What interest rate does the Suffolk Building Society 2 Year Fixed Rate ISA pay?

The Suffolk Building Society 2 Year Fixed Rate ISA pays 4.40% AER fixed.

How much interest could I earn?

Saving £10,000 for 2 years would earn about £899 at 4.40% 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 £1,000 and up to £500,000.

Can I withdraw my money?

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

When is interest paid?

Interest is paid annually or monthly.

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 two-year cash ISAs?

At 4.40% AER it ranks 26th of 44 two-year cash ISAs we track. The best pays 5.05% and the average is 4.50%.

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Cash ISA

Suffolk Building Society 2 Year Fixed Rate ISA Review

A two-year cash ISA from Suffolk Building Society, with a £1,000 minimum deposit. It ranks 26th of 44 two-year cash ISAs we track.

Rate checked Oct 2026Got this account? Leave a review

Fixed rate · 2 years

4.40%AER

Rate checked Oct 2026Got this account? Leave a review

Protection

FSCS£120,000

Min balance

£1,000

Max balance

£500,000

Access

At maturity only

Interest paid

Annually or Monthly

Transfers in

Accepted

How It Stacks Up

Ranks 26th of 44

2-year cash ISAs we track

Below average

This account 4.40%

UK CPI (Aug 2026): 3.10%; Pays 1.30% more
Average 2-year cash ISA: 4.50%; Pays 0.10% less
Best 2-year cash ISA: 5.05%; Pays 0.65% less

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

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A Good Fit For

Pro: Savers who want a monthly income

Worth Weighing Up

Con: Your money is locked in for 2 years
Con: You need at least £1,000 to open it

Good to Know

Also available to open and manage online.

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Estimated returns with Suffolk Building Society's Cash ISA

What you could earn with Suffolk Building Society's 2 Year Fixed Rate ISA.

Estimated interest

£1,000 saved

£89.94

At 4.4% AER

£5,000 saved

£450

At 4.4% AER

£10,000 saved

£899

At 4.4% AER

£500,000 saved

£44,968

At 4.4% AER

Estimated over the 24-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 Suffolk Building Society 2 Year Fixed Rate ISA

Jan WatermannCo-Founder, DepositScout

Suffolk Building Society's 2 Year Fixed Rate ISA pays 4.40%, which is 1.30% above CPI inflation of 3.1%, so your money does at least grow in real terms over the two-year term. That said, at 0.72% below the Cash ISA market leader's 5.12%, this sits below the market average and is hard to recommend on rate alone. The real catch is the complete lack of access until maturity, so only commit money you genuinely will not need for two years. If flexibility matters, the HL Cash ISA at 4.52% is worth a look as an alternative.

Compare Cash ISAs