,000

At 4.65% 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 Santander 1 Year Fixed Rate ISA

Jan WatermannCo-Founder, DepositScout

Santander's 1 Year Fixed Rate ISA pays 4.65%, which sits near the market average for cash ISAs but is 0.47% behind the category leader at 5.12%. It accepts ISA transfers in and works for anyone with at least £500 to lock away, including existing Santander customers. The real catch is that there is no access until maturity, so this suits money you are confident you will not need for a year. At 1.55% above August 2026 CPI of 3.1%, it does at least beat inflation in real terms.

Compare Cash ISAs