What interest rate does the Paragon Bank 3 Year Fixed Rate Cash ISA pay?

The Paragon Bank 3 Year Fixed Rate Cash ISA pays 4.20% AER fixed.

How much interest could I earn?

Saving £10,000 for 3 years would earn about £1,314 at 4.20% 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.

When is interest paid?

You can choose to have interest paid monthly, annually or on each anniversary of opening.

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 three-year cash ISAs?

At 4.20% AER it ranks 24th of 28 three-year cash ISAs we track. The best pays 5.11% and the average is 4.61%.

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Cash ISA

Paragon Bank 3 Year Fixed Rate Cash ISA Review

A three-year cash ISA from Paragon Bank. It ranks 24th of 28 three-year cash ISAs we track.

Rate checked Oct 2026Got this account? Leave a review

Fixed rate · 3 years

4.20%AER

Rate checked Oct 2026Got this account? Leave a review

Protection

FSCS£120,000

Min balance

£500

Max balance

No limit

Term

3 Years

Interest paid

Monthly/Annually/Anniversary

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: 4.61%; Pays 0.41% less
Best 3-year cash ISA: 5.11%; Pays 0.91% 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

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Estimated returns with Paragon Bank's Cash ISA

What you could earn with Paragon Bank's 3 Year Fixed Rate Cash ISA.

Estimated interest

£1,000 saved

£131

At 4.2% AER

£5,000 saved

£657

At 4.2% AER

£10,000 saved

£1,314

At 4.2% AER

£50,000 saved

£6,568

At 4.2% AER

Estimated over the 36-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 Paragon Bank 3 Year Fixed Rate Cash ISA

Jonny PeaseCo-Founder, DepositScout

Paragon's 3 Year Fixed Rate Cash ISA pays 4.20%, which beats August 2026 CPI of 3.1% by 1.10%, so your money does grow in real terms. That said, 4.20% sits below the cash ISA market average and is 0.92% behind the market leader at 5.12%, so it is not a standout rate. The obvious catch is that your money is locked away for three years with no access. You need at least £500 to open it, and transfers in are accepted, which is useful if you have existing ISA cash to consolidate.

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